Featured Articles

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

Resolving Bilibili’s major site incident with OpenResty XRay

Resolving Bilibili’s major site incident with OpenResty XRay

Photo by Yichun Zhang
openresty-xray
...
nginx lua openresty off-cpu
6 mins read

When Lua IPC Pipes Block OpenResty or Nginx's Event Loops

When Lua IPC Pipes Block OpenResty or Nginx's Event Loops

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 Yichun Zhang
openresty-xray
...
reports
10 mins read

Automatic Analysis Reports in OpenResty XRay

Automatic Analysis Reports in OpenResty XRay

Photo by Guido Jansen
nginx
...
openresty lua cpu openresty-xray dynamic-tracing
19 mins read

Introduction to Lua-Land CPU Flame Graphs

Introduction to Lua-Land CPU Flame Graphs

Photo by Elena Mozhvilo
nginx
...
openresty memory openresty-xray dynamic-tracing
10 mins read

Memory Fragmentation in OpenResty and Nginx's Shared Memory Zones

Memory Fragmentation in OpenResty and Nginx's Shared Memory Zones

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
11 mins read

How OpenResty and Nginx Allocate and Manage Memory

How OpenResty and Nginx Allocate and Manage Memory

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 17, 2025

OpenResty XRay Updated Jun 17, 2025 16 mins read

The LuaJIT GC64 Mode

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

OpenResty XRay Dec 3, 2025

OpenResty XRay Updated Dec 3, 2025 11 mins read

Deconstructing the LuaJIT Pseudo Memory Leak

memory openresty-xray luajit
  • Defining Pseudo Memory Leak
  • Beyond Crashes, Architectural Unpredictability
  • Why Code Optimization Is No Longer Effective?
  • From Passive Retention to Proactive Reclamation
  • Enabling Memory to Breathe
  • Defining Pseudo Memory Leak
  • Beyond Crashes, Architectural Unpredictability
  • Why Code Optimization Is No Longer Effective?
  • From Passive Retention to Proactive Reclamation
  • Enabling Memory to Breathe

OpenResty XRay Dec 2, 2025

OpenResty XRay Updated Dec 2, 2025 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 Nov 11, 2025

OpenResty XRay Updated Nov 11, 2025 9 mins read

How OpenResty XRay Pinpointed Java Memory Issues

openresty-xray java memory
  • Background and Problem
  • Systematic Diagnostic Path: From Leak to Jitter
  • Diagnostic Efficiency and System Improvements
  • Why Choose OpenResty XRay for Java Application Memory Analysis?
  • Background and Problem
  • Systematic Diagnostic Path: From Leak to Jitter
  • Diagnostic Efficiency and System Improvements
  • Why Choose OpenResty XRay for Java Application Memory Analysis?

OpenResty XRay Oct 31, 2025

OpenResty XRay Updated Oct 31, 2025 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 Dec 2, 2025

OpenResty XRay Updated Dec 2, 2025 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 Oct 10, 2025

OpenResty XRay Updated Oct 10, 2025 4 mins read

Building a Non-Invasive Java Function Profiler with OpenResty XRay

openresty-xray java probe
  • What is Non-Intrusive Function Probing?
  • What Makes OpenResty XRay’s Non-Intrusive Probes Unique?
  • Hands-on Demo: Monitoring Function Parameters
  • Technical Advantages and Use Cases
  • What is Non-Intrusive Function Probing?
  • What Makes OpenResty XRay’s Non-Intrusive Probes Unique?
  • Hands-on Demo: Monitoring Function Parameters
  • Technical Advantages and Use Cases

OpenResty XRay Sep 23, 2025

OpenResty XRay Updated Sep 23, 2025 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 Sep 2, 2025

OpenResty XRay Updated Sep 2, 2025 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 Oct 14, 2025

OpenResty XRay Updated Oct 14, 2025 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 10, 2025

OpenResty XRay Updated Jul 10, 2025 10 mins read

How OpenResty XRay Thoroughly Analyzes Nginx Memory Corruption Issues

casestudy openresty-xray undo coredump memory nginx
  • A Nginx Crash Case That Kept the Operations Team Up All Night
  • How to Use OpenResty XRay to Precisely Capture the First Scene of Memory Corruption
  • How Secondary Development Accidentally Broke Nginx’s Lifecycle Management
  • A Nginx Crash Case That Kept the Operations Team Up All Night
  • How to Use OpenResty XRay to Precisely Capture the First Scene of Memory Corruption
  • How Secondary Development Accidentally Broke Nginx’s Lifecycle Management

OpenResty XRay May 23, 2025

OpenResty XRay Updated May 23, 2025 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 May 23, 2025

