Analyzer ngx-pcre-compile-lua-fgraph

# Name

ngx-pcre-compile-lua-fgraph - Openresty New PCRE Compilation Lua Land Flame Graph

This analyzer profiles PCRE (Perl Compatible Regular Expressions) compilation operations in Lua-land code within OpenResty, Kong, and APISIX applications. It captures stack traces during regular expression compilation, generating flame graphs that visualize CPU time distribution across Lua-level function calls involved in PCRE compilation. This helps identify performance bottlenecks caused by frequent or complex regex compilation patterns.

# Resource Category

CPU.

# Application Type & Technical Stack

• OpenResty
• Kong
• APISIX

# Command Line Syntax

The analyzer can be invoked directly on the command-line via the orxray utility from the openresty-xray-cli software package.

Alternatively, the analyzer can also be invoked manually or automatically on the web console UI of OpenResty XRay (like on the Advanced web page).

# PID is the target process PID.
orxray analyzer run ngx-pcre-compile-lua-fgraph -p PID

# trace a shell command directly
orxray analyzer run ngx-pcre-compile-lua-fgraph -c SHELL_CMD

# PGID is the process group ID or any process's PID within the target process
# group.
orxray analyzer run ngx-pcre-compile-lua-fgraph -p -PGID

# trace any processes started from the specified executable path.
orxray analyzer run ngx-pcre-compile-lua-fgraph --exe /path/to/exe/file

# Tracing Multiple Processes

Supported.

# Output Formats

• Flame Graphs

# Author

The OpenResty Inc. Team.

# Copyright

Copyright (C) by OpenResty Inc. All rights reserved.