Analyzer vfs-write-latency-top-files

# Name

vfs-write-latency-top-files - Virtual File System Write Latency Top N files

This analyzer identifies files with the highest write latency across all applications. It captures file write operations and measures their latency. The analyzer generates bar charts ranking files by cumulative write latency, helping identify slow write operations and troubleshoot storage performance bottlenecks.

# 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-write-latency-top-files -p PID

# trace a shell command directly
orxray analyzer run vfs-write-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-write-latency-top-files -p -PGID

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

# Tracing Multiple Processes

Supported.

# Output Formats

• Tables
• Plain Texts

# Output Example

[
  {
    "data": [
      [
        "file",
        "latency(us)"
      ],
      [
        "/usr/local/openresty/proxy_cache/6/93/dfc5f9ede0efdfc2643848c875caf936",
        "1513"
      ]
    ],
    "title": "vfs read latency top files(total samples: 145, total files: 40, total latency: 3596 us)",
    "type": "table",
    "ver": 1
  }
]

# Author

The OpenResty Inc. Team.

# Copyright

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