I have a problem with on of my FreeBSD boxes. All of a sudden, it
started acting very badly: any process takes ages to start completely,
eating all CPU in the process:
PID USERNAME PRI NICE SIZE RES STATE TIME WCPU CPU COMMAND
852 root 57 0 1528K 996K RUN 0:19 91.95% 59.81% top
root@ishtar ~ 1017:0 # time ps auxww
ps auxww 0.00s user 0.01s system 0% cpu 2.197 total
root@ishtar ~ 1018:0 #
compare a slower box:
root@lilith ~ 1005:0 # time ps auxww
ps auxww 0.00s user 0.02s system 64% cpu 0.036 total
root@lilith ~ 1006:0 #
This strangeness lasted for about 20 minutes, persisted across a reboot
(I pulled out the wrong cable...), and then just disappeared; the box
works as it should.
I know this is hard to asnwer, but what could have caused the effect,
and what should I be looking for if it happens again? There's nothing
especially interesting in /var/log/messages.
BTW, top showed swap wasn't used at all.
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