OpenResty XRay Updated May 23, 2025 5 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 Jul 8, 2025

OpenResty XRay Updated Jul 8, 2025 6 mins read

Case Study: How to Trace a Memory Leak Caused by an LRU Cache Using OpenResty XRay

casestudy openresty-xray lru memory
  • The Silent Killer: How Invisible Memory Leaks Threaten Business Stability
  • A Deep Dive into a Memory Leak Investigation
  • From Predicament to Breakthrough: A Pinpoint Diagnosis
  • The Silent Killer: How Invisible Memory Leaks Threaten Business Stability
  • A Deep Dive into a Memory Leak Investigation
  • From Predicament to Breakthrough: A Pinpoint Diagnosis

OpenResty XRay Jul 2, 2025

OpenResty XRay Updated Jul 2, 2025 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 Jul 2, 2025

OpenResty XRay Updated Jul 2, 2025 10 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 Oct 14, 2025

OpenResty XRay Updated Oct 14, 2025 11 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 17, 2025

OpenResty XRay Updated Jun 17, 2025 10 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 17, 2025

OpenResty XRay Updated Jun 17, 2025 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 17, 2025

OpenResty XRay Updated Jun 17, 2025 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 17, 2025

OpenResty XRay Updated Jun 17, 2025 10 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 17, 2025

OpenResty XRay Updated Jun 17, 2025 6 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 17, 2025

OpenResty XRay Updated Jun 17, 2025 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 Jun 17, 2025

OpenResty XRay Updated Jun 17, 2025 9 mins read

Analyzing CPU, off-CPU and Disk I/O Usage of Java Applications (Using OpenResty XRay)

openresty-xray java memory cpu
  • High CPU usage issues in Java applications
  • CPU blocking issues in Java applications
  • High disk I/O issues in Java applications
  • Supported Java versions and operating systems
  • Performance impact and overhead
  • Future plans
Photo by Yichun Zhang
  • High CPU usage issues in Java applications
  • CPU blocking issues in Java applications
  • High disk I/O issues in Java applications
  • Supported Java versions and operating systems
  • Performance impact and overhead
  • Future plans

OpenResty XRay Jun 17, 2025

OpenResty XRay Updated Jun 17, 2025 7 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 Jun 17, 2025

OpenResty XRay Updated Jun 17, 2025 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 17, 2025

OpenResty XRay Updated Jun 17, 2025 7 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 17, 2025

OpenResty XRay Updated Jun 17, 2025 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 17, 2025

OpenResty XRay Updated Jun 17, 2025 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 17, 2025

OpenResty XRay Updated Jun 17, 2025 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 17, 2025

OpenResty XRay Updated Jun 17, 2025 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 17, 2025

OpenResty XRay Updated Jun 17, 2025 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 Jun 17, 2025

OpenResty XRay Updated Jun 17, 2025 6 mins read

Pinpointing the Hottest Go Code Paths with High Disk I/O (using OpenResty XRay)

tutorial openresty-xray go golang disk I/O
  • Problem: high disk I/O
  • Use the guidede analysis feature of OpenResty XRay to spot the problematic Go code paths
  • Automatic analysis and reports
  • What is OpenResty XRay
  • Problem: high disk I/O
  • Use the guidede analysis feature of OpenResty XRay to spot the problematic Go code paths
  • Automatic analysis and reports
  • What is OpenResty XRay

OpenResty XRay Jun 17, 2025

OpenResty XRay Updated Jun 17, 2025 6 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 17, 2025

OpenResty XRay Updated Jun 17, 2025 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 17, 2025

OpenResty XRay Updated Jun 17, 2025 5 mins read

Performance Overhead of OpenResty XRay when Tracing Go Apps

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 17, 2025

OpenResty XRay Updated Jun 17, 2025 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 17, 2025

OpenResty XRay Updated Jun 17, 2025 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 17, 2025

OpenResty XRay Updated Jun 17, 2025 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 Jun 17, 2025

OpenResty XRay Updated Jun 17, 2025 5 mins read

Performance Impact of OpenResty XRay when Tracing Python Apps (using OpenResty XRay)

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 Jun 17, 2025

OpenResty XRay Updated Jun 17, 2025 5 mins read

Find the largest Python objects or values taking the most RAM (using OpenResty XRay)

tutorial openresty-xray python memory
  • Problem: high memory usage
  • Use the guided analysis feature of OpenResty XRay to find the largest Python objects or values taking the most RAM
  • Automatic analysis and reports
  • What is OpenResty XRay
  • Problem: high memory usage
  • Use the guided analysis feature of OpenResty XRay to find the largest Python objects or values taking the most RAM
  • Automatic analysis and reports
  • What is OpenResty XRay

