Featured Articles

Photo by Yichun Zhang
dynamic-tracing
...
openresty-xray bilibili
8 mins read

One String Value Crashed Asia's Biggest Streaming Site — We Found It with OpenResty XRay

One String Value Crashed Asia's Biggest Streaming Site — We Found It with OpenResty XRay

Binary Vulnerability Scanning: Catch Backported Patches, Cut False Positives
security
...
vulnerability openresty-xray cve
10 mins read

Binary Vulnerability Scanning: Catch Backported Patches, Cut False Positives

Binary Vulnerability Scanning: Catch Backported Patches, Cut False Positives

Introduction to OpenResty XRay
openresty-xray
...
nginx
6 mins read

Introduction to OpenResty XRay

Introduction to OpenResty XRay

Anatomy of a 15x Performance Drop: A 90k to 6k QPS Root Cause Analysis with OpenResty XRay
openresty-xray
...
casestudy lua nginx off-cpu
3 mins read

Anatomy of a 15x Performance Drop: A 90k to 6k QPS Root Cause Analysis with OpenResty XRay

Anatomy of a 15x Performance Drop: A 90k to 6k QPS Root Cause Analysis with OpenResty XRay

Non-Invasive Java Profiler: Capture Method Arguments in Production Without a Java Agent
openresty-xray
...
java probe
4 mins read

Non-Invasive Java Profiler: Capture Method Arguments in Production Without a Java Agent

Non-Invasive Java Profiler: Capture Method Arguments in Production Without a Java Agent

Photo by Philip Brown
dynamic-tracing
...
openresty-xray
26 mins read

The Wonderland of Dynamic Tracing (Part 1 of 3)

The Wonderland of Dynamic Tracing (Part 1 of 3)

Photo by Jose G. Ortega Castro
nginx
...
openresty memory openresty-xray dynamic-tracing
13 mins read

How OpenResty and Nginx Shared Memory Zones Consume RAM

How OpenResty and Nginx Shared Memory Zones Consume RAM

Photo by Harrison Broadbent
nginx
...
openresty memory luajit openresty-xray dynamic-tracing
13 mins read

Nginx Memory Usage Explained: Where the RAM Actually Goes

Nginx Memory Usage Explained: Where the RAM Actually Goes

OpenResty XRay reduce your CPU usage up to  90%
OpenResty XRay reduce your CPU usage up to 90%
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Latest Articles

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 5 mins read

Self-Optimization: The Performance Evolution of OpenResty XRay

tutorial openresty-xray
  • Challenges and Pain Points
  • OpenResty XRay’s Self-Analysis Process
  • Remarkable Optimization Results
  • Technical Insights and Business Value
  • Conclusion
  • Challenges and Pain Points
  • OpenResty XRay’s Self-Analysis Process
  • Remarkable Optimization Results
  • Technical Insights and Business Value
  • Conclusion

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 4 mins read

Case Study: OpenResty XRay Doubles Ylang Compiler Performance

tutorial ylang openresty-xray analyzer
  • Case Study: OpenResty XRay Doubles Ylang Compiler Performance
  • Significant Optimization Results
  • Ylang Language: The Ideal Tool for Dynamic Tracing
  • A Model of Technical Synergy
  • Further Reading
  • Case Study: OpenResty XRay Doubles Ylang Compiler Performance
  • Significant Optimization Results
  • Ylang Language: The Ideal Tool for Dynamic Tracing
  • A Model of Technical Synergy
  • Further Reading

OpenResty XRay Jul 22, 2026

OpenResty XRay Updated Jul 22, 2026 8 mins read

Java Tomcat Slow Response Time: Pinpoint the Exact Slow Request with PCAP

openresty-xray java tomcat latency performance
  • Diagnose Tomcat slow response time by catching the exact slow request
  • Selective packet capture: filter by duration, status, and path
  • Per-request PCAP download for one specific slow request
  • Tell server-side latency from network delay
  • Works for Spring Boot apps with embedded Tomcat
Photo by Yichun Zhang
  • Diagnose Tomcat slow response time by catching the exact slow request
  • Selective packet capture: filter by duration, status, and path
  • Per-request PCAP download for one specific slow request
  • Tell server-side latency from network delay
  • Works for Spring Boot apps with embedded Tomcat

OpenResty XRay Jul 22, 2026

OpenResty XRay Updated Jul 22, 2026 10 mins read

Java Application Profiling: CPU, Off-CPU & Disk I/O Without Safepoint Bias

openresty-xray java memory cpu
  • Profiling Java CPU hotspots with flame graphs
  • Off-CPU Java profiling: lock contention and blocking analysis
  • Java disk I/O profiling: tracing file and socket writes
  • OpenJDK 8/11/17/21 application profiling support
  • Automated sampling and expert analysis
  • Performance impact and overhead
  • FAQ
Photo by Yichun Zhang
  • Profiling Java CPU hotspots with flame graphs
  • Off-CPU Java profiling: lock contention and blocking analysis
  • Java disk I/O profiling: tracing file and socket writes
  • OpenJDK 8/11/17/21 application profiling support
  • Automated sampling and expert analysis
  • Performance impact and overhead
  • FAQ

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 5 mins read

‘A Quick Tour to OpenResty XRay’s Web Console’

tutorial openresty-xray web-console
  • Introduction to Insight Page
  • Comprehensive Report Details
  • Dashboard Overview
  • Use Guided Analysis Feature to Analyze Online
  • Setting and Configuration
  • What is OpenResty XRay
  • Introduction to Insight Page
  • Comprehensive Report Details
  • Dashboard Overview
  • Use Guided Analysis Feature to Analyze Online
  • Setting and Configuration
  • What is OpenResty XRay

OpenResty XRay Jul 23, 2026

OpenResty XRay Updated Jul 23, 2026 6 mins read

Diagnosing High Disk I/O in Python Applications with XRay

tutorial openresty-xray python disk I/O
  • Identifying the Python process with high disk I/O
  • Tracing Python disk read and write code paths with flame graphs
  • Automatic disk I/O analysis and reports
  • What is OpenResty XRay
  • Frequently Asked Questions
  • Identifying the Python process with high disk I/O
  • Tracing Python disk read and write code paths with flame graphs
  • Automatic disk I/O analysis and reports
  • What is OpenResty XRay
  • Frequently Asked Questions

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 5 mins read

Install OpenResty XRay’s Agents on Kubernetes cluster

tutorial openresty-xray k8s Agent install
  • Logging in to the Console
  • Installing the Agent on Kubernetes cluster
  • Configuring and Detecting Applications
  • Initiating Analyzers and Viewing Insights
  • Install Another Agent
  • What is OpenResty XRay
  • Logging in to the Console
  • Installing the Agent on Kubernetes cluster
  • Configuring and Detecting Applications
  • Initiating Analyzers and Viewing Insights
  • Install Another Agent
  • What is OpenResty XRay

OpenResty XRay Jul 23, 2026

OpenResty XRay Updated Jul 23, 2026 6 mins read

Why Your Rust Process Has High Disk I/O (and How to Find the Cause)

tutorial openresty-xray rust disk I/O
  • Identifying the Rust process with high disk I/O
  • Tracing the hottest Rust disk write code paths with flame graphs
  • Automatic disk I/O analysis and reports
  • What is OpenResty XRay
  • Frequently Asked Questions
  • Identifying the Rust process with high disk I/O
  • Tracing the hottest Rust disk write code paths with flame graphs
  • Automatic disk I/O analysis and reports
  • What is OpenResty XRay
  • Frequently Asked Questions

