Hello List,
I try to locate (potential) bottlenecks at a web server:
-----
% uname -a
FreeBSD bbserver.ipt.ru 8.0-STABLE FreeBSD 8.0-STABLE #3 r203959: Sun Feb 21
11:53:57 MSK 2010 r...@bbserver.ipt.ru:/z/obj/z/src/sys/BBSERVER amd64
% top -jd1 | head -20
last pid: 47907; load averages: 2.30, 1.88, 1.90 up 1+17:44:36 11:31:05
177 processes: 4 running, 172 sleeping, 1 zombie
Mem: 916M Active, 558M Inact, 2899M Wired, 2656K Cache, 31M Buf, 3502M Free
Swap: 4096M Total, 4096M Free
PID JID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU COMMAND
22148 4 88 25 44 0 735M 530M ucond 3 23:05 7.81% mysqld
47705 4 www 1 54 0 223M 58476K select 2 0:07 7.76% httpd
47845 4 www 1 51 0 225M 48800K accept 1 0:02 7.47% httpd
47857 4 www 1 53 0 221M 44308K select 3 0:01 7.47% httpd
47797 4 www 1 51 0 225M 56276K accept 1 0:03 6.59% httpd
47843 4 www 1 50 0 221M 43580K select 3 0:01 6.30% httpd
47873 4 www 1 51 0 233M 52424K CPU2 2 0:01 5.96% httpd
47633 4 www 1 49 0 221M 56476K select 3 0:08 5.76% httpd
47878 4 www 1 47 0 221M 43480K accept 2 0:01 4.30% httpd
47708 4 www 1 52 0 221M 56756K accept 2 0:06 4.20% httpd
47880 4 www 1 52 0 223M 39516K accept 2 0:01 4.05% httpd
47875 4 www 1 49 0 235M 45080K CPU3 3 0:00 4.05% httpd
-----
Let's use dtrace to understand what's going on within 10 seconds
interval and normalize to 1 second:
-----
% cat top-10-count-periodic.d
#pragma D option quiet
BEGIN
{
last = timestamp;
}
syscall:::entry
{
@func[execname] = count();
}
tick-10sec
{
trunc(@func, 10);
normalize(@func, (timestamp - last) / 1000000000);
printa(@func);
clear(@func);
last = timestamp;
}
-----
The result is here:
ftp://ftp.bsam.ru/pub/tmp/top-10-count-periodic.1.log.txt
OK, seems that we are mostly interested at mysqld and httpd processes
(well, not a surprise).
The following script is intended to test and quantize mysqld process:
-----
% cat quant.d
syscall:::entry
/ execname == "mysqld" /
{
self->ts = timestamp;
}
syscall:::return
/ self->ts && execname == "mysqld" /
{
@time[probefunc] = quantize(timestamp - self->ts);
self->ts = 0;
}
-----
The result: ftp://ftp.bsam.ru/pub/tmp/quant.mysqld.1.log.txt
The same D script but for httpd process:
ftp://ftp.bsam.ru/pub/tmp/quant.httpd.1.log.txt
And now can you advise me what to do next? What should I pay
attention to? Thanks!
--
WBR, Boris Samorodov (bsam)
Research Engineer, http://www.ipt.ru Telephone & Internet SP
FreeBSD Committer, http://www.FreeBSD.org The Power To Serve
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