Analyzer vfs-read-fgraph

# Name

vfs-read-fgraph - Virtual File System Read/Sendfile Flame Graph

This analyzer profiles file read operations including sendfile across all applications. It captures stack traces during VFS read operations and counts operation frequency. The analyzer generates flame graphs showing code paths performing file reads, helping identify read-intensive operations and optimize file access patterns.

# Resource Category

Disk I/O.

# 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 vfs-read-fgraph -p PID

# trace a shell command directly
orxray analyzer run vfs-read-fgraph -c SHELL_CMD

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

# trace any processes started from the specified executable path.
orxray analyzer run vfs-read-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.