I'm the webmaster for www.marssociety.org, which is a FreeBSD
6.2-RELEASE box running on a dual-core AMD Opteron setup with 4GB of
RAM. The box is reasonably busy, as it's the sole piece of hardware
running web, database, and mail operations for the Mars Society, an
international nonprofit group dedicated to space exploration. We
regularly send out newsletters to ~10,000 members, and our web site is
averaging ~50,000-100,000 hits/day.
The main portion of the web site is run via the Zope/Plone CMS system
(Plone 2.5, for anyone who may care). Recently, it's been slowing down
dramatically, and our Plone guy (not me -- I inherited the system and
can't stand it) can't figure out why. I've been diving into OS-related
issues, and in so doing, I ran across what appears to be a very high
number of context switches going on. Here's some sample output from
"vmstat 2":
procs memory page disk faults cpu
r b w avm fre flt re pi po fr sr ad4 in sy cs us sy id
2 5 0 1311980 410176 702 1 0 0 587 9 0 544 3194 954 49 2 49
2 5 0 1311980 410172 2 0 0 0 3 0 6 316 3599 3749 51 2 47
2 5 0 1313804 409348 659 0 0 0 480 0 12 381 9903 8141 52 4 44
2 5 0 1311188 409908 3 0 0 0 81 0 0 430 12153 9019 53 4 43
2 5 0 1311188 409904 140 0 0 0 123 0 14 462 11912 8323 50 4 47
2 5 0 1311700 410224 76 0 0 0 113 0 1 612 6791 5749 53 2 46
1 5 0 1311532 409936 721 0 0 0 597 0 0 207 851 531 54 1 45
2 5 0 1308908 410508 2 0 0 0 80 0 6 382 10527 8253 50 4 46
1 5 0 1307084 411344 10 0 0 0 115 0 0 398 13087 8903 48 4 48
2 5 0 1307112 411288 6 0 0 0 7 0 3 440 11023 8619 54 2 44
2 5 0 1313604 404780 883 0 0 0 80 0 10 480 13711 10526 52 4 44
1 5 0 1315320 404468 37 0 0 0 0 0 0 629 1651 2509 50 1 48
2 5 0 1360792 367620 4926 0 0 0 315 0 14 346 7631 3078 60 2 38
2 5 1 1371172 366348 268 0 0 0 103 0 0 527 9903 8926 51 3 46
2 5 0 1361772 372800 1002 0 0 0 1807 0 0 571 11340 8572 54 6 40
3 5 0 1356132 373348 135 0 0 0 198 0 0 884 11792 9699 50 4 46
1 5 0 1344928 380692 78 0 0 0 986 0 0 552 15652 13671 50 5 45
Unfortunately, this is the only busy FreeBSD box I have access to, so I
have no good way of telling if the values I'm seeing are abnormal or
not. Can anyone tell me if these numbers look high, or if anything from
the vmstat output above looks abnormal and should be followed up on?
Thanks,
Alex Kirk
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