Date: Fri, 03 May 2002 10:35:49 -0400 (EDT) From: John Baldwin <jhb@FreeBSD.org> To: Jason Borkowsky <jcborkow@tcpns.com> Cc: hackers@FreeBSD.org Subject: RE: CPU context switching/load numbers Message-ID: <XFMail.20020503103549.jhb@FreeBSD.org> In-Reply-To: <Pine.BSF.4.44.0205022105500.72825-100000@bemused.tcpns.com>
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On 03-May-2002 Jason Borkowsky wrote: > >> > Greetings! I have a FreeBSD-4.5 box that is a specialized server box. It >> > doesn't run any user processes and only runs a bunch of small, server >> > efficient processes. >> > >> > I have an inconsistency that I am trying to explain. When I do a "w" >> > command >> > on the box, I see this: >> > >> > 7:31PM up 74 days, 39 mins, 1 user, load averages: 1.12, 0.94, 0.93 >> > >> > This says I have a load of 1.12 over the past minute, or, for every >> > available CPU interval, I have 1.12 processes requesting the CPU. >> >> This last bit is where you go wrong. The 1.12 is just for the minute prior >> to >> when you ran the command, it has no relation to any previous minutes. Just >> cause it is 1.12 right now doesn't mean the average load for every minute is >> 1.12. > > But these numbers are over months...I have used an expect script to > periodically poll the load and vmstat, and save them off to a file. My > average load over a three month period is about 0.98, but the average CPU > idle time over the same 3 month period is about 85% idle. Yes, and when your script was running, it was runnable, right? So it artifically inflated the last minute's load. -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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