Analyzer epoll-wait-timers-fgraph

# Name

epoll-wait-timers-fgraph - Wait timers flamegraph for epoll

This analyzer generates flame graph visualizations of wait timer behavior in epoll-based event loops across all application types. It captures stack traces during epoll_wait operations with full stack unwinding, showing the code paths leading to event loop waiting. The flame graph visualization helps identify which components or operations are causing the event loop to wait, enabling targeted optimization of asynchronous I/O patterns.

# Resource Category

CPU.

# Application Type & Technical Stack

• All

# 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 epoll-wait-timers-fgraph -p PID

# trace a shell command directly
orxray analyzer run epoll-wait-timers-fgraph -c SHELL_CMD

# PGID is the process group ID or any process's PID within the target process
# group.
orxray analyzer run epoll-wait-timers-fgraph -p -PGID

# trace any processes started from the specified executable path.
orxray analyzer run epoll-wait-timers-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.