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Diffstat (limited to 'cddl/contrib/dtracetoolkit/Examples/iopattern_example.txt')
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diff --git a/cddl/contrib/dtracetoolkit/Examples/iopattern_example.txt b/cddl/contrib/dtracetoolkit/Examples/iopattern_example.txt new file mode 100644 index 0000000..818a4a2 --- /dev/null +++ b/cddl/contrib/dtracetoolkit/Examples/iopattern_example.txt @@ -0,0 +1,57 @@ +The following is a demonstration of the iopattern program, + + +Here we run iopattern for a few seconds then hit Ctrl-C. There is a "dd" +command running on this system to intentionally create heavy sequential +disk activity, + + # iopattern + %RAN %SEQ COUNT MIN MAX AVG KR KW + 1 99 465 4096 57344 52992 23916 148 + 0 100 556 57344 57344 57344 31136 0 + 0 100 634 57344 57344 57344 35504 0 + 6 94 554 512 57344 54034 29184 49 + 0 100 489 57344 57344 57344 27384 0 + 21 79 568 4096 57344 46188 25576 44 + 4 96 431 4096 57344 56118 23620 0 + ^C + +In the above output we can see that the disk activity is mostly sequential. +The disks are also pulling around 30 Mb during each sample, with a large +average event size. + + + +The following demonstrates iopattern while running a "find" command to +cause random disk activity, + + # iopattern + %RAN %SEQ COUNT MIN MAX AVG KR KW + 86 14 400 1024 8192 1543 603 0 + 81 19 455 1024 8192 1606 714 0 + 89 11 469 512 8192 1854 550 299 + 83 17 463 1024 8192 1782 806 0 + 87 13 394 1024 8192 1551 597 0 + 85 15 348 512 57344 2835 808 155 + 91 9 513 512 47616 2812 570 839 + 76 24 317 512 35840 3755 562 600 + ^C + +In the above output, we can see from the percentages that the disk events +were mostly random. We can also see that the average event size is small - +which makes sense if we are reading through many directory files. + + + +iopattern has options. Here we print timestamps "-v" and measure every 10 +seconds, + + # iopattern -v 10 + TIME %RAN %SEQ COUNT MIN MAX AVG KR KW + 2005 Jul 25 20:40:55 97 3 33 512 8192 1163 8 29 + 2005 Jul 25 20:41:05 0 0 0 0 0 0 0 0 + 2005 Jul 25 20:41:15 84 16 6 512 11776 5973 22 13 + 2005 Jul 25 20:41:25 100 0 26 512 8192 1496 8 30 + 2005 Jul 25 20:41:35 0 0 0 0 0 0 0 0 + ^C + |
