[26511] in Athena Bugs
sshd uses up a large amount of CPU and RAM
daemon@ATHENA.MIT.EDU (Kevin Chen)
Mon Aug 22 14:23:44 2005
Date: Mon, 22 Aug 2005 14:23:03 -0400 (EDT)
From: Kevin Chen <kchen@mit.edu>
To: bugs@mit.edu
Message-ID: <Pine.LNX.4.62L.0508221416410.15586@scyther.mit.edu>
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On assassin.mit.edu, a Linux-Athena 9.3.18 machine:
>From top:
14:17:21 up 20 days, 15:32, 1 user, load average: 2.21, 2.30, 1.54
94 processes: 90 sleeping, 3 running, 1 zombie, 0 stopped
CPU states: cpu user nice system irq softirq iowait idle
total 14.8% 0.0% 85.1% 0.0% 0.0% 0.0% 0.0%
Mem: 503352k av, 497944k used, 5408k free, 0k shrd, 2084k
buff
366936k actv, 68264k in_d, 6784k in_c
Swap: 4249152k av, 2731668k used, 1517484k free 13880k
cached
PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME CPU COMMAND
15095 hongyihu 25 0 2303M 200M 44 R 52.2 40.6 6:24 0 sshd
15103 hongyihu 25 0 2123M 202M 44 R 47.2 41.2 5:06 0 sshd
Also note the load average and the high swap use. We were previously
encountering problems with the machine freezing randomly (and needed to be
force-rebooted) when we only had 512 MB of swap -- it looks like this sshd
problem is causing it.
After I killed these sshd processes, memory usage dropped to 66 MB in use
and swap dropped to 317 MB in use. Hongyi tells me he wasn't doing
anything other than attempting to SSH in to the machine, and that it
didn't successfull log him in.
--
Kevin Chen
http://www.sneswhiz.com/
