bitesize(8) | System Manager's Manual | bitesize(8) |
bitesize - Summarize block device I/O size as a histogram - Linux eBPF/bcc.
bitesize
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 historgram of I/O size.
Since this uses BPF, only the root user can use this tool.
CONFIG_BPF and bcc.
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.
This is from bcc.
Also look in the bcc distribution for a companion _examples.txt file containing example usage, output, and commentary for this tool.
Linux
Unstable - in development.
Allan McAleavy
https://github.com/brendangregg/systemtap-lwtools/blob/master/disk/bitesize-nd.stp
2016-02-05 | USER COMMANDS |