OpenResty XRay Aug 24, 2026

OpenResty XRay Updated Aug 24, 2026 6 mins read

Golang High CPU Usage: Regex Compilation Burned 36.8% of CPU Time

tutorial openresty-xray go cpu profiling regex flame-graph

• Observing High CPU Usage in a Go Process
• Profiling Go CPU Usage with OpenResty XRay
• Automatic Monitoring and Reports
• What is OpenResty XRay

OpenResty XRay Aug 14, 2026

OpenResty XRay Updated Aug 14, 2026 6 mins read

Python Process Stuck at 8% CPU: Off-CPU Analysis Traces a Blocking subprocess.run Call

tutorial openresty-xray python off-cpu

• The symptom: Python process CPU usage stays low under heavy requests
• Find the blocking Python code paths with OpenResty XRay’s Guided Analysis
• Automatic analysis and reports in the Insights page
• FAQ
• What is OpenResty XRay
• About The Author

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 5 mins read

Two bugs in Linux kernels' tracing subsystem (found by OpenResty XRay)

openresty-xray dynamic-tracing linux-kernel bugs

• Kernel deadlocks in user-space memory reading
• Data races in x86 breakpoint insertion of the kernel
• What is OpenResty XRay

OpenResty XRay Aug 24, 2026

OpenResty XRay Updated Aug 24, 2026 6 mins read

Perl High CPU Usage: 100% CPU Traced to a Regex Hotspot with Flame Graphs

tutorial openresty-xray perl cpu profiling regex flame-graph dancer2

• Observing 100% CPU Usage in a Perl Process
• Profiling Perl CPU Usage with OpenResty XRay
• Automatic Monitoring and Reports
• What is OpenResty XRay

OpenResty XRay Aug 24, 2026

OpenResty XRay Updated Aug 24, 2026 5 mins read

Lua High CPU Usage: Find the Hottest Lua Code Path in Nginx/OpenResty

tutorial openresty-xray lua cpu flame-graph profiling

• The symptom: an Nginx worker process using almost 100% CPU
• Find the hottest Lua code path with Guided Analysis
• Monitor Lua CPU usage automatically with Insights reports
• Frequently asked questions

OpenResty Open Source Aug 24, 2026

OpenResty Open Source Updated Aug 24, 2026 2 mins read

OpenResty 1.21.4.2 Released

openresty releases

• Version highlights
• Full Changelog
• Feedback

OpenResty XRay Aug 24, 2026

OpenResty XRay Updated Aug 24, 2026 6 mins read

Kong Plugin High CPU Usage: A Hidden Lua Exception Traced with Flame Graphs

openresty-xray exceptions lua kong nginx cpu

• The problem: Kong plugin high CPU usage under light traffic
• Finding the CPU bottleneck with an OpenResty XRay flame graph
• The result: Kong CPU usage cut from 80% to 50%

OpenResty XRay Aug 24, 2026

OpenResty XRay Updated Aug 24, 2026 8 mins read

Kong Plugin Memory and CPU Usage: Find the Top Consumer Online (OpenResty XRay)

openresty-xray kong nginx lua memory cpu

• CPU usage among all Kong plugins in a server process
• Memory usage among all Kong plugins in a server process
• Extra overhead for the servers

OpenResty XRay Aug 14, 2026

OpenResty XRay Updated Aug 14, 2026 6 mins read

TCP Packet Capture on Slow Connections: Tracing a 200ms Nginx Request Body Delay

openresty-xray latency network smart-packet-capture nginx

• The Problem
• Analysis: TCP Packet Capture on Slow Connections
• Fully-automated analysis
• What is OpenResty XRay

OpenResety Edge Jun 26, 2026

OpenResety Edge Updated Jun 26, 2026 4 mins read

EdgeLang: A Powerful and Efficient Language for Gateway Logic

edgelang openresty-edge

• Introduction to Edgelang
• Benefits of Edgelang
• Edgelang in Edge Admin

OpenResty XRay Aug 24, 2026

OpenResty XRay Updated Aug 24, 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

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

OpenResety Edge Jun 26, 2026

OpenResety Edge Updated Jun 26, 2026 2 mins read

Using request IDs to troubleshoot problematic requests in OpenResty Edge gateways

tutorial openresty-edge track requests

• Global configuration Request ID
• Request ID Decoder

OpenResety Edge Aug 10, 2026

OpenResety Edge Updated Aug 10, 2026 5 mins read

How to Enable hCaptcha in OpenResty Edge (Page Rules & WAF)

tutorial openresty-edge hcaptcha

• Configure hCaptcha keys in Global Config
• Enable hCaptcha with a page rule action
• Test the challenge
• Set hCaptcha as the WAF block action

OpenResety Edge Aug 24, 2026

OpenResety Edge Updated Aug 24, 2026 6 mins read

Configuring SNI proxies in OpenResty Edge

tutorial openresty-edge sni proxy

• Create an SNI proxy application
• Create an upstream and a page rule for the application
• Test the SNI proxy application

OpenResety Edge Aug 10, 2026

OpenResety Edge Updated Aug 10, 2026 6 mins read

OpenResty Edge Static Files: Serve Assets from the Gateway with No Back-to-Source

tutorial openresty-edge static resource

• Upload static files to the Global Static File storage
• Create a page rule to serve them directly from the gateway
• Test exact match, directory prefix, and ignored prefix

OpenResety Edge Aug 10, 2026

OpenResety Edge Updated Aug 10, 2026 6 mins read

OpenResty Edge Built-in Captcha: Block Bots at the Gateway with No Backend Changes

tutorial openresty-edge captcha

• Enable the built-in captcha with a page rule
• Test the captcha challenge and clearance time
• Set the built-in captcha as the WAF block action

OpenResety Edge Jun 26, 2026

OpenResety Edge Updated Jun 26, 2026 5 mins read

Configuring gateway access log files in OpenResty Edge

tutorial openresty-edge access log

• Configure access log format on the global config page
• Configure access logs for the sample application
• Test access logs

OpenResety Edge Aug 10, 2026

OpenResety Edge Updated Aug 10, 2026 6 mins read

OpenResty Edge TCP Load Balancing: Proxy TCP Services Without Editing Nginx Config

tutorial openresty-edge proxy

• Create a TCP (stream) application in OpenResty Edge
• Add an upstream and page rule for TCP load balancing
• Test the TCP proxy by connecting to MySQL through an edge node
• Frequently asked questions

OpenResety Edge Jun 26, 2026

OpenResety Edge Updated Jun 26, 2026 6 mins read

Configuring error log files in OpenResty Edge

tutorial openresty-edge error log

• Error logs of the sample application
• Error logs of openresty.com
• Global error logs
• Check error logs on servers