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 6 mins read

Introduction to OpenResty XRay Mobile Apps

tutorial openresty-xray mobile app
  • Download and install OpenResty XRay for Android
  • Sign into OpenResty XRay
  • Automatic analysis report
  • View the performance chart data on the dashboard page
  • Guided analysis feature
  • What is OpenResty XRay
  • Download and install OpenResty XRay for Android
  • Sign into OpenResty XRay
  • Automatic analysis report
  • View the performance chart data on the dashboard page
  • Guided analysis feature
  • What is OpenResty XRay

OpenResty XRay Aug 11, 2026

OpenResty XRay Updated Aug 11, 2026 5 mins read

PHP Memory Profiler: Locate the Largest Memory Objects in a Live PHP Process

tutorial openresty-xray php memory
  • Symptom: a PHP process using high memory in top
  • Profile the process with OpenResty XRay guided analysis to find the largest PHP objects
  • Trace the largest object back to its source line
  • Monitor PHP process memory automatically with Insights reports
  • FAQ
  • What is OpenResty XRay
  • Symptom: a PHP process using high memory in top
  • Profile the process with OpenResty XRay guided analysis to find the largest PHP objects
  • Trace the largest object back to its source line
  • Monitor PHP process memory automatically with Insights reports
  • FAQ
  • What is OpenResty XRay

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 7 mins read

Use C++ to Dynamic-Trace C++ Applications

stl c++ ebpf openresty-xray dynamic-tracing
  • Setting Up the Target C++ Program
  • Crafting the C++ (or Y++) Analyzer
  • Operationalizing the Target and Analyzer
  • Advancing Support for Complex C++ Applications
  • About the Debug Symbols
Photo by Yichun Zhang
  • Setting Up the Target C++ Program
  • Crafting the C++ (or Y++) Analyzer
  • Operationalizing the Target and Analyzer
  • Advancing Support for Complex C++ Applications
  • About the Debug Symbols

OpenResty XRay Jul 24, 2026

OpenResty XRay Updated Jul 24, 2026 6 mins read

Nginx 'No Debugging Symbols Found'? Rebuild Them Automatically with OpenResty XRay

tutorial openresty-xray debug-symbol nodwarf
  • Confirming Nginx Is Stripped and Debug Symbols Are Missing
  • Rebuild Missing Nginx Debug Symbols Automatically — No Recompile Needed
  • Continuous Analysis: Daily and Weekly Insights Reports
  • FAQ: nginx-dbg, recompiling, and profiling stripped binaries
  • Confirming Nginx Is Stripped and Debug Symbols Are Missing
  • Rebuild Missing Nginx Debug Symbols Automatically — No Recompile Needed
  • Continuous Analysis: Daily and Weekly Insights Reports
  • FAQ: nginx-dbg, recompiling, and profiling stripped binaries

OpenResty XRay Jul 24, 2026

OpenResty XRay Updated Jul 24, 2026 7 mins read

Automatic Core Dump Analysis (using OpenResty XRay)

openresty-xray core dump lua backtrace luajit dynamic tracing eBPF
  • Locate the core dump file from a crashed OpenResty/Nginx worker
  • Start automatic (guided) core dump analysis in OpenResty XRay
  • Read the signal, CPU registers, and C backtrace of the crash
  • Follow the Lua backtrace to the exact crashing line
  • Automatic Insights reports for online core dumps
  • Locate the core dump file from a crashed OpenResty/Nginx worker
  • Start automatic (guided) core dump analysis in OpenResty XRay
  • Read the signal, CPU registers, and C backtrace of the crash
  • Follow the Lua backtrace to the exact crashing line
  • Automatic Insights reports for online core dumps

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 13 mins read

How OpenResty XRay Enables Full-Stack Dynamic Tracing in Production

openresty-xray Ylang dynamic-tracing
  • Where Do Existing Dynamic Tracing Frameworks Fall Short in Production?
  • How Did OpenResty XRay Rethink Dynamic Tracing at the Architecture Level?
  • What Is a Full-Stack Flame Graph and How Do You Use It to Diagnose Performance Bottlenecks?
  • How Is OpenResty XRay Expanding Its Observability Coverage Over Time?
  • Further Reading and Real-World Case Studie
  • Where Do Existing Dynamic Tracing Frameworks Fall Short in Production?
  • How Did OpenResty XRay Rethink Dynamic Tracing at the Architecture Level?
  • What Is a Full-Stack Flame Graph and How Do You Use It to Diagnose Performance Bottlenecks?
  • How Is OpenResty XRay Expanding Its Observability Coverage Over Time?
  • Further Reading and Real-World Case Studie

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 6 mins read

Introduction to OpenResty XRay

openresty-xray nginx
  • Core Philosophy: A Tracing Engine Built for the Unknown
  • Turning Noise into Signal: How XRay Demystifies Production Issues
  • Empowering Engineering Teams in Cloud-Native Reality
  • Built on a Robust, Open Technological Foundatione
  • Real-World Success Stories
  • Core Philosophy: A Tracing Engine Built for the Unknown
  • Turning Noise into Signal: How XRay Demystifies Production Issues
  • Empowering Engineering Teams in Cloud-Native Reality
  • Built on a Robust, Open Technological Foundatione
  • Real-World Success Stories

OpenResty XRay Aug 11, 2026

OpenResty XRay Updated Aug 11, 2026 9 mins read

Hunting Down a Silent Memory Leak in OpenResty Without a Reboot

casestudy openresty-xray memory nginx
  • A Complete Dissection of a Production Memory Leak
  • Why Are These Problems Nearly Unsolvable?
  • A System Transformation
  • When Performance Issues Go Beyond Just Tools
  • A Complete Dissection of a Production Memory Leak
  • Why Are These Problems Nearly Unsolvable?
  • A System Transformation
  • When Performance Issues Go Beyond Just Tools

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 3 mins read

Anatomy of a 15x Performance Drop: A 90k to 6k QPS Root Cause Analysis with OpenResty XRay

openresty-xray casestudy lua nginx off-cpu
  • The 93% Performance Drop: Uncovering the Observability Blind Spot
  • OpenResty XRay Uncovers Connection Reuse Issues
  • Comparative Analysis Reveals Compilation Option Issues
  • Impact of Compiler Options on Instruction Execution Performance
  • The 93% Performance Drop: Uncovering the Observability Blind Spot
  • OpenResty XRay Uncovers Connection Reuse Issues
  • Comparative Analysis Reveals Compilation Option Issues
  • Impact of Compiler Options on Instruction Execution Performance

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 8 mins read

How We Pinpointed a 244ms Latency Spike in a 500k QPS OpenResty Gateway

openresty-xray qps p99 cpu
  • When Traditional Monitoring Fails to Pinpoint the Root Cause
  • From Heuristics to the Power of Dynamic Observability
  • Quantifiable Engineering Efficiency and Resource Optimization Results
  • Building Continuous Performance Observability
  • When Traditional Monitoring Fails to Pinpoint the Root Cause
  • From Heuristics to the Power of Dynamic Observability
  • Quantifiable Engineering Efficiency and Resource Optimization Results
  • Building Continuous Performance Observability

