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bitesize_example.txt
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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.