| mcaleavya | 6959dcf | 2016-02-06 12:00:34 +0000 | [diff] [blame^] | 1 | Example of BCC tool bitesize.py |
| 2 | |
| 3 | The aim of this tool is to show I/O distribution for requested block sizes, by process name. |
| 4 | |
| 5 | # ./bitesize.py |
| 6 | Tracing... Hit Ctrl-C to end. |
| 7 | ^C |
| 8 | |
| 9 | Process Name: = 'kworker/u128:1' |
| 10 | Kbytes : count distribution |
| 11 | 0 -> 1 : 1 |******************** | |
| 12 | 2 -> 3 : 0 | | |
| 13 | 4 -> 7 : 2 |****************************************| |
| 14 | |
| 15 | Process Name: = 'bitesize.py' |
| 16 | Kbytes : count distribution |
| 17 | 0 -> 1 : 0 | | |
| 18 | 2 -> 3 : 0 | | |
| 19 | 4 -> 7 : 0 | | |
| 20 | 8 -> 15 : 0 | | |
| 21 | 16 -> 31 : 0 | | |
| 22 | 32 -> 63 : 0 | | |
| 23 | 64 -> 127 : 0 | | |
| 24 | 128 -> 255 : 1 |****************************************| |
| 25 | |
| 26 | Process Name: = 'dd' |
| 27 | Kbytes : count distribution |
| 28 | 0 -> 1 : 3 | | |
| 29 | 2 -> 3 : 0 | | |
| 30 | 4 -> 7 : 6 | | |
| 31 | 8 -> 15 : 0 | | |
| 32 | 16 -> 31 : 1 | | |
| 33 | 32 -> 63 : 1 | | |
| 34 | 64 -> 127 : 0 | | |
| 35 | 128 -> 255 : 0 | | |
| 36 | 256 -> 511 : 1 | | |
| 37 | 512 -> 1023 : 0 | | |
| 38 | 1024 -> 2047 : 488 |****************************************| |
| 39 | |
| 40 | Process Name: = 'jbd2/dm-1-8' |
| 41 | Kbytes : count distribution |
| 42 | 0 -> 1 : 0 | | |
| 43 | 2 -> 3 : 0 | | |
| 44 | 4 -> 7 : 1 |****************************************| |
| 45 | |
| 46 | Process Name: = 'cat' |
| 47 | Kbytes : count distribution |
| 48 | 0 -> 1 : 1 | | |
| 49 | 2 -> 3 : 0 | | |
| 50 | 4 -> 7 : 0 | | |
| 51 | 8 -> 15 : 0 | | |
| 52 | 16 -> 31 : 0 | | |
| 53 | 32 -> 63 : 1 | | |
| 54 | 64 -> 127 : 0 | | |
| 55 | 128 -> 255 : 0 | | |
| 56 | 256 -> 511 : 1924 |****************************************| |
| 57 | |
| 58 | Process Name: = 'ntpd' |
| 59 | Kbytes : count distribution |
| 60 | 0 -> 1 : 0 | | |
| 61 | 2 -> 3 : 0 | | |
| 62 | 4 -> 7 : 104 |****************************************| |
| 63 | |
| 64 | Process Name: = 'vmtoolsd' |
| 65 | Kbytes : count distribution |
| 66 | 0 -> 1 : 0 | | |
| 67 | 2 -> 3 : 0 | | |
| 68 | 4 -> 7 : 1 |****************************************| |
| 69 | |
| 70 | Process Name: = 'bash' |
| 71 | Kbytes : count distribution |
| 72 | 0 -> 1 : 0 | | |
| 73 | 2 -> 3 : 0 | | |
| 74 | 4 -> 7 : 0 | | |
| 75 | 8 -> 15 : 0 | | |
| 76 | 16 -> 31 : 2 |****************************************| |
| 77 | |
| 78 | Process Name: = 'jbd2/sdb-8' |
| 79 | Kbytes : count distribution |
| 80 | 0 -> 1 : 0 | | |
| 81 | 2 -> 3 : 0 | | |
| 82 | 4 -> 7 : 1 |****************************************| |
| 83 | 8 -> 15 : 0 | | |
| 84 | 16 -> 31 : 0 | | |
| 85 | 32 -> 63 : 1 |****************************************| |
| 86 | |
| 87 | 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 |
| 88 | cat command generating 1924 IOPS between 256Kb and 512Kb. |
| 89 | |
| 90 | |
| 91 | See also systemtap version: |
| 92 | https://github.com/brendangregg/systemtap-lwtools/blob/master/disk/bitesize-nd.stp |