OpenResty XRay Jul 22, 2026

OpenResty XRay Updated Jul 22, 2026 11 mins read

How to Diagnose Java Memory Leaks in Production — Without Heap Dumps or Restarts

openresty-xray java memory
  • Why Full GCs Didn’t Reclaim the Heap: A Production Java Memory Leak
  • How to Diagnose a Java Memory Leak in Production Without a Heap Dump
  • How to Find a Java Memory Leak: A Reusable 3-Step Method
  • Why Use OpenResty XRay to Find Java Memory Leaks on a Live JVM?
  • FAQ
  • Why Full GCs Didn’t Reclaim the Heap: A Production Java Memory Leak
  • How to Diagnose a Java Memory Leak in Production Without a Heap Dump
  • How to Find a Java Memory Leak: A Reusable 3-Step Method
  • Why Use OpenResty XRay to Find Java Memory Leaks on a Live JVM?
  • FAQ

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 2 mins read

OpenResty XRay Version 25.10.11 Now Available

openresty-xray releases
  • Three Key Highlights
  • Enhanced Diagnostic Accuracy and Stability
  • Usability and Security Enhancements
  • Three Key Highlights
  • Enhanced Diagnostic Accuracy and Stability
  • Usability and Security Enhancements

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 4 mins read

How to use OpenResty XRay to quickly pinpoint memory leaks in C++ process

case-study openresty-xray Nginx c++
  • Technical Predicament and Initial Diagnosis
  • Flame Graphs: Pinpointing Memory Leak Hotspots
  • From Reactive to Proactive: XRay’s New Approach to Troubleshooting
  • The OpenResty XRay Closed-Loop Approach
  • Technical Predicament and Initial Diagnosis
  • Flame Graphs: Pinpointing Memory Leak Hotspots
  • From Reactive to Proactive: XRay’s New Approach to Troubleshooting
  • The OpenResty XRay Closed-Loop Approach

OpenResty XRay Jul 22, 2026

OpenResty XRay Updated Jul 22, 2026 4 mins read

Non-Invasive Java Profiler: Capture Method Arguments in Production Without a Java Agent

openresty-xray java probe
  • Why Non-Invasive Java Profiling Matters in Production
  • Hands-on Demo: Capturing Java Method Arguments in Production
  • How OpenResty XRay Differs from Common Java Profilers
  • Frequently Asked Questions
  • Why Non-Invasive Java Profiling Matters in Production
  • Hands-on Demo: Capturing Java Method Arguments in Production
  • How OpenResty XRay Differs from Common Java Profilers
  • Frequently Asked Questions

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 9 mins read

How OpenResty XRay's Node.js Function Probes Enable a New Monitoring Paradigm

openresty-xray Node.js
  • Why You Need a New Paradigm for Non-Invasive Function Probes
  • Hands-on Demo: Monitoring Function Parameters
  • How Top Teams Leverage Non-Intrusive Probes to Boost Engineering Efficiency
  • Why You Need a New Paradigm for Non-Invasive Function Probes
  • Hands-on Demo: Monitoring Function Parameters
  • How Top Teams Leverage Non-Intrusive Probes to Boost Engineering Efficiency

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 8 mins read

Application Lagging? OpenResty XRay: Instantly Uncover the Truth Behind 75ms Blockages

openresty-xray casestudy lua nginx off-cpu
  • Unraveling Performance Puzzles: CPU Resource Contention Comes to Light
  • The Real Culprit Revealed: Blocking Lua I/O Operations
  • Quantitative Analysis: The Impact of File IO Performance
  • Deep Dive: Understanding Event Loop Blocking in Nginx
  • Unraveling Performance Puzzles: CPU Resource Contention Comes to Light
  • The Real Culprit Revealed: Blocking Lua I/O Operations
  • Quantitative Analysis: The Impact of File IO Performance
  • Deep Dive: Understanding Event Loop Blocking in Nginx

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 8 mins read

Analyzing CPU Usage in Online Node.js Applications (Using OpenResty XRay)

openresty-xray Node.js memory cpu
  • High CPU Usage Issues in Node.js Applications
  • CPU Blocking Issues in Node.js Applications
  • Automated Sampling and Expert Analysis
  • Performance Impact and Overhead
  • Future Plans
  • High CPU Usage Issues in Node.js Applications
  • CPU Blocking Issues in Node.js Applications
  • Automated Sampling and Expert Analysis
  • Performance Impact and Overhead
  • Future Plans

OpenResty XRay Jul 24, 2026

OpenResty XRay Updated Jul 24, 2026 11 mins read

Nginx Core Dump Analysis: Catch a Worker Process Crash at the First Scene

casestudy openresty-xray undo coredump memory nginx
  • The Case: Frequent Nginx Worker Process Crashes No Log Could Explain
  • Analyzing the Recording: Replaying the Crash Back to the First Scene
  • Root Cause: A Use-After-Free in Nginx’s Connection Lifecycle
  • Frequently Asked Questions
  • The Case: Frequent Nginx Worker Process Crashes No Log Could Explain
  • Analyzing the Recording: Replaying the Crash Back to the First Scene
  • Root Cause: A Use-After-Free in Nginx’s Connection Lifecycle
  • Frequently Asked Questions

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 9 mins read

UDB + OpenResty XRay: Unlocking the Mystery of OpenResty Application Performance

openresty-xray undo lua udb
  • How OpenResty XRay Enhances Efficiency with UDB
  • Hands-On: Analyzing OpenResty Lua Call Stacks with UDB and OpenResty XRay
  • Advantages of Time-Travel Debugging
  • Summary
  • How OpenResty XRay Enhances Efficiency with UDB
  • Hands-On: Analyzing OpenResty Lua Call Stacks with UDB and OpenResty XRay
  • Advantages of Time-Travel Debugging
  • Summary

OpenResty XRay Jul 23, 2026

OpenResty XRay Updated Jul 23, 2026 8 mins read

How to Debug File I/O in Java with Time-Travel Call Stacks

openresty-xray undo java udb
  • Where IDE Breakpoints and Coredumps Fall Short in Java File I/O
  • Reconstructing the Full Java Call Stack from a Native write() Syscall
  • Debug Java File I/O Step by Step with Time-Travel Replay
  • Frequently Asked Questions
  • Where IDE Breakpoints and Coredumps Fall Short in Java File I/O
  • Reconstructing the Full Java Call Stack from a Native write() Syscall
  • Debug Java File I/O Step by Step with Time-Travel Replay
  • Frequently Asked Questions

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 4 mins read

Unveiling Python Code Execution with UDB

openresty-xray undo python udb
  • The Unique Value of UDB in Python Debugging
  • Enhancing Debugging Capabilities with OpenResty XRay
  • Real-World Example: Analyzing Python Network Request Call Stacks
  • Summary
  • The Unique Value of UDB in Python Debugging
  • Enhancing Debugging Capabilities with OpenResty XRay
  • Real-World Example: Analyzing Python Network Request Call Stacks
  • Summary

OpenResty XRay Aug 11, 2026

OpenResty XRay Updated Aug 11, 2026 7 mins read

Tracing an LRU Cache Memory Leak in OpenResty — Down to the Cached SSL Certificates

casestudy openresty-xray lru memory
  • Why a Low-Traffic OpenResty App Kept Leaking Memory
  • How We Traced the LRU Cache Memory Leak, Step by Step
  • The Result: From Unbounded Growth to Stable Memory
  • Why a Low-Traffic OpenResty App Kept Leaking Memory
  • How We Traced the LRU Cache Memory Leak, Step by Step
  • The Result: From Unbounded Growth to Stable Memory

