Analyzer lj-lua-newfunc

# Name

lj-lua-newfunc - Lua-Land New Function Creation Flame Graph sampling Tool for LuaJIT Applications.

This analyzer profiles Lua function object creation in LuaJIT-based applications such as OpenResty, Kong, and APISIX. It captures stack traces at function instantiation points in Lua-land code, tracking dynamic function creation patterns and closure allocation behavior. The analyzer generates flame graphs that visualize function creation distribution across call chains, helping identify excessive function object allocation and optimize closure usage.

# 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-newfunc -p PID

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

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

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