Analyzer java-read-fgraph

# Name

java-read-fgraph - Java-Land Virtual File System Read/Sendfile Flame Graph

This analyzer profiles virtual file system read and sendfile operations in Java-land code execution within JVM applications. It captures stack traces and call counts for file read and sendfile system calls. The analyzer generates flame graphs that visualize the frequency of file read operations across different code paths, helping identify excessive file I/O, inefficient read patterns, and disk access bottlenecks in Java applications.

# Resource Category

Disk I/O.

# Application Type & Technical Stack

• Java

# 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 java-read-fgraph -p PID

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

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

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