Analyzer lj-lua-on-cpu

# Name

lj-lua-on-cpu - Lua-Land CPU Flame Graph

This analyzer profiles CPU usage in Lua-land code execution within LuaJIT-based applications such as OpenResty and Kong. It captures stack traces from Lua functions and coroutines during active CPU execution. The analyzer generates flame graphs that visualize CPU time distribution across Lua-level function calls, helping identify performance bottlenecks in application logic, hot code paths, and inefficient algorithms.

# 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 lj-lua-on-cpu -p PID

# trace a shell command directly
orxray analyzer run lj-lua-on-cpu -c SHELL_CMD

# PGID is the process group ID or any process's PID within the target process
# group.
orxray analyzer run lj-lua-on-cpu -p -PGID

# trace any processes started from the specified executable path.
orxray analyzer run lj-lua-on-cpu --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.