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Date: Fri, 3 Aug 2007 00:34:51 +1000 (EST)
From: Ian Smith <smithi@nimnet.asn.au>
To: Zbigniew Szalbot <zbigniew@szalbot.homedns.org>
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Cc: freebsd-questions@freebsd.org
Subject: Re: logging system load
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On Thu, 2 Aug 2007 12:52:20 +0200 Zbigniew Szalbot <zbigniew@szalbot.homedns.org> wrote:

 > On Thu, 2 Aug 2007 13:44:33 +0300, Nikos Vassiliadis <nvass@teledomenet.gr>
 > wrote:
 > > On Wednesday 25 July 2007 20:50, Momchil Ivanov wrote:
 > >> На Wednesday 25 July 2007 19:38:41 Zbigniew Szalbot написа:
 > >> > Dear all,
 > >> >
 > >> > Is there a tool similar to top which would measure system load and
 > >> > write it to a file that could later be analyzed? The time when my
 > >> > system is most loaded happens between 3 and 5 a.m. so a trace of the
 > >> > system load would be a wonderful thing to have. I need it to tailor
 > >> > some of the jobs accordingly. Any advice?
 > >> >
 > >> > Thanks in advance!
 > >>
 > >> You can make a cronjob doing "uptime >> /path/to/logfile" every minute
 > > 
 > > Or perhaps "sysctl -n vm.loadavg" instead of uptime,
 > > which is the same information, but requires less
 > > scrubbing.
 > 
 > Thanks but that wouldn't record the time, would it? With uptime it is nice
 > to have the current time also recorded and I can compare logs to load by
 > time.

paqi% /bin/echo `/bin/date` `/sbin/sysctl -n vm.loadavg`
Fri Aug 3 00:33:13 EST 2007 { 0.04 0.11 0.09 }

Cheers, Ian