Hi all,
I have had a few years sorting out hardware performance on
some of our loaded linux compute servers. This one has me perplexed..
It is not too much of a worry but I would like to know why
this is happening .. and if I should be worried :-)
Machine (Fedora 16) is not running at peak performance but has done
so previous to last week or so.. So there is possibly something about the mix
of the current
jobs that is causing it.
top - 10:13:09 up 164 days, 1:40, 13 users, load average: 12.31, 14.60, 15.11
Tasks: 305 total, 3 running, 299 sleeping, 3 stopped, 0 zombie
Cpu(s): 14.4%us, 22.2%sy, 0.0%ni, 59.9%id, 0.0%wa, 2.0%hi, 1.4%si, 0.0%st
Mem: 65979204k total, 37972660k used, 28006544k free, 617516k buffers
Swap: 16777212k total, 101216k used, 16675996k free, 32201980k cached
So heaps of memory, swap. CPU's are sitting idle a lot of the time
(They shouldn't be on this compute server)
nfsiostat and iostat show next to nothing happening
(its a compute server not an io server)
Vmstat has the weird bit that I haven't seen before. system interrupts and context switches are
through the roof for anything I have seen.
$ vmstat 1
procs -----------memory-------------- ---swap-- -----io---- --system--
-----cpu-----
r b swpd free buff cache si so bi bo in cs us sy id
wa st
2 0 101216 28003040 617520 32203196 0 0 0 68 68295 71578 16 25 59
0 0
12 0 101216 28004640 617520 32203196 0 0 0 0 71740 72877 14 24 62
0 0
6 0 101216 28001972 617520 32203196 0 0 0 0 70366 72381 14 25 61
0 0
4 0 101216 27997920 617520 32203196 0 0 0 0 67163 68348 13 25 62
0 0
Googling found something about leap seconds and restarting ntp.. which I have
done.
Anyone have ideas or suggestions on what to look at ?
I would prefer not to do the "three finger salute" on this machine
as some jobs have been running for weeks.
Cheers
Pete
--
Peter Glassenbury Computer Science & Software Engineering
[email protected] University of Canterbury
+64 3 3667001 ext 7762
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