SIMPLE SOLUTIONS

BITESIZE-BPFCC(8) - Linux man page online | Administration and privileged commands

Summarize block device I/O size as a histogram - Linux eBPF/bcc.

Chapter
2016-02-05
bitesize(8) System Manager's Manual bitesize(8)

NAME

bitesize - 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 I/O kernel functions using dynamic tracing and prints a his‐ torgram 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 kernel block I/O functions to update a histgroam, which are 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
USER COMMANDS 2016-02-05 bitesize(8)
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