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

OpenResty Edge Oct 8, 2026

OpenResty Edge Updated Oct 8, 2026 12 mins read

Multi-Provider DNS Redundancy: Stay Online When a DNS Provider Fails, Geo-Routing Intact

openresty-edge dns
  • Why multi-provider DNS often means giving up intelligent routing
  • How OpenResty Edge adds DNS redundancy: primary for intelligent routing, secondary providers as fallback
  • Which zones suit this multi-provider DNS setup
  • Frequently asked questions
  • Why multi-provider DNS often means giving up intelligent routing
  • How OpenResty Edge adds DNS redundancy: primary for intelligent routing, secondary providers as fallback
  • Which zones suit this multi-provider DNS setup
  • Frequently asked questions

OpenResty XRay Sep 18, 2026

OpenResty XRay Updated Sep 18, 2026 11 mins read

From AI Flame Graph Analysis to Verified Fixes: A Coding-Agent Optimization Loop with OpenResty XRay

openresty-xray ai analyzer cpu lua
  • Prerequisite: OpenResty XRay must already be installed on the target machine
  • Your coding agent isn’t short on intelligence—it’s short on runtime visibility
  • Three optimization rounds: 336 → 4,457 → 26,028 → 29,968 RPS
  • Lua + C, two perspectives: why you shouldn’t try to optimize writev
  • FAQ
  • Prerequisite: OpenResty XRay must already be installed on the target machine
  • Your coding agent isn’t short on intelligence—it’s short on runtime visibility
  • Three optimization rounds: 336 → 4,457 → 26,028 → 29,968 RPS
  • Lua + C, two perspectives: why you shouldn’t try to optimize writev
  • FAQ

OpenResty XRay Aug 28, 2026

OpenResty XRay Updated Aug 28, 2026 17 mins read

Flame Graphs: How to Read a CPU Flame Graph and Find the Code Burning Your CPU

tutorial flame-graph cpu profiling openresty-xray performance
  • What is a flame graph: definition, axes, and the four rules
  • How to read a flame graph: plateaus, towers, hair, and self vs total
  • Three real production flame graphs: PHP preg_match, Go regexp.MustCompile, Erlang erts_pcre_exec
  • From 100% CPU to the culprit line: a four-step workflow with a per-stack routing table
  • How to get a flame graph for your stack
  • Icicle graphs, flame charts, and other variants
  • Can AI read flame graphs for you?
  • What is a flame graph: definition, axes, and the four rules
  • How to read a flame graph: plateaus, towers, hair, and self vs total
  • Three real production flame graphs: PHP preg_match, Go regexp.MustCompile, Erlang erts_pcre_exec
  • From 100% CPU to the culprit line: a four-step workflow with a per-stack routing table
  • How to get a flame graph for your stack
  • Icicle graphs, flame charts, and other variants
  • Can AI read flame graphs for you?

OpenResty XRay Aug 28, 2026

OpenResty XRay Updated Aug 28, 2026 17 mins read

P99 Latency: Why Averages Lie, and How to Diagnose the Slowest 1%

openresty-xray p99 latency performance flame-graph
  • What is P99 latency?
  • P50 vs P95 vs P99: what each percentile tells you
  • Why average latency lies
  • Why is P99 latency high? A root-cause spectrum
  • How to diagnose high P99 latency
  • How to reduce P99 latency: fix what you found
  • Summary
  • Frequently Asked Questions
  • What is P99 latency?
  • P50 vs P95 vs P99: what each percentile tells you
  • Why average latency lies
  • Why is P99 latency high? A root-cause spectrum
  • How to diagnose high P99 latency
  • How to reduce P99 latency: fix what you found
  • Summary
  • Frequently Asked Questions

OpenResty XRay Aug 28, 2026

OpenResty XRay Updated Aug 28, 2026 14 mins read

Memory Leak Detection in Production: From RSS Curve to Source Line

openresty-xray memory tutorial
  • The Symptom: A Memory Curve That Only Goes Up
  • Memory Leak or Just High Memory Usage?
  • Four Leak Patterns with Real Root-Cause Chains
  • It Looks Like a Leak, but It Isn’t
  • How to Locate a Leak: Top-Down Layered Attribution
  • Why Traditional Tools Fall Short in Production
  • Frequently Asked Questions
  • The Symptom: A Memory Curve That Only Goes Up
  • Memory Leak or Just High Memory Usage?
  • Four Leak Patterns with Real Root-Cause Chains
  • It Looks Like a Leak, but It Isn’t
  • How to Locate a Leak: Top-Down Layered Attribution
  • Why Traditional Tools Fall Short in Production
  • Frequently Asked Questions

