OpenResty's Official Blog for Technologies & Products

OpenResty XRay Aug 24, 2026

OpenResty XRay Updated Aug 24, 2026 5 mins read

Perl Memory Leak: From Several GB to 60MB with One Flame Graph

tutorial openresty-xray perl memory

• Pinpointing Memory Leak Root Causes with a Flame Graph
• Significant Optimization Achievements
• Further Reading
• Summary

OpenResty XRay Jun 26, 2026

OpenResty XRay Updated Jun 26, 2026 8 mins read

How UDB and OpenResty XRay Let You See Through the Entire Perl Code Execution Process

openresty-xray undo perl udb

• What is UDB?
• Hands-on: Analyzing Perl Application Call Stacks with OpenResty XRay and UDB
• Why More Developers Are Choosing UDB?
• Summary

OpenResty XRay Aug 24, 2026

OpenResty XRay Updated Aug 24, 2026 6 mins read

How to Trace Perl Exceptions in Production Without Restarting

tutorial openresty-xray perl exceptions

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

OpenResty XRay Aug 24, 2026

OpenResty XRay Updated Aug 24, 2026 7 mins read

Perl Process Stuck at 13% CPU: Off-CPU Flame Graphs Pinpoint a Blocking HTTP Call

tutorial openresty-xray perl off-cpu

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

OpenResty XRay Aug 24, 2026

OpenResty XRay Updated Aug 24, 2026 7 mins read

Performance Overhead of OpenResty XRay when Tracing Perl Apps

tutorial openresty-xray perl 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

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

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