Hi.
Ivan Voras wrote:
last pid: 5266; load averages: 24.67, 22.65, 17.44 up 0+03:56:38
121 processes: 41 running, 62 sleeping, 18 waiting
CPU states: 9.5% user, 0.0% nice, 82.0% system, 0.5% interrupt, 8.0%
idle
This is really unusual - the number of processes is not that high, but
if I'm reading the line from systat correctly, you have unusually many
context switches:
r p d s w Csw Trp Sys Int Sof Flt cow 16839 total
27 1 39 137k 3390 33k 2490 313 2519 2519 zfod
sio0 irq4
nginx or similar asynchronous web servers should reduce inter-process
contention context switches dramatically, but you say that it didn't
work as such so the problem might be somewhere else.
Try sending a 10-second or so output from vmstat to confirm this problem.
Yes, there's really many context switches:
%vmstat 1
procs memory page disk faults cpu
r b w avm fre flt re pi po fr sr mf0 in sy cs us
sy id
23 1 0 615284 3581456 15980 0 0 0 15964 0 0 1414 58211 115230
25 60 15
24 0 0 631668 3564976 9940 0 0 0 5793 0 0 664 30036 158059
11 79 10
20 0 0 655220 3545516 22146 0 0 0 16731 0 0 1992 77638 116627
31 65 4
23 0 0 622452 3579700 18248 0 0 0 27451 0 0 1839 80646 115798
38 59 3
15 9 0 614260 3587484 4795 0 0 0 6765 0 0 352 23938 159993
6 83 11
21 0 0 625524 3567948 10154 0 0 0 5308 0 0 653 32718 159119
11 81 8
13 3 0 627572 3571924 15266 0 0 0 16278 0 0 1031 50321 142111
20 69 11
21 0 0 605044 3591860 9008 0 0 0 14021 0 0 873 42083 160441
13 79 8
19 1 0 611188 3593404 7498 0 0 0 7920 0 0 489 30012 158176
10 77 13
24 0 0 610164 3592360 5855 0 0 0 5602 0 0 666 26627 162937
8 81 11
20 3 0 622452 3587456 6372 0 0 0 5144 0 0 362 23705 161257
10 81 10
^C
%
If you can, attach a ktrace(1) to one of the httpd processes that
consumes CPU, and send the processed kdump output.
Here is it: http://83.167.98.162/gprof/kdump.txt.gz
Also, did you try configuring and running pecl-APC for PHP?'s
I'm using eAccelerator. Again, the same soft works good on less-CPU
system and on Linux.
With best regards,
Alexey Popov
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