1 Examples of bitesize.py, the Linux bcc/eBPF version. 2 3 4 The aim of this tool is to show I/O distribution for requested block sizes, by process name. 5 6 # ./bitesize.py 7 Tracing... Hit Ctrl-C to end. 8 ^C 9 10 Process Name = 'kworker/u128:1' 11 Kbytes : count distribution 12 0 -> 1 : 1 |******************** | 13 2 -> 3 : 0 | | 14 4 -> 7 : 2 |****************************************| 15 16 Process Name = 'bitesize.py' 17 Kbytes : count distribution 18 0 -> 1 : 0 | | 19 2 -> 3 : 0 | | 20 4 -> 7 : 0 | | 21 8 -> 15 : 0 | | 22 16 -> 31 : 0 | | 23 32 -> 63 : 0 | | 24 64 -> 127 : 0 | | 25 128 -> 255 : 1 |****************************************| 26 27 Process Name = 'dd' 28 Kbytes : count distribution 29 0 -> 1 : 3 | | 30 2 -> 3 : 0 | | 31 4 -> 7 : 6 | | 32 8 -> 15 : 0 | | 33 16 -> 31 : 1 | | 34 32 -> 63 : 1 | | 35 64 -> 127 : 0 | | 36 128 -> 255 : 0 | | 37 256 -> 511 : 1 | | 38 512 -> 1023 : 0 | | 39 1024 -> 2047 : 488 |****************************************| 40 41 Process Name = 'jbd2/dm-1-8' 42 Kbytes : count distribution 43 0 -> 1 : 0 | | 44 2 -> 3 : 0 | | 45 4 -> 7 : 1 |****************************************| 46 47 Process Name = 'cat' 48 Kbytes : count distribution 49 0 -> 1 : 1 | | 50 2 -> 3 : 0 | | 51 4 -> 7 : 0 | | 52 8 -> 15 : 0 | | 53 16 -> 31 : 0 | | 54 32 -> 63 : 1 | | 55 64 -> 127 : 0 | | 56 128 -> 255 : 0 | | 57 256 -> 511 : 1924 |****************************************| 58 59 Process Name = 'ntpd' 60 Kbytes : count distribution 61 0 -> 1 : 0 | | 62 2 -> 3 : 0 | | 63 4 -> 7 : 104 |****************************************| 64 65 Process Name = 'vmtoolsd' 66 Kbytes : count distribution 67 0 -> 1 : 0 | | 68 2 -> 3 : 0 | | 69 4 -> 7 : 1 |****************************************| 70 71 Process Name = 'bash' 72 Kbytes : count distribution 73 0 -> 1 : 0 | | 74 2 -> 3 : 0 | | 75 4 -> 7 : 0 | | 76 8 -> 15 : 0 | | 77 16 -> 31 : 2 |****************************************| 78 79 Process Name = 'jbd2/sdb-8' 80 Kbytes : count distribution 81 0 -> 1 : 0 | | 82 2 -> 3 : 0 | | 83 4 -> 7 : 1 |****************************************| 84 8 -> 15 : 0 | | 85 16 -> 31 : 0 | | 86 32 -> 63 : 1 |****************************************| 87 88 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 89 cat command generating 1924 IOPS between 256Kb and 512Kb. 90
