> Date: Mon, 4 Dec 2006 09:52:17 +0100> From: [EMAIL PROTECTED]> To:
misc@openbsd.org> Subject: CPU running hot due to (buggy) software> > Hi,> >
I've got an issue with a machine that runs hot once [a Mailman Python>
process] appears to go into a tight loop and consumes 99% of the CPU for a>
longer amount of time.> > Output from sensorsd shows the temperature over a 15
minute period:> > Nov 11 21:44:02 2006 | temp,25.00 | temp,67.00 | temp,27.00
| > Nov 11 21:45:01 2006 | temp,25.00 | temp,68.00 | temp,27.00 | > Nov 11
21:46:01 2006 | temp,25.00 | temp,74.00 | temp,27.00 | > Nov 11 21:47:01 2006
| temp,25.00 | temp,77.00 | temp,27.00 | > Nov 11 21:48:01 2006 | temp,25.00 |
temp,78.50 | temp,27.00 | > Nov 11 21:49:01 2006 | temp,25.00 | temp,80.50 |
temp,27.00 | > Nov 11 21:50:01 2006 | temp,25.00 | temp,81.00 | temp,27.00 | >
Nov 11 21:51:01 2006 | temp,25.00 | temp,87.00 | temp,27.00 | > Nov 11
21:52:01 2006 | temp,25.00 | temp,87.50 | temp,27.00 | > Nov 11 21:53:01 2006
| temp,25.00 | temp,88.50 | temp,27.00 | > Nov 11 21:54:01 2006 | temp,25.00 |
temp,89.00 | temp,27.00 | > Nov 11 21:55:01 2006 | temp,25.00 | temp,90.50 |
temp,27.00 | > Nov 11 21:57:01 2006 | temp,25.00 | temp,91.00 | temp,27.00 | >
Nov 11 21:58:01 2006 | temp,25.00 | temp,92.00 | temp,27.00 | > Nov 11
21:59:01 2006 | temp,25.00 | temp,92.00 | temp,27.00 | > Nov 11 22:00:01 2006
| temp,25.00 | temp,93.50 | temp,27.00 | > > At this point the CPU halts. I've
tried using CPU throttling in the BIOS (if> CPU hot, 75% idle) to no avail. >
> I will be removing Mailman from the process list in the short term, but in>
order to safeguard against this sort of thing in other code (a friend of> mine
noticed that his socket polling code did almost the same thing to his> Mac
before he rewrote it, for example), is there anything at the OS level I> can
do? Or would I need to write a "cpu hogwatcher" which just takes> "necessary
action"?> > This particular machine is running 3.6/x86.> > Kind regards,> >
Tor>
While I perfectly understand that you said you had a problem with Mailman
that uses too much CPU time, you need to understand that normally the
hardware is built to allow you to use the CPU at 100% for all the time.
According to that and the temperatures you reported, it means you have
a problem that should be fixed on the hardware level. Your machine simply
overheats. You did not tell us a lot about the hardware of this machine.
Is it a tower server or is it a rackmount unit? Is it in a server room where
the air that enters the case might already be too hot? With more details
about your hardware setup, I am sure I can provide you with some tips
about how to enhance the cooling. If I were you I would take the machine
down. 90C+ temps at 100% cpu load is not normal.
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