Analyzer lj-lua-newgco-size

# Name

lj-lua-newgco-size - LuaJIT GC Object Allocation Size Flame Graph

This analyzer profiles garbage-collectable (GC) object allocations by size in LuaJIT-based applications such as OpenResty, Kong, and APISIX. It captures stack traces during GC object creation and tracks the allocated memory size for each allocation. The analyzer generates flame graphs that visualize memory allocation patterns across Lua function calls, helping identify memory-intensive code paths and optimize memory usage by showing which functions allocate the most memory.

# Resource Category

Memory.

# 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-newgco-size -p PID

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

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

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