Analyzer vfs-read-latency-top-files

# Name

vfs-read-latency-top-files - Virtual File System Read Latency Top N files (including sendfile)

This analyzer identifies files with the highest read latency across all applications. It captures file read operations including sendfile calls and measures their latency. The analyzer generates bar charts ranking files by cumulative read latency, helping identify slow storage access patterns and troubleshoot I/O performance issues.

# 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-latency-top-files -p PID

# trace a shell command directly
orxray analyzer run vfs-read-latency-top-files -c SHELL_CMD

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

# trace any processes started from the specified executable path.
orxray analyzer run vfs-read-latency-top-files --exe /path/to/exe/file

# Tracing Multiple Processes

Supported.

# Output Formats

• Bar Charts
• Plain Texts

# Author

The OpenResty Inc. Team.

# Copyright

Copyright (C) by OpenResty Inc. All rights reserved.