Featured Articles

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

How a Single "0" Took Down Bilibili — Every Server at 100% CPU, and Reboots Didn't Help

How a Single "0" Took Down Bilibili — Every Server at 100% CPU, and Reboots Didn't Help

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

Nginx Reverse Proxy QPS Dropped 15x: A Missing upstream keepalive and an -O0 Debug Build
openresty-xray
...
case-study lua nginx off-cpu
4 mins read

Nginx Reverse Proxy QPS Dropped 15x: A Missing upstream keepalive and an -O0 Debug Build

Nginx Reverse Proxy QPS Dropped 15x: A Missing upstream keepalive and an -O0 Debug Build

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

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Latest Articles

OpenResty XRay Aug 24, 2026

OpenResty XRay Updated Aug 24, 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 Aug 24, 2026

OpenResty XRay Updated Aug 24, 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 Aug 24, 2026

OpenResty XRay Updated Aug 24, 2026 3 mins read

Performance Impact of OpenResty XRay when Tracing PHP Apps

tutorial openresty-xray php overhead
  • What Happens to CPU, Memory, and Load During Profiling?
  • How Much Does Profiling Affect Throughput and Latency?
  • OpenResty XRay vs. Always-On APM Agents
  • FAQ
  • What Happens to CPU, Memory, and Load During Profiling?
  • How Much Does Profiling Affect Throughput and Latency?
  • OpenResty XRay vs. Always-On APM Agents
  • FAQ

OpenResty XRay Aug 24, 2026

OpenResty XRay Updated Aug 24, 2026 7 mins read

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

tutorial openresty-xray rust overhead
  • What Happens to CPU, Memory, and Load During Profiling?
  • How Much Does Profiling Affect Throughput and Latency?
  • OpenResty XRay vs. Always-On APM Agents
  • FAQ
  • What Happens to CPU, Memory, and Load During Profiling?
  • How Much Does Profiling Affect Throughput and Latency?
  • OpenResty XRay vs. Always-On APM Agents
  • FAQ

OpenResty XRay Aug 24, 2026

OpenResty XRay Updated Aug 24, 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

OpenResety Edge Jun 26, 2026

OpenResety Edge Updated Jun 26, 2026 4 mins read

Adding Custom Response Headers in OpenResty Edge

tutorial openresty-edge
  • Add New Respond Header and Use String As Value
  • Use “System Hostname” As a Built-in Variable for Value
  • Add New Respond Header and Use String As Value
  • Use “System Hostname” As a Built-in Variable for Value

OpenResty XRay Aug 24, 2026

OpenResty XRay Updated Aug 24, 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 Aug 24, 2026

OpenResty XRay Updated Aug 24, 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 Aug 24, 2026

OpenResty XRay Updated Aug 24, 2026 6 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 Aug 24, 2026

OpenResty XRay Updated Aug 24, 2026 7 mins read

Rust CPU Profiling: Find the Hottest Code Paths in Sled with OpenResty XRay

tutorial openresty-xray cpu sled rust profiling flame-graph
  • The problem: a Sled-based cache service using over 100% CPU
  • Profile the running Rust process with Guided Analysis
  • Read the Rust CPU flame graph: the #1 hottest code path
  • The #2 hottest code path: get_inner and view_for_key
  • Automatic Rust CPU analysis reports
  • Frequently asked questions
  • The problem: a Sled-based cache service using over 100% CPU
  • Profile the running Rust process with Guided Analysis
  • Read the Rust CPU flame graph: the #1 hottest code path
  • The #2 hottest code path: get_inner and view_for_key
  • Automatic Rust CPU analysis reports
  • Frequently asked questions

OpenResty XRay Aug 24, 2026

OpenResty XRay Updated Aug 24, 2026 7 mins read

etcd High CPU Usage: Find the Hottest Go Code Paths with Flame Graphs

tutorial openresty-xray go cpu etcd
  • Symptom: etcd consuming over 70% of a CPU core
  • Use OpenResty XRay Guided Analysis to find the hottest Go code paths
  • Automatic etcd CPU monitoring and reports
  • What is OpenResty XRay
  • Symptom: etcd consuming over 70% of a CPU core
  • Use OpenResty XRay Guided Analysis to find the hottest Go code paths
  • Automatic etcd CPU monitoring and reports
  • What is OpenResty XRay

OpenResty XRay Aug 24, 2026

OpenResty XRay Updated Aug 24, 2026 7 mins read

llama.cpp CPU Usage: 400% CPU Traced to ggml Hot Functions

tutorial openresty-xray llm cpu generative-ai llama2 llama.cpp profiling ai
  • Running llama.cpp and Observing 400% CPU Usage
  • Profiling llama.cpp CPU Usage with OpenResty XRay
  • Findings: The Hottest C++ Code Paths
  • What is OpenResty XRay
  • Running llama.cpp and Observing 400% CPU Usage
  • Profiling llama.cpp CPU Usage with OpenResty XRay
  • Findings: The Hottest C++ Code Paths
  • What is OpenResty XRay

OpenResty XRay Aug 14, 2026

OpenResty XRay Updated Aug 14, 2026 5 mins read

Go Off-CPU Analysis: Tracing a Running Process Stuck at 2% CPU to a Blocking Shell Call

tutorial openresty-xray go cpu
  • The symptom: Go service CPU usage stays low under load
  • Running off-CPU analysis on the live Go process with OpenResty XRay
  • Root cause: a blocking shell command at a single source line
  • Automatic analysis and reports
  • The symptom: Go service CPU usage stays low under load
  • Running off-CPU analysis on the live Go process with OpenResty XRay
  • Root cause: a blocking shell command at a single source line
  • Automatic analysis and reports
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