I also have this problem where xconsole eats whatever CPU time is idle.
It doesnt slow down the box too much, but it does slow it down somewhat,
especially when its under a heavier load. I just kill xconsole as soon
as i login, not the ideal situation, but it works.
Richard Fillion
rick@rhix.ods.org
On Sun, 2002-08-04 at 15:47, Paul Slootman wrote:
> On Sat 03 Aug 2002, Peter Watkinson wrote:
> > Paul Slootman wrote:
> > >On Wed 31 Jul 2002, Peter Watkinson wrote:
> > >
> > >
> > >>oops sorry. System monitor shows xconsole having cpu usage at 99.9%.
> > >>However
> > >
> > >It might be interesting to find out why xconsole is eating so much
> > >time... Perhaps do a strace on it? It may be having trouble reading its
> > >input, so that it's basically doing a busy-wait loop, which is bad.
> >
> > tried strace xconsole - what should I be looking for. Did on 2.4.18 and
> > 2.2 kernels and they seem pretty similar. Gone back to 2.2 kernel
> > everything seems to be working fine.
>
> Well, if it's showing CPU usage of 99.9%, then strace should show
> xconsole to be pretty busy. If I attach strace to the running xconsole
> (use -p pid) I see something like this:
>
> select(5, [3 4], [], [], NULL) = 1 (in [4])
> read(4, "Aug 4 22:42:05 wurtel ippl: smt"..., 1024) = 70
> select(5, [4], [], [], {0, 0}) = 0 (Timeout)
> ioctl(3, 0x541b, [0]) = 0
> write(3, "C\0\5\0\21\0`\0\17\0`\0\21\0d\0\5\0\r\0=\0\4\0\21\0`\0"..., 212) = 212
> ioctl(3, 0x541b, [0]) = 0
> gettimeofday({1028493725, 706945}, NULL) = 0
> select(5, [3 4], [], [], NULL <unfinished ...>
>
> I.e. it only does something when something actually is logged. In the
> meantime it's blocked on the select() call waiting for data, so the CPU
> usage is absolutely zero at that time.
>
> So, does it do the same when you fire up 2.4... Unfortunately my alpha
> is headless at the moment, so I can't try this at home :-) If it's
> eating time and not showing anything in strace, then it's busy in an
> internal loop. But then it won't show select() being waited on either...
>
> Perhaps you didn't notice any difference between 2.2 and 2.4 because you
> started up a _separate_ xconsole instead of attaching to the running
> xconsole?
>
>
> Paul Slootman
>
>
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