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Diffstat (limited to 'cddl/contrib/dtracetoolkit/Examples/dvmstat_example.txt')
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diff --git a/cddl/contrib/dtracetoolkit/Examples/dvmstat_example.txt b/cddl/contrib/dtracetoolkit/Examples/dvmstat_example.txt new file mode 100644 index 000000000000..1fb7fbb739d1 --- /dev/null +++ b/cddl/contrib/dtracetoolkit/Examples/dvmstat_example.txt @@ -0,0 +1,91 @@ +The following is a demonstration of the dvmstat program, + + +Here we run dvmstat to monitor all processes called "find". In another +window, a "find /" command is run, + + # dvmstat -n find + re maj mf fr epi epo api apo fpi fpo sy + 0 0 0 0 0 0 0 0 0 0 0 + 0 0 0 0 0 0 0 0 0 0 0 + 6336 0 372 0 0 0 0 0 0 0 22255 + 1624 0 0 0 0 0 0 0 0 0 5497 + 2292 0 0 0 0 0 0 0 0 0 7715 + 13064 0 0 0 0 0 0 0 0 0 43998 + 7972 168 0 0 0 0 0 0 168 0 38361 + 468 636 0 0 0 0 0 0 636 0 13774 + 376 588 0 0 0 0 0 0 588 0 10723 + 80 636 0 0 0 0 0 0 656 0 11078 + 48 772 0 0 0 0 0 0 812 0 9841 + 16 1028 0 0 0 0 0 0 1056 0 10752 + 0 1712 0 0 0 0 0 0 1740 0 12176 + 4 1224 0 0 0 0 0 0 1236 0 9024 + +The output above is spectacular! When the find command is first run, +it begins be reading data from the file cache, as indicated by the "re" +reclaims, and a lack of "fpi" filesystem page ins. + +Eventually the find command travels to places which are not cached, we can +see the "re" value drops, and both the "maj" major faults and "fpi" values +increase. This transition from cache hits to file system activity is +very clear from the above output. + + + +Here we run a dvmstat to examine the PID 3778, + + # dvmstat -p 3778 + re maj mf fr epi epo api apo fpi fpo sy + 0 0 0 0 0 0 0 0 0 0 0 + 0 0 0 0 0 0 0 0 0 0 0 + 24 28 0 0 0 0 0 0 28 0 109 + 4 148 16 0 0 0 0 0 148 0 1883 + 16 412 384 0 0 0 0 0 412 0 21019 + 0 0 0 0 0 0 0 0 0 0 3 + 0 0 0 0 0 0 0 0 0 0 221 + 0 0 0 0 0 0 0 0 0 0 0 + 0 0 0 0 0 0 0 0 0 0 84 + 0 0 0 0 0 0 0 0 0 0 0 + +Here we can see the statistics for that process only. + + + +The following runs the date command through dvmstat, + + # dvmstat date + Sun Jun 12 17:44:24 EST 2005 + re maj mf fr epi epo api apo fpi fpo sy + 16 0 208 0 0 0 0 0 0 0 38 + +The values above are for the date command only. + + + +Now we run dvmstat on a tar command. Here we tar around 50Mb of files, +so the command takes around 20 seconds to complete, + + # dvmstat tar cf backup.tar DTrace + re maj mf fr epi epo api apo fpi fpo sy + 20 256 304 0 8 0 0 0 352 0 621 + 4540 56 896 0 0 0 0 0 4636 0 1005 + 4432 12 644 0 0 0 0 0 4384 0 906 + 680 180 136 0 8 0 0 0 1056 0 502 + 2328 60 468 0 0 0 0 0 2296 0 592 + 1300 380 272 0 0 0 0 0 1704 0 1095 + 2816 72 560 0 0 0 0 0 2940 0 709 + 4084 40 416 0 0 0 0 0 4220 0 894 + 2764 4 276 0 0 0 0 0 2700 0 566 + 1824 96 328 0 0 0 0 0 2072 0 556 + 3408 80 392 0 20 0 0 0 3496 0 857 + 2804 92 552 0 4 0 0 0 2924 0 741 + 1344 16 272 0 0 0 0 0 1376 0 289 + 3284 52 520 0 12 0 0 0 3260 0 743 + 4832 200 812 0 0 0 0 0 5292 0 1276 + 11052 56 2200 0 0 0 0 0 8676 0 2326 + 5256 328 1020 0 8 0 0 0 4404 0 1725 + re maj mf fr epi epo api apo fpi fpo sy + 404 340 72 0 64 0 0 0 536 0 1135 + +Great! Activity from the tar command such as "fpi"s can be clearly seen. + |