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 6 mins read

Performance Breakthrough: 60% DNS Optimization Success with OpenResty XRay

tutorial openresty-xray customer-story casestudy
  • When the “Lifeline” DNS Service Faces a Performance Crisis
  • How to Investigate the Culprit Step by Step with OpenResty XRay
  • Precision “Treatment”: Three Steps to Rebirth
  • Summary: What We Achieved in Just a Few Minutes
  • What is OpenResty XRay
  • When the “Lifeline” DNS Service Faces a Performance Crisis
  • How to Investigate the Culprit Step by Step with OpenResty XRay
  • Precision “Treatment”: Three Steps to Rebirth
  • Summary: What We Achieved in Just a Few Minutes
  • What is OpenResty XRay

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 9 mins read

The Swiss Army Knife for Dynamic Tracing, How Ylang Tames Complexity

tutorial openresty-xray Ylang dynamic-tracing
  • Industry Pain Point: Why We Desperately Need a New Tracing Language
  • The Core Tech: What Makes Y Language a Game-Changer?
  • Ylang Syntax: The Familiarity of C, The Power of Advanced Tracing
  • Killer Applications: Solving Problems Beyond the Reach of Traditional Tools
  • Universal Platform Support: Y Lang Goes Everywhere
  • Compiler Wizardry: Forging a Superior Language with Superior Tools
  • Industry Pain Point: Why We Desperately Need a New Tracing Language
  • The Core Tech: What Makes Y Language a Game-Changer?
  • Ylang Syntax: The Familiarity of C, The Power of Advanced Tracing
  • Killer Applications: Solving Problems Beyond the Reach of Traditional Tools
  • Universal Platform Support: Y Lang Goes Everywhere
  • Compiler Wizardry: Forging a Superior Language with Superior Tools

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 10 mins read

Why Dynamic Tracing is the Future of Production Troubleshooting

tutorial openresty-xray Ylang dynamic-tracing
  • The Unseen Crisis in Modern Software
  • Why Traditional Tools Are Failing
  • Dynamic Tracing: The New Paradigm for Troubleshooting
  • The OpenResty XRay Difference
  • From Firefighting to True Observability
  • The Unseen Crisis in Modern Software
  • Why Traditional Tools Are Failing
  • Dynamic Tracing: The New Paradigm for Troubleshooting
  • The OpenResty XRay Difference
  • From Firefighting to True Observability

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 9 mins read

Deep Dive into Dynamic Tracing Technology: How OpenResty XRay Revolutionizes Problem Diagnosis

tutorial openresty-xray Ylang dynamic-tracing
  • Dynamic Tracing: A Powerful Tool for Solving Complex System Issues
  • Why Choose OpenResty XRay?
  • Product Focus: XRay Applications in Real-World Scenarios
  • Common Misconceptions and FAQs: What You Might Want to Know About Dynamic Tracing
  • Dynamic Tracing: A Powerful Tool for Solving Complex System Issues
  • Why Choose OpenResty XRay?
  • Product Focus: XRay Applications in Real-World Scenarios
  • Common Misconceptions and FAQs: What You Might Want to Know About Dynamic Tracing

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 7 mins read

The Next Stop for Observability: How OpenResty XRay Redefines Problem Troubleshooting

tutorial openresty-xray Ylang dynamic-tracing
  • Why is Problem Troubleshooting Becoming Increasingly Difficult in Modern Software Architecture?
  • Trend Insights: The Future of Observability Technology
  • How Does Dynamic Tracing Technology Break Through Abstraction Layers?
  • Use Case: Real-time Statistics of Plugin Resource Consumption in Production Kong Services
  • Conclusion
  • Why is Problem Troubleshooting Becoming Increasingly Difficult in Modern Software Architecture?
  • Trend Insights: The Future of Observability Technology
  • How Does Dynamic Tracing Technology Break Through Abstraction Layers?
  • Use Case: Real-time Statistics of Plugin Resource Consumption in Production Kong Services
  • Conclusion

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 7 mins read

Traditional Methods vs. Dynamic Tracing: A Revolution in Efficiency and Control

tutorial openresty-xray Ylang dynamic-tracing
  • A Revolution in Efficiency and Control
  • Dynamic Tracing: X-Ray Vision for Your Systems
  • From Flame Graphs to System Panorama
  • Why Choose OpenResty XRay?
  • The Future of Observability: New Frontiers in Dynamic Tracing
  • A Revolution in Efficiency and Control
  • Dynamic Tracing: X-Ray Vision for Your Systems
  • From Flame Graphs to System Panorama
  • Why Choose OpenResty XRay?
  • The Future of Observability: New Frontiers in Dynamic Tracing

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 9 mins read

Why is Dynamic Tracing Difficult to Implement? How Does OpenResty XRay Break Through?

tutorial openresty-xray Ylang dynamic-tracing
  • Why is Problem Troubleshooting Becoming Increasingly Difficult in Modern Software Architecture?
  • Trend Insights: The Future of Observability Technology
  • How Does Dynamic Tracing Technology Break Through Abstraction Layers?
  • Use Case: Real-time Statistics of Plugin Resource Consumption in Production Kong Services
  • Conclusion
  • Why is Problem Troubleshooting Becoming Increasingly Difficult in Modern Software Architecture?
  • Trend Insights: The Future of Observability Technology
  • How Does Dynamic Tracing Technology Break Through Abstraction Layers?
  • Use Case: Real-time Statistics of Plugin Resource Consumption in Production Kong Services
  • Conclusion

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 5 mins read

Self-Optimization: The Performance Evolution of OpenResty XRay

tutorial openresty-xray
  • Challenges and Pain Points
  • OpenResty XRay’s Self-Analysis Process
  • Remarkable Optimization Results
  • Technical Insights and Business Value
  • Conclusion
  • Challenges and Pain Points
  • OpenResty XRay’s Self-Analysis Process
  • Remarkable Optimization Results
  • Technical Insights and Business Value
  • Conclusion

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 4 mins read

Case Study: OpenResty XRay Doubles Ylang Compiler Performance

tutorial ylang openresty-xray analyzer
  • Case Study: OpenResty XRay Doubles Ylang Compiler Performance
  • Significant Optimization Results
  • Ylang Language: The Ideal Tool for Dynamic Tracing
  • A Model of Technical Synergy
  • Further Reading
  • Case Study: OpenResty XRay Doubles Ylang Compiler Performance
  • Significant Optimization Results
  • Ylang Language: The Ideal Tool for Dynamic Tracing
  • A Model of Technical Synergy
  • Further Reading

OpenResty XRay Jul 22, 2026

OpenResty XRay Updated Jul 22, 2026 10 mins read

Java Application Profiling: CPU, Off-CPU & Disk I/O Without Safepoint Bias

openresty-xray java memory cpu
  • Profiling Java CPU hotspots with flame graphs
  • Off-CPU Java profiling: lock contention and blocking analysis
  • Java disk I/O profiling: tracing file and socket writes
  • OpenJDK 8/11/17/21 application profiling support
  • Automated sampling and expert analysis
  • Performance impact and overhead
  • FAQ
Photo by Yichun Zhang
  • Profiling Java CPU hotspots with flame graphs
  • Off-CPU Java profiling: lock contention and blocking analysis
  • Java disk I/O profiling: tracing file and socket writes
  • OpenJDK 8/11/17/21 application profiling support
  • Automated sampling and expert analysis
  • Performance impact and overhead
  • FAQ

