Date: Sat, 27 Oct 2007 14:04:21 +0200 From: Gunther Mayer <gunther.mayer@googlemail.com> To: freebsd-questions@freebsd.org Subject: CPU usage 100% but no process hogging CPU Message-ID: <47232945.10506@gmail.com>
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Hi there, I'm having some capacity issues on the FreeBSD 6.2/Core 2 Duo/2GB RAM server that I manage. For quite a few days now it constantly shows load averages of around 1 and a CPU usage of around 100%. Yet summing up the CPU usage of the individual processes running I hardly ever get to more than 5%, regardless of how long I watch top. A snapshot of my top output looks like this: last pid: 96102; load averages: 1.28, 1.15, 1.06 up 22+08:33:16 13:55:03 122 processes: 2 running, 119 sleeping, 1 zombie CPU states: 67.3% user, 0.0% nice, 32.7% system, 0.0% interrupt, 0.0% idle Mem: 474M Active, 974M Inact, 186M Wired, 68M Cache, 213M Buf, 93M Free Swap: 4064M Total, 4064M Free PID USERNAME THR PRI NICE SIZE RES STATE TIME WCPU COMMAND 635 root 1 122 0 27304K 2644K select 656:38 1.27% syslog-ng 844 www 20 20 0 411M 300M kserel 360:13 0.00% java 837 user1 3 20 0 29048K 5672K kserel 34:30 0.00% radiusd 788 pgsql 1 96 0 13516K 3824K select 10:03 0.00% postgres 785 pgsql 1 115 0 120M 7436K select 9:02 0.00% postgres 787 pgsql 1 8 0 120M 41112K nanslp 5:15 0.00% postgres syslog-ng is quite busy as I use it to capture logs of more than 50 remote sites. I have lots of slow queries in my postgres logs that I think are related to this bottleneck, though unoptimised queries and an ever growing amount of data are more likely to take the blame for that. High disk I/O in this regard could explain the high system utilisation, however. I found out that I've been bitten by the freebsd-update bug (http://security.freebsd.org/advisories/FreeBSD-EN-07:05.freebsd-update.asc) which replaced my SMP kernel with a GENERIC one and I'm taking corrective action early tomorrow morning, but surely even with just a single CPU the load average should never be as high? Where are those phantom CPU hogging processes? Gunther
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