OpenResty XRay Jun 17, 2025

OpenResty XRay Updated Jun 17, 2025 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 Jun 17, 2025

OpenResty XRay Updated Jun 17, 2025 7 mins read

Analyzing Tomcat Java Web Application Request Latency (Using OpenResty XRay)

openresty-xray java tomcat latency performance
  • Analyzing Tomcat Java Web application request latency
  • Flexible filtering conditions for request capture
  • Detailed request information capture
  • PCAP packet capture functionality
  • Practical application examples
Photo by Yichun Zhang
  • Analyzing Tomcat Java Web application request latency
  • Flexible filtering conditions for request capture
  • Detailed request information capture
  • PCAP packet capture functionality
  • Practical application examples

OpenResty XRay Jun 17, 2025

OpenResty XRay Updated Jun 17, 2025 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 17, 2025

OpenResty XRay Updated Jun 17, 2025 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 Jun 17, 2025

OpenResty XRay Updated Jun 17, 2025 5 mins read

Locate Large Memory Objects inside Perl Processes (using OpenResty XRay)

tutorial openresty-xray perl memory
  • Problem: high memory usage
  • Use the guided analysis feature of OpenResty XRay to find the largest Perl objects or values taking the most RAM
  • Automatic analysis and reports
  • What is OpenResty XRay
  • Problem: high memory usage
  • Use the guided analysis feature of OpenResty XRay to find the largest Perl objects or values taking the most RAM
  • Automatic analysis and reports
  • What is OpenResty XRay

OpenResty XRay Jun 17, 2025

OpenResty XRay Updated Jun 17, 2025 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 Jun 17, 2025

OpenResty XRay Updated Jun 17, 2025 5 mins read

Performance Impact of OpenResty XRay when Tracing Rust Apps (using OpenResty XRay)

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 17, 2025

OpenResty XRay Updated Jun 17, 2025 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 17, 2025

OpenResty XRay Updated Jun 17, 2025 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 Jun 17, 2025

OpenResty XRay Updated Jun 17, 2025 6 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 Jun 17, 2025

OpenResty XRay Updated Jun 17, 2025 6 mins read

How to Diagnose HTTP 504 Timeout Errors using OpenResty XRay

tutorial openresty-xray 504 timeout
  • Problem: HTTP 504 gateway timeout errors
  • Use the guidede analysis feature of OpenResty XRay to diagnose these errors
  • Automatic analysis and reports
  • What is OpenResty XRay
  • Problem: HTTP 504 gateway timeout errors
  • Use the guidede analysis feature of OpenResty XRay to diagnose these errors
  • Automatic analysis and reports
  • What is OpenResty XRay

OpenResty XRay Jun 17, 2025

OpenResty XRay Updated Jun 17, 2025 6 mins read

How Python Django's Application Uses Memory Internally (Using OpenResty XRay)

tutorial openresty-xray python memory django
  • Problem: high memory usage
  • Use the guidede analysis feature of OpenResty XRay to analyze the django application
  • Automatic analysis and reports
  • What is OpenResty XRay
  • Problem: high memory usage
  • Use the guidede analysis feature of OpenResty XRay to analyze the django application
  • Automatic analysis and reports
  • What is OpenResty XRay

OpenResty XRay Jun 17, 2025

OpenResty XRay Updated Jun 17, 2025 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 Jun 17, 2025

OpenResty XRay Updated Jun 17, 2025 8 mins read

Real-Time Request Counting against Nginx Processes via YSQL

openresty-xray ysql nginx openresty
  • 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 17, 2025

OpenResty XRay Updated Jun 17, 2025 11 mins read

Tracing the Slowest PCRE Regular Expressions in OpenResty or Nginx Processes

openresty 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 17, 2025

OpenResty XRay Updated Jun 17, 2025 9 mins read

Listing Loaded Lua Modules in OpenResty or Nginx Processes

ylua openresty-xray openresty 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 17, 2025

OpenResty XRay Updated Jun 17, 2025 12 mins read

Analyzing the Most CPU-Consuming Requests in OpenResty or Nginx

openresty 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 Jun 17, 2025

OpenResty XRay Updated Jun 17, 2025 14 mins read

Ylang: Universal Language for eBPF, Stap+, GDB, and More (Part 4 of 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 Jun 17, 2025

OpenResty XRay Updated Jun 17, 2025 10 mins read

Ylang: Universal Language for eBPF, Stap+, GDB, and More (Part 3 of 4)

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 Jun 17, 2025

OpenResty XRay Updated Jun 17, 2025 16 mins read

The LuaJIT GC64 Mode

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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