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 6 mins read

Introduction to OpenResty XRay Mobile Apps

tutorial openresty-xray mobile app
  • Download and install OpenResty XRay for Android
  • Sign into OpenResty XRay
  • Automatic analysis report
  • View the performance chart data on the dashboard page
  • Guided analysis feature
  • What is OpenResty XRay
  • Download and install OpenResty XRay for Android
  • Sign into OpenResty XRay
  • Automatic analysis report
  • View the performance chart data on the dashboard page
  • Guided analysis feature
  • What is OpenResty XRay

OpenResty XRay Aug 6, 2026

OpenResty XRay Updated Aug 6, 2026 26 mins read

The Wonderland of Dynamic Tracing (Part 1 of 3)

dynamic-tracing openresty-xray
  • Dynamic Tracing
  • What It Is
  • Too Good to be True?
  • How it Works
  • Still Having Doubts?
  • The Advantages of Dynamic Tracing
  • DTrace
  • SystemTap
  • DTrace and SystemTap
  • Applications of SystemTap in Production
Photo by Philip Brown
  • Dynamic Tracing
  • What It Is
  • Too Good to be True?
  • How it Works
  • Still Having Doubts?
  • The Advantages of Dynamic Tracing
  • DTrace
  • SystemTap
  • DTrace and SystemTap
  • Applications of SystemTap in Production

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 6 mins read

The Wonderland of Dynamic Tracing (Part 3 of 3)

dynamic-tracing openresty-xray
  • Dynamic Tracing Support in Linux Kernels
  • Hardware Tracing
  • Analyze Remains of Dead Process
  • Traditional Debugging Technologies
  • A Messy World of Debugging
  • OpenResty XRay
Photo by L N
  • Dynamic Tracing Support in Linux Kernels
  • Hardware Tracing
  • Analyze Remains of Dead Process
  • Traditional Debugging Technologies
  • A Messy World of Debugging
  • OpenResty XRay

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 8 mins read

One String Value Crashed Asia's Biggest Streaming Site — We Found It with OpenResty XRay

dynamic-tracing openresty-xray bilibili
  • The Platform Behind Hundreds of Millions of Streams
  • When Rebooting Doesn’t Help
  • Finding the Root Cause Without Touching a Single Line of Code
  • One Type Mismatch, Entire System Down
Photo by Yichun Zhang
  • The Platform Behind Hundreds of Millions of Streams
  • When Rebooting Doesn’t Help
  • Finding the Root Cause Without Touching a Single Line of Code
  • One Type Mismatch, Entire System Down

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 5 mins read

Install OpenResty XRay’s Agents on Kubernetes cluster

tutorial openresty-xray k8s Agent install
  • Logging in to the Console
  • Installing the Agent on Kubernetes cluster
  • Configuring and Detecting Applications
  • Initiating Analyzers and Viewing Insights
  • Install Another Agent
  • What is OpenResty XRay
  • Logging in to the Console
  • Installing the Agent on Kubernetes cluster
  • Configuring and Detecting Applications
  • Initiating Analyzers and Viewing Insights
  • Install Another Agent
  • What is OpenResty XRay

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 4 mins read

Install OpenResty XRay’s Agents on Amazon Linux via Package Bundles

tutorial openresty-xray Amazon-linux2 Agent install
  • Logging in to the Console
  • Installing the Agent via Bundle Packages
  • Configuring and Detecting Applications
  • Initiating Analyzers and Viewing Insights
  • Install Another Agent
  • What is OpenResty XRay
  • Logging in to the Console
  • Installing the Agent via Bundle Packages
  • Configuring and Detecting Applications
  • Initiating Analyzers and Viewing Insights
  • Install Another Agent
  • What is OpenResty XRay

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 5 mins read

Install OpenResty XRay’s Agents on Ubuntu via Deb Packages

tutorial openresty-xray Ubuntu Agent install
  • Logging in to the Console
  • Installing the Agent via Deb Packages
  • Checking the Agent Status and Logs
  • Configuring and Detecting Applications
  • Initiating Analyzers and Viewing Insights
  • Install Another Agent
  • What is OpenResty XRay
  • Logging in to the Console
  • Installing the Agent via Deb Packages
  • Checking the Agent Status and Logs
  • Configuring and Detecting Applications
  • Initiating Analyzers and Viewing Insights
  • Install Another Agent
  • What is OpenResty XRay

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 4 mins read

Install OpenResty XRay’s Agents on CentOS via RPM Packages

tutorial openresty-xray CentOS Agent install
  • Logging in to the Console
  • Installing the Agent via RPM Packages
  • Checking the Agent Status and Logs
  • Configuring and Detecting Applications
  • Initiating Analyzers and Viewing Insights
  • Install Another Agent
  • What is OpenResty XRay
  • Logging in to the Console
  • Installing the Agent via RPM Packages
  • Checking the Agent Status and Logs
  • Configuring and Detecting Applications
  • Initiating Analyzers and Viewing Insights
  • Install Another Agent
  • What is OpenResty XRay

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 6 mins read

How to deploy the on-premises version of OpenResty XRay on Microsoft's Azure cloud

tutorial openresty-xray azure
  • Create a subscription and a resource group
  • Create the Azure Kubernetes service
  • Prepare the environment variables
  • Log in to Azure from the command line
  • Create the namespace and secret for Kubernetes
  • Create the Azure Disk
  • Update the configuration file for the persistent volume
  • Update the Kubernetes configuration file
  • Create the persistent volume
  • Deploy the Kubernetes service
  • Configure the application gateway
  • Create a subscription and a resource group
  • Create the Azure Kubernetes service
  • Prepare the environment variables
  • Log in to Azure from the command line
  • Create the namespace and secret for Kubernetes
  • Create the Azure Disk
  • Update the configuration file for the persistent volume
  • Update the Kubernetes configuration file
  • Create the persistent volume
  • Deploy the Kubernetes service
  • Configure the application gateway

OpenResty XRay Jul 23, 2026

OpenResty XRay Updated Jul 23, 2026 6 mins read

Debugging High Disk I/O in Go Services on Linux

tutorial openresty-xray go golang disk I/O
  • Identifying the Go process with high disk I/O
  • Tracing Go disk read and write code paths with flame graphs
  • Automatic disk I/O analysis and reports
  • What is OpenResty XRay
  • Frequently Asked Questions
  • Identifying the Go process with high disk I/O
  • Tracing Go disk read and write code paths with flame graphs
  • Automatic disk I/O analysis and reports
  • What is OpenResty XRay
  • Frequently Asked Questions

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 5 mins read

Pinpointing CPU-Hottest Go Code Paths Inside Prometheus (using OpenResty XRay)

tutorial openresty-xray prometheus garbage collection go golang
  • Problem: high CPU usage
  • Use the guidede analysis feature of OpenResty XRay to spot the CPU-hottest Go code paths
  • Automatic analysis and reports
  • What is OpenResty XRay
  • Problem: high CPU usage
  • Use the guidede analysis feature of OpenResty XRay to spot the CPU-hottest Go code paths
  • Automatic analysis and reports
  • What is OpenResty XRay