OpenResty XRay Aug 28, 2026

OpenResty XRay Updated Aug 28, 2026 11 mins read

Off-CPU Analysis: Four Root Causes Behind Low CPU Yet High Latency

openresty-xray off-cpu tutorial
  • What Is Off-CPU Time?
  • The Symptom: CPU Usage Won’t Climb, Yet Requests Are Queuing
  • Four Categories of Off-CPU Root Causes with Real-World Root-Cause Chains
  • How to Quantify Off-CPU Time
  • On-CPU + Off-CPU = Wall-Clock Time: The Bigger Picture and the Tool Ecosystem
  • FAQ
  • What Is Off-CPU Time?
  • The Symptom: CPU Usage Won’t Climb, Yet Requests Are Queuing
  • Four Categories of Off-CPU Root Causes with Real-World Root-Cause Chains
  • How to Quantify Off-CPU Time
  • On-CPU + Off-CPU = Wall-Clock Time: The Bigger Picture and the Tool Ecosystem
  • FAQ

OpenResty Edge Jul 17, 2026

OpenResty Edge Updated Jul 17, 2026 13 mins read

CDN for Live Streaming: Surviving Peak Events Without Peak-Event Bills

openresty-edge cdn live-streaming
  • Why live streams crash at peak: running day-to-day doesn’t mean surviving the peak
  • How a private CDN turns peak stability from probability into certainty
  • Live streaming CDN cost comparison: surviving the peak isn’t paying for the peak
  • The real cost of a private CDN: not the same as building from scratch
  • Beyond delivery: what a live streaming scenario needs from the same gateway layer
  • FAQ
  • Why live streams crash at peak: running day-to-day doesn’t mean surviving the peak
  • How a private CDN turns peak stability from probability into certainty
  • Live streaming CDN cost comparison: surviving the peak isn’t paying for the peak
  • The real cost of a private CDN: not the same as building from scratch
  • Beyond delivery: what a live streaming scenario needs from the same gateway layer
  • FAQ

OpenResty Edge Aug 4, 2026

OpenResty Edge Updated Aug 4, 2026 18 mins read

Building a Self-Hosted Live Streaming CDN for HLS with OpenResty Edge

tutorial openresty-edge cache proxy hls live-streaming
  • Why live HLS breaks a naive caching setup
  • Building it on OpenResty Edge: two page rules with opposite TTLs
  • The most critical step: the Use stale proxy cache action
  • A shield tier with gateway partitions: collapsing to one fetch network-wide
  • Verifying the configuration and load testing
  • FAQ
  • Why live HLS breaks a naive caching setup
  • Building it on OpenResty Edge: two page rules with opposite TTLs
  • The most critical step: the Use stale proxy cache action
  • A shield tier with gateway partitions: collapsing to one fetch network-wide
  • Verifying the configuration and load testing
  • FAQ

OpenResty Open Source Jul 13, 2026

OpenResty Open Source Updated Jul 13, 2026 9 mins read

Install OpenResty - Complete Setup Guide for All Platforms

nginx openresty tutorial install
  • Supported Platforms
  • Quick Start (Ubuntu / Debian)
  • Platform Installation Guides
  • ARM64 / Aarch64
  • Alpine Linux
  • macOS & Building from Source
  • Verify Your Installation
  • FAQ
  • Supported Platforms
  • Quick Start (Ubuntu / Debian)
  • Platform Installation Guides
  • ARM64 / Aarch64
  • Alpine Linux
  • macOS & Building from Source
  • Verify Your Installation
  • FAQ

OpenResty Edge Aug 28, 2026

OpenResty Edge Updated Aug 28, 2026 17 mins read

Do You Need a Service Mesh? When a Centralized Gateway Is Enough

tutorial openresty-edge gateway microservices
  • Do you need a service mesh? When a centralized gateway is the better fit
  • Four pain points of ungoverned east-west traffic
  • Service Mesh vs. centralized gateway: engineering trade-offs
  • Full lifecycle walkthrough: permissions → canary → rollback
  • Three-stage rollout path, real-world results, and FAQ
  • Do you need a service mesh? When a centralized gateway is the better fit
  • Four pain points of ungoverned east-west traffic
  • Service Mesh vs. centralized gateway: engineering trade-offs
  • Full lifecycle walkthrough: permissions → canary → rollback
  • Three-stage rollout path, real-world results, and FAQ

OpenResty Edge Aug 24, 2026

OpenResty Edge Updated Aug 24, 2026 2 mins read

OpenResty Edge Version 26.6.8 Now Available

openresty-edge releases
  • Core Highlights
  • Enhanced Features & Increased Flexibility
  • Improved Usability & Observability
  • Key Fixes and Stability Enhancements
  • How to Upgrade?
  • Core Highlights
  • Enhanced Features & Increased Flexibility
  • Improved Usability & Observability
  • Key Fixes and Stability Enhancements
  • How to Upgrade?
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