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Examples of bitesize.py, the Linux bcc/eBPF version.
The aim of this tool is to show I/O distribution for requested block sizes, by process name.
# ./bitesize.py
Tracing... Hit Ctrl-C to end.
^C
Process Name = 'kworker/u128:1'
Kbytes : count distribution
0 -> 1 : 1 |******************** |
2 -> 3 : 0 | |
4 -> 7 : 2 |****************************************|
Process Name = 'bitesize.py'
Kbytes : count distribution
0 -> 1 : 0 | |
2 -> 3 : 0 | |
4 -> 7 : 0 | |
8 -> 15 : 0 | |
16 -> 31 : 0 | |
32 -> 63 : 0 | |
64 -> 127 : 0 | |
128 -> 255 : 1 |****************************************|
Process Name = 'dd'
Kbytes : count distribution
0 -> 1 : 3 | |
2 -> 3 : 0 | |
4 -> 7 : 6 | |
8 -> 15 : 0 | |
16 -> 31 : 1 | |
32 -> 63 : 1 | |
64 -> 127 : 0 | |
128 -> 255 : 0 | |
256 -> 511 : 1 | |
512 -> 1023 : 0 | |
1024 -> 2047 : 488 |****************************************|
Process Name = 'jbd2/dm-1-8'
Kbytes : count distribution
0 -> 1 : 0 | |
2 -> 3 : 0 | |
4 -> 7 : 1 |****************************************|
Process Name = 'cat'
Kbytes : count distribution
0 -> 1 : 1 | |
2 -> 3 : 0 | |
4 -> 7 : 0 | |
8 -> 15 : 0 | |
16 -> 31 : 0 | |
32 -> 63 : 1 | |
64 -> 127 : 0 | |
128 -> 255 : 0 | |
256 -> 511 : 1924 |****************************************|
Process Name = 'ntpd'
Kbytes : count distribution
0 -> 1 : 0 | |
2 -> 3 : 0 | |
4 -> 7 : 104 |****************************************|
Process Name = 'vmtoolsd'
Kbytes : count distribution
0 -> 1 : 0 | |
2 -> 3 : 0 | |
4 -> 7 : 1 |****************************************|
Process Name = 'bash'
Kbytes : count distribution
0 -> 1 : 0 | |
2 -> 3 : 0 | |
4 -> 7 : 0 | |
8 -> 15 : 0 | |
16 -> 31 : 2 |****************************************|
Process Name = 'jbd2/sdb-8'
Kbytes : count distribution
0 -> 1 : 0 | |
2 -> 3 : 0 | |
4 -> 7 : 1 |****************************************|
8 -> 15 : 0 | |
16 -> 31 : 0 | |
32 -> 63 : 1 |****************************************|
We can see from above that there was a dd command being run which generated 488 IOPS between 1MB and 2MB, we can also see the
cat command generating 1924 IOPS between 256Kb and 512Kb.