Analyzer lj-lua-tab-resize

# Name

lj-lua-tab-resize - LuaJIT Table resize Flame Graph

This analyzer profiles memory allocation patterns in LuaJIT-based applications by tracing Lua table resize operations. It captures stack traces whenever LuaJIT resizes table structures in applications such as OpenResty, Kong, and APISIX. The analyzer generates flame graphs that visualize the call paths leading to table resizing events, helping identify inefficient table usage patterns, excessive memory reallocations, and opportunities for pre-sizing tables to improve performance.

# 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-tab-resize -p PID

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

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

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