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 5 mins read

How CPU Time is Spent inside Go’s CockroachDB (using OpenResty XRay)

tutorial openresty-xray cpu Go CockroachDB
  • Problem: high CPU usage
  • Use the guidede analysis feature of OpenResty XRay to spot the most CPU-intensive Go code paths
  • Automatic analysis and reports
  • What is OpenResty XRay
  • Problem: high CPU usage
  • Use the guidede analysis feature of OpenResty XRay to spot the most CPU-intensive Go code paths
  • Automatic analysis and reports
  • What is OpenResty XRay

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 5 mins read

Measuring the Performance Overhead of OpenResty XRay When Profiling Go Applications

tutorial openresty-xray go overhead
  • Process Performance Before Running Analysis
  • Performance Impact When the Analyzer is Running
  • Impact Measurement on Throughput and Latency
  • What is OpenResty XRay
  • Process Performance Before Running Analysis
  • Performance Impact When the Analyzer is Running
  • Impact Measurement on Throughput and Latency
  • What is OpenResty XRay

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 4 mins read

Dynamic-Tracing Custom Go Programs with Custom Ylang Analyzers (using OpenResty XRay)

tutorial openresty-xray ylang analyzer Go
  • Insert two key-value Pairs into a Go Variable
  • Write a Customize Ylang Analyzer to Dynamically Trace the Go program
  • Test the Results
  • What is OpenResty XRay
  • Insert two key-value Pairs into a Go Variable
  • Write a Customize Ylang Analyzer to Dynamically Trace the Go program
  • Test the Results
  • What is OpenResty XRay

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 6 mins read

How CPU time is spent inside Go's etcd server (using OpenResty XRay)

tutorial openresty-xray go cpu etcd
  • Problem: high CPU usage
  • Use the guidede analysis feature of OpenResty XRay to spot the hottest Go code paths
  • Automatic analysis and reports
  • What is OpenResty XRay
  • Problem: high CPU usage
  • Use the guidede analysis feature of OpenResty XRay to spot the hottest Go code paths
  • Automatic analysis and reports
  • What is OpenResty XRay

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 5 mins read

Pinpointing the hottest Go code paths with high CPU usage (using OpenResty XRay)

tutorial openresty-xray go cpu
  • Problem: high CPU usage
  • Use the guidede analysis feature of OpenResty XRay to spot the hottest Go code paths
  • Automatic analysis and reports
  • What is OpenResty XRay
  • Problem: high CPU usage
  • Use the guidede analysis feature of OpenResty XRay to spot the hottest Go code paths
  • Automatic analysis and reports
  • What is OpenResty XRay

OpenResty XRay Jul 23, 2026

OpenResty XRay Updated Jul 23, 2026 6 mins read

Diagnosing High Disk I/O in Python Applications with XRay

tutorial openresty-xray python disk I/O
  • Identifying the Python process with high disk I/O
  • Tracing Python disk read and write code paths with flame graphs
  • Automatic disk I/O analysis and reports
  • What is OpenResty XRay
  • Frequently Asked Questions
  • Identifying the Python process with high disk I/O
  • Tracing Python disk read and write code paths with flame graphs
  • Automatic disk I/O analysis and reports
  • What is OpenResty XRay
  • Frequently Asked Questions

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 2 mins read

Performance Impact of OpenResty XRay when Tracing Python Apps

tutorial openresty-xray python overhead
  • Process Performance Before Running Analysis
  • Performance Impact When the Analyzer is Running
  • Impact Measurement on Throughput and Latency
  • What is OpenResty XRay
  • Process Performance Before Running Analysis
  • Performance Impact When the Analyzer is Running
  • Impact Measurement on Throughput and Latency
  • What is OpenResty XRay

OpenResty XRay Aug 11, 2026

OpenResty XRay Updated Aug 11, 2026 5 mins read

Python Memory Profiler: Find the Largest Objects Eating RAM Without Code Changes

tutorial openresty-xray python memory
  • Find which Python process is using the most memory
  • Profile Python memory with guided analysis: find the largest objects and their modules
  • Automatically monitor Python memory usage with scheduled reports
  • What is OpenResty XRay
  • Find which Python process is using the most memory
  • Profile Python memory with guided analysis: find the largest objects and their modules
  • Automatically monitor Python memory usage with scheduled reports
  • What is OpenResty XRay

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 5 mins read

Pinpointing the blocking Python code paths (using OpenResty XRay)

tutorial openresty-xray python off-cpu
  • Problem: low CPU usage
  • Use the guidede analysis feature of OpenResty XRay to spot the blocking Python code paths
  • Automatic analysis and reports
  • What is OpenResty XRay
  • Problem: low CPU usage
  • Use the guidede analysis feature of OpenResty XRay to spot the blocking Python code paths
  • Automatic analysis and reports
  • What is OpenResty XRay

OpenResty XRay Jul 22, 2026

OpenResty XRay Updated Jul 22, 2026 8 mins read

Java Tomcat Slow Response Time: Pinpoint the Exact Slow Request with PCAP

openresty-xray java tomcat latency performance
  • Diagnose Tomcat slow response time by catching the exact slow request
  • Selective packet capture: filter by duration, status, and path
  • Per-request PCAP download for one specific slow request
  • Tell server-side latency from network delay
  • Works for Spring Boot apps with embedded Tomcat
Photo by Yichun Zhang
  • Diagnose Tomcat slow response time by catching the exact slow request
  • Selective packet capture: filter by duration, status, and path
  • Per-request PCAP download for one specific slow request
  • Tell server-side latency from network delay
  • Works for Spring Boot apps with embedded Tomcat

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 6 mins read

Find Blocking Perl Code Paths Holding back CPU Usage (Using OpenResty XRay)

tutorial openresty-xray perl off-cpu
  • Problem: low CPU usage
  • Use the guided analysis feature of OpenResty XRay to spot the blocking Perl code paths
  • Automatic analysis and reports
  • What is OpenResty XRay
  • About The Author
  • Problem: low CPU usage
  • Use the guided analysis feature of OpenResty XRay to spot the blocking Perl code paths
  • Automatic analysis and reports
  • What is OpenResty XRay
  • About The Author

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 5 mins read

Performance Overhead of OpenResty XRay when Tracing Perl Apps

tutorial openresty-xray perl overhead
  • Process Performance Before Running Analysis
  • Performance Impact When the Analyzer is Running
  • Impact Measurement on Throughput and Latency
  • What is OpenResty XRay
  • Process Performance Before Running Analysis
  • Performance Impact When the Analyzer is Running
  • Impact Measurement on Throughput and Latency
  • What is OpenResty XRay

OpenResty XRay Aug 11, 2026

OpenResty XRay Updated Aug 11, 2026 6 mins read

Locate the Largest Memory Objects in a Live Perl Process

tutorial openresty-xray perl memory
  • Symptom: a Perl process using high memory in top
  • Profile the process with OpenResty XRay guided analysis to find the largest Perl objects
  • Trace the largest object back to its source file
  • Monitor Perl process memory automatically with Insights reports
  • FAQ
  • What is OpenResty XRay
  • Symptom: a Perl process using high memory in top
  • Profile the process with OpenResty XRay guided analysis to find the largest Perl objects
  • Trace the largest object back to its source file
  • Monitor Perl process memory automatically with Insights reports
  • FAQ
  • What is OpenResty XRay

