bcc-bitesize - Man Page
Summarize block device I/O size as a histogram — Linux eBPF/bcc.
Synopsis
bitesize
Description
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.
Author
Allan McAleavy
See Also
https://github.com/brendangregg/systemtap-lwtools/blob/master/disk/bitesize-nd.stp