Mailinglist Archive: opensuse (1523 mails)

["Jeffrey L. Taylor" <jeff@xxxxxxxxxxxxxxxx>]

Quoting Hans Witvliet <hwit@xxxxxxxxxxx>:
> Perhaps a silly question...
>
> I noticed on one of my machines, one of the cores was permanently 100%
> busy, while others were stile idle. (two dual-cores)
>
> This i noticed both for openvpn and rsync. For both my cpu is apperently
> the bottleneck, not my network.
>
> Aren't the processes supposed to be spread even on the different core's?

These programs, as are most programs (still), are single process/thread.  They
do not take advantage of multiple cores.  Parallel programming is even more
difficult than single process/thread programming to get right.

If you have a tool that shows which CPU is busy, you may see them occasionally
switch CPUs.

It is a matter of tradeoffs, correctness should always be valued over speed
and a programmer's time is always a limited resource.

Just my $0.02USD,
  Jeffrey
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