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 5 mins read

Pinpointing hottest Perl code paths (using OpenResty XRay)

tutorial openresty-xray perl cpu
  • Problem: high CPU usage
  • Use the guidede analysis feature of OpenResty XRay to spot the hottest Perl code paths
  • Automatic analysis and reports
  • What is OpenResty XRay
  • Problem: high CPU usage
  • Use the guidede analysis feature of OpenResty XRay to spot the hottest Perl code paths
  • Automatic analysis and reports
  • What is OpenResty XRay

OpenResty XRay Jul 23, 2026

OpenResty XRay Updated Jul 23, 2026 6 mins read

Why Your Rust Process Has High Disk I/O (and How to Find the Cause)

tutorial openresty-xray rust disk I/O
  • Identifying the Rust process with high disk I/O
  • Tracing the hottest Rust disk write code paths with flame graphs
  • Automatic disk I/O analysis and reports
  • What is OpenResty XRay
  • Frequently Asked Questions
  • Identifying the Rust process with high disk I/O
  • Tracing the hottest Rust disk write code paths with flame graphs
  • Automatic disk I/O analysis and reports
  • What is OpenResty XRay
  • Frequently Asked Questions

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 2 mins read

Tested in Production: The Performance Impact of OpenResty XRay When Tracing Rust Applications

tutorial openresty-xray rust overhead
  • Process Performance Before Running Analysis
  • Performance Impact When the Analyzer is Running
  • Impact Measurement on Throughput and Latency
  • What is OpenResty XRay
  • Process Performance Before Running Analysis
  • Performance Impact When the Analyzer is Running
  • Impact Measurement on Throughput and Latency
  • What is OpenResty XRay

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 6 mins read

How CPU time is spent inside Rust’s Sled library (using OpenResty XRay)

tutorial openresty-xray cpu Sled Rust
  • Problem: high CPU usage
  • Use the guidede analysis feature of OpenResty XRay to spot the most CPU-intensive Rust code paths
  • Automatic analysis and reports
  • What is OpenResty XRay
  • Problem: high CPU usage
  • Use the guidede analysis feature of OpenResty XRay to spot the most CPU-intensive Rust code paths
  • Automatic analysis and reports
  • What is OpenResty XRay

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 7 mins read

Use C++ to Dynamic-Trace C++ Applications

stl c++ ebpf openresty-xray dynamic-tracing
  • Setting Up the Target C++ Program
  • Crafting the C++ (or Y++) Analyzer
  • Operationalizing the Target and Analyzer
  • Advancing Support for Complex C++ Applications
  • About the Debug Symbols
Photo by Yichun Zhang
  • Setting Up the Target C++ Program
  • Crafting the C++ (or Y++) Analyzer
  • Operationalizing the Target and Analyzer
  • Advancing Support for Complex C++ Applications
  • About the Debug Symbols

OpenResty XRay Jul 24, 2026

OpenResty XRay Updated Jul 24, 2026 6 mins read

Nginx 'No Debugging Symbols Found'? Rebuild Them Automatically with OpenResty XRay

tutorial openresty-xray debug-symbol nodwarf
  • Confirming Nginx Is Stripped and Debug Symbols Are Missing
  • Rebuild Missing Nginx Debug Symbols Automatically — No Recompile Needed
  • Continuous Analysis: Daily and Weekly Insights Reports
  • FAQ: nginx-dbg, recompiling, and profiling stripped binaries
  • Confirming Nginx Is Stripped and Debug Symbols Are Missing
  • Rebuild Missing Nginx Debug Symbols Automatically — No Recompile Needed
  • Continuous Analysis: Daily and Weekly Insights Reports
  • FAQ: nginx-dbg, recompiling, and profiling stripped binaries

OpenResty XRay Jul 24, 2026

OpenResty XRay Updated Jul 24, 2026 7 mins read

Automatic Core Dump Analysis (using OpenResty XRay)

openresty-xray core dump lua backtrace luajit dynamic tracing eBPF
  • Locate the core dump file from a crashed OpenResty/Nginx worker
  • Start automatic (guided) core dump analysis in OpenResty XRay
  • Read the signal, CPU registers, and C backtrace of the crash
  • Follow the Lua backtrace to the exact crashing line
  • Automatic Insights reports for online core dumps
  • Locate the core dump file from a crashed OpenResty/Nginx worker
  • Start automatic (guided) core dump analysis in OpenResty XRay
  • Read the signal, CPU registers, and C backtrace of the crash
  • Follow the Lua backtrace to the exact crashing line
  • Automatic Insights reports for online core dumps

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 5 mins read

How CPU Time is Spent inside Envoy Servers (using OpenResty XRay)

tutorial openresty-xray CPU Envoy
  • Problem: high CPU usage
  • Use the guidede analysis feature of OpenResty XRay to spot the most CPU-intensive C++ code paths inside Envoy Servers
  • Automatic analysis and reports
  • What is OpenResty XRay
  • Problem: high CPU usage
  • Use the guidede analysis feature of OpenResty XRay to spot the most CPU-intensive C++ code paths inside Envoy Servers
  • Automatic analysis and reports
  • What is OpenResty XRay

OpenResty XRay Jul 24, 2026

OpenResty XRay Updated Jul 24, 2026 8 mins read

How to Diagnose 504 Gateway Timeout Errors in OpenResty & Nginx

tutorial openresty-xray 504 timeout
  • Confirm HTTP 504 gateway timeout errors in the OpenResty/Nginx access log
  • Diagnose the 504 root cause with OpenResty XRay Guided Analysis
  • Slow upstream, slow network link, or a too-short timeout setting
  • Automatic root-cause reports on the Insights page
  • Confirm HTTP 504 gateway timeout errors in the OpenResty/Nginx access log
  • Diagnose the 504 root cause with OpenResty XRay Guided Analysis
  • Slow upstream, slow network link, or a too-short timeout setting
  • Automatic root-cause reports on the Insights page

OpenResty XRay Aug 11, 2026

OpenResty XRay Updated Aug 11, 2026 6 mins read

Django Memory Profiler: Analyze Object-Level Memory Usage in a Live App

tutorial openresty-xray python memory django
  • Spot a high-memory Django process with ps
  • Profile the Django app’s memory usage with Guided Analysis
  • Read the flame graph: which Python module uses the most memory
  • Monitor Django memory usage automatically with Insights
  • What is OpenResty XRay
  • Spot a high-memory Django process with ps
  • Profile the Django app’s memory usage with Guided Analysis
  • Read the flame graph: which Python module uses the most memory
  • Monitor Django memory usage automatically with Insights
  • What is OpenResty XRay

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 6 mins read

How CPU time is spent inside llama.cpp + LLaMA2 (using OpenResty XRay)

tutorial openresty-xray LLM cpu generative-AI llama2 llama.cpp profiling AI
  • Problem: high CPU usage
  • Use the guidede analysis feature of OpenResty XRay to spot the hottest C++ code paths
  • Automatic analysis and reports
  • What is OpenResty XRay
  • Problem: high CPU usage
  • Use the guidede analysis feature of OpenResty XRay to spot the hottest C++ code paths
  • Automatic analysis and reports
  • What is OpenResty XRay

