OpenResty's Official Blog for Technologies & Products

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

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• 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

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• 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 7 mins read

When a "Black Box" Plugin Consumes 45% CPU: How We Pinpointed Lua Line 93 Without Source Code

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• When perf Meets the Black Box
• From Sampling to Full-Stack Dynamic Tracing
• Uncovering the Evidence Trail
• From What happene to Why
• Summary

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 9 mins read

How to Pinpoint the Hidden Cost of Gzip Configuration with OpenResty XRay

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• Performance Issues Often Lurk in Unexpected Places
• How OpenResty XRay Uncovers the Root Cause
• Quantifying Performance Bottlenecks
• From Experience to Methodology

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

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• 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 4 mins read

Double Bottleneck Concurrency? OpenResty XRay Multi-dimensional Analysis Solves Performance Challenges

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• Overall CPU Usage Analysis
• In-depth Module Analysis
• Analysis of Compression Strategies
• Analysis Conclusions
• Optimization Solutions

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

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• 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 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

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• 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

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• 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