From: Kelly F. Hickel <kfh@mq...> - 2005-05-25 14:37:56
It seems likely to me that since both processes are accessing the same
disk/files the scheduler has to idle one while the other is running
(probably context switching at IO waits or something). The fact that
they're both on the same cpu is either accidental or the scheduler
taking advantage of the fact that both processes are using the same
binaries, maybe it doesn't have to reload the l2 cache....
Kelly F. Hickel
Senior Software Architect
> -----Original Message-----
> From: backuppc-users-admin@...
> admin@...] On Behalf Of Jacob S
> Sent: Wednesday, May 25, 2005 9:34 AM
> To: Peter Padberg
> Cc: backuppc-users@...
> Subject: Re: [BackupPC-users] Multi-processor machines
> On Wed, 25 May 2005 18:26:05 +0200
> Peter Padberg <Peter.Padberg@...> wrote:
> > Hi,
> > > Backuppc is working normally, except I noticed it only uses one of
> > > the two cpus.
> > the kernel must handle this, isnt it?
> Sorry, I thought that would be obvious when I mentioned top showing
> idle time on the cpu. I do have an smp kernel installed. "cat
> /proc/cpuinfo" definitely shows both cpus and recognizes them
> There are other things on this server that use both cpus and the
> will start other processes on the idle cpu, but all of the Backuppc
> stuff seems to be 'stuck' on the one cpu.
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