OpenResty XRay Aug 11, 2026

OpenResty XRay Updated Aug 11, 2026 8 mins read

Find Leaked Lua Tables: the registry / _LOADED (package.loaded) Reference Path in OpenResty XRay

openresty memory-leak openresty-xray case-study
  • How LuaJIT manages memory
  • OpenResty XRay’s command-line tools
  • A leaking Lua table example
  • Breaking down memory by LuaJIT GC object type
  • Reading the lj-gco-ref flame graph: registry, _LOADED, package.loaded
  • Fully-automated Lua memory leak analysis
  • How LuaJIT manages memory
  • OpenResty XRay’s command-line tools
  • A leaking Lua table example
  • Breaking down memory by LuaJIT GC object type
  • Reading the lj-gco-ref flame graph: registry, _LOADED, package.loaded
  • Fully-automated Lua memory leak analysis

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 8 mins read

Real-Time Request Counting against Nginx Processes via YSQL

openresty-xray ysql nginx
  • How to install the run-ysql tool
  • Count total requests served in real time
  • Filter out specific requests
  • Using YSQL in the Web Console
  • True non-invasive tracing
Photo by Yichun Zhang
  • How to install the run-ysql tool
  • Count total requests served in real time
  • Filter out specific requests
  • Using YSQL in the Web Console
  • True non-invasive tracing

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 11 mins read

Tracing the Slowest PCRE Regular Expressions in OpenResty or Nginx Processes

regexes openresty-xray dynamic-tracing nginx
  • System Environment
  • Narrowing Down the Culprit without Guessing
  • Limiting the execution overhead of PCRE
  • Non-Backtracking Regular Expression Engines
  • Lua’s Builtin Patterns
  • Tracing Applications inside Containers
  • How The Tools are Implemented
  • The Overhead of the Tools
  • System Environment
  • Narrowing Down the Culprit without Guessing
  • Limiting the execution overhead of PCRE
  • Non-Backtracking Regular Expression Engines
  • Lua’s Builtin Patterns
  • Tracing Applications inside Containers
  • How The Tools are Implemented
  • The Overhead of the Tools

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 9 mins read

Listing Loaded Lua Modules in OpenResty or Nginx Processes

ylua openresty-xray nginx lua dynamic-tracing
  • System Environment
  • Names of Loaded Lua Modules
  • Running Directly in the Web Console
  • Tracing Applications inside Containers
  • How The Tools are Implemented
  • The Overhead of the Tools
Photo by Yichun Zhang
  • System Environment
  • Names of Loaded Lua Modules
  • Running Directly in the Web Console
  • Tracing Applications inside Containers
  • How The Tools are Implemented
  • The Overhead of the Tools

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 11 mins read

Analyzing the Most CPU-Consuming Requests in OpenResty or Nginx

tutorial cpu nginx openresty-xray ysql
  • System Environment
  • CPU-Hottest Request Hostnames
  • CPU-Hottest Request URIs
  • Digging Deeper
  • Running Directly in the Web Console
  • Tracing Applications inside Containers
  • How The Tools are Implemented
  • The Overhead of the Tools
Photo by Yichun Zhang
  • System Environment
  • CPU-Hottest Request Hostnames
  • CPU-Hottest Request URIs
  • Digging Deeper
  • Running Directly in the Web Console
  • Tracing Applications inside Containers
  • How The Tools are Implemented
  • The Overhead of the Tools

OpenResty XRay Aug 6, 2026

OpenResty XRay Updated Aug 6, 2026 15 mins read

Ylang in Production: Container Tracing, Stack Unwinding & Core Dumps (Series Part 4)

ylang openresty-xray dynamic-tracing
  • Transparent Container Tracing
  • Efficient Stack Unwinding
  • Analyzing Dead Processes (Core Dumps)
  • Very Low Tracing Overhead
  • Standard Ylang Libraries & Tools
  • Network Filtering & Control
  • The Ylang Compiler’s Implementation
  • Operating System Support
  • Contributions to Open-Source Communities
Photo by Yichun Zhang
  • Transparent Container Tracing
  • Efficient Stack Unwinding
  • Analyzing Dead Processes (Core Dumps)
  • Very Low Tracing Overhead
  • Standard Ylang Libraries & Tools
  • Network Filtering & Control
  • The Ylang Compiler’s Implementation
  • Operating System Support
  • Contributions to Open-Source Communities

OpenResty XRay Aug 6, 2026

OpenResty XRay Updated Aug 6, 2026 11 mins read

Ylang: Regex, Full Control Flow & Transparent Debug Symbol Handling (Series Part 3)

ylang openresty-xray dynamic-tracing
  • The Language Syntax (Continued)
    • String Literals
    • Built-in Regex Support
    • Full Control-Flow Support
    • Floating-Point Number Support
    • Compared to Open-Source Toolchains
  • Transparent Debug Symbol Handling
    • Debug Symbols: No Runtime Overhead
    • Centralized Package Database
    • Fuzzy Matching Debug Symbols
Photo by Yichun Zhang
  • The Language Syntax (Continued)
    • String Literals
    • Built-in Regex Support
    • Full Control-Flow Support
    • Floating-Point Number Support
    • Compared to Open-Source Toolchains
  • Transparent Debug Symbol Handling
    • Debug Symbols: No Runtime Overhead
    • Centralized Package Database
    • Fuzzy Matching Debug Symbols

OpenResty XRay Aug 6, 2026

OpenResty XRay Updated Aug 6, 2026 15 mins read

Ylang: A Dynamic Tracing Language for eBPF, SystemTap, GDB, and More (Part 1 of 4)

ylang openresty-xray dynamic-tracing
  • What is Dynamic Tracing
  • Why the “Y” Name
  • Getting Started with Ylang
  • Dynamic Tracing Backends: eBPF+, Stap+, GDB, and ODB
  • Why a Unified Frontend Language for Dynamic Tracing
  • The Ylang Syntax: Genuinely C-Compatible
  • Frequently Asked Questions
Photo by Yichun Zhang
  • What is Dynamic Tracing
  • Why the “Y” Name
  • Getting Started with Ylang
  • Dynamic Tracing Backends: eBPF+, Stap+, GDB, and ODB
  • Why a Unified Frontend Language for Dynamic Tracing
  • The Ylang Syntax: Genuinely C-Compatible
  • Frequently Asked Questions

OpenResty XRay Jul 7, 2026

OpenResty XRay Updated Jul 7, 2026 16 mins read

LuaJIT GC64 Mode: Removing the 2GB Memory Limit

luajit openresty memory openresty-xray
  • The Old Memory Limit
    • When Hitting The Memory Limit
    • The Memory Limit Is Per Process
    • GC-Managed Memory
    • Memory Allocated Outside GC
    • Extending The x64 Mode to The 4 GB Limit
  • The New GC64 Mode
    • How to Enable The GC64 Mode
    • Performance Impact
    • Debugging and Profiling Tool Chains
  • The Old Memory Limit
    • When Hitting The Memory Limit
    • The Memory Limit Is Per Process
    • GC-Managed Memory
    • Memory Allocated Outside GC
    • Extending The x64 Mode to The 4 GB Limit
  • The New GC64 Mode
    • How to Enable The GC64 Mode
    • Performance Impact
    • Debugging and Profiling Tool Chains
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