bitesize-bpfcc8
Summarize block device i/o size as a histogram - linux ebpf/bcc.
Usage
bitesize
Overview
Show I/O distribution for requested block sizes, by process name.
This works by tracing block:block_rq_issue and prints a histogram of I/O size.
Since this uses BPF, only the root user can use this tool.
Requirements
CONFIG_BPF and bcc.
Examples
- Count I/O size per process until Ctrl-C is hit:
-
#
bitesize
Fields
Kbtes
|
Size in kilobytes of range |
|---|---|
count
|
How many I/O fell into this range |
distribution
|
An ASCII bar chart to visualize the distribution (count column) |
Overhead
This traces a block I/O tracepoint to update a histogram, which is asynchronously copied to user-space. This method is very efficient, and the overhead for most storage I/O rates (< 10k IOPS) should be negligible. If you have a higher IOPS storage environment, test and quantify the overhead before use.
Source
This is from bcc.
-
https://github.com/iovisor/bcc
Also look in the bcc distribution for a companion _examples.txt file containing example usage, output, and commentary for this tool.
OS
Linux
Stability
Unstable - in development.
Releases
4 releases since Debian 10 (Buster); the text changed 2 times.