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Code Editor : bitesize-nd_example.txt
Examples of bitesize-nd.stp, the Linux SystemTap version. This shows size distributions for requested block I/O, by process name: # ./bitesize-nd.stp Tracing block I/O... Hit Ctrl-C to end. ^C I/O size (bytes): process name: flush-202:1 value |-------------------------------------------------- count 1024 | 0 2048 | 0 4096 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 33 8192 |@@@@@@@@@@@@@@@@ 16 16384 |@@@@@@@@@ 9 32768 |@@@@ 4 65536 |@@@ 3 131072 | 0 262144 | 0 process name: kjournald value |-------------------------------------------------- count 1024 | 0 2048 | 0 4096 |@ 4 8192 | 2 16384 | 2 32768 |@ 7 65536 |@ 5 131072 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 182 262144 | 0 524288 | 0 process name: randread.pl value |-------------------------------------------------- count 1024 | 0 2048 | 0 4096 | 4 8192 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 1859 16384 | 0 32768 | 5 65536 | 18 131072 | 0 262144 | 0 process name: tar value |-------------------------------------------------- count 1024 | 0 2048 | 0 4096 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 1645 8192 |@@@@@@@@@@@@@@@@@@@@@@@@@ 836 16384 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 1394 32768 |@@@@@@@@@@@@@@@@ 532 65536 |@@@@@ 180 131072 |@@@@@@ 219 262144 | 0 524288 | 0 tar(1) was archiving a directory of varying sized files, and writing an output file, which creates the distribution seen above. The randread.pl program was performing 8 Kbyte random reads. Note that there were a few larger I/O: some custom SystemTap can be used to explain this. Eg, show kernel stack traces for I/O larger than 32 Kbytes. I'd guess it was file system metadata. The aim of this tool is to help characterize the disk I/O workload.
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