Analyzer lj-lua-newstr

# Name

lj-lua-newstr - LuaJIT String Objects Allocation Flame Graph

This analyzer profiles string object allocations in LuaJIT-based applications such as OpenResty, Kong, and APISIX. It captures stack traces whenever new string objects are created in Lua-land code. The analyzer generates flame graphs that visualize the distribution of string allocation hotspots across Lua function calls, helping identify excessive string creation patterns that may impact memory usage and garbage collection 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-newstr -p PID

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

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

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