Analyzer lj-add-timer-lua-fgraph

# Name

lj-add-timer-lua-fgraph - ngx.timer Add Timer Flamegraph

This analyzer profiles the complete execution path when adding timers via ngx.timer APIs in OpenResty and Kong applications. It captures stack traces from Lua-land through the ngx_http_lua or ngx_stream_lua modules into C-land, generating flame graphs that visualize the full call chain. The analyzer helps understand timer creation overhead and identify performance issues in timer setup code.

# 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-add-timer-lua-fgraph -p PID

# trace a shell command directly
orxray analyzer run lj-add-timer-lua-fgraph -c SHELL_CMD

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

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