OpenResty's Official Blog for Technologies & Products

OpenResty XRay Jul 23, 2026

OpenResty XRay Updated Jul 23, 2026 6 mins read

Debugging High Disk I/O in Go Services on Linux

tutorial openresty-xray go golang disk I/O

• Identifying the Go process with high disk I/O
• Tracing Go disk read and write code paths with flame graphs
• Automatic disk I/O analysis and reports
• What is OpenResty XRay
• Frequently Asked Questions

OpenResty XRay Jul 23, 2026

OpenResty XRay Updated Jul 23, 2026 6 mins read

How to Trace Go Panics in Production Without Restarting

tutorial openresty-xray Go Exceptions

• How to detect and analyze exceptions inside live Go applications
• Automatic analysis and reports
• What is OpenResty XRay
• FAQ

OpenResty XRay Aug 20, 2026

OpenResty XRay Updated Aug 20, 2026 7 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 guided analysis feature of OpenResty XRay to spot the CPU-hottest Go code paths
• Automatic analysis and reports
• What is OpenResty XRay

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 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

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 5 mins read

Measuring the Performance Overhead of OpenResty XRay When Profiling Go Applications

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

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 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

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 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

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

OpenResty XRay Aug 20, 2026

OpenResty XRay Updated Aug 20, 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