verifying SMP

[Thomas Guignon]

Le Vendredi 26 Juillet 2002 10:21, vous avez écrit :
> Gabriel J. Weinstock:
> > Hi,
> >   Does anyone know a good way to test if a certain process is running on
> > different CPUs on an SMP cluster node? For example, if one were to mpirun
> > -np 4 prog where the machines file looked like
> > node1:2
> > node2:2
> >   how could you verify that one process is being started on each CPU?
> > Using top is one option, but then you're still inferring where the
> > process is running. We're seeing funny numbers in our code and would like
> > to verify where Linux is scheduling processes.

Hello,
Take a look al /proc/#pid/cpu.
There is 2 lines that indicates how many jiffies the process #pid spent
in user and système mode.
ex:
>cat /proc/24996/cpu
cpu  25197 346
cpu0 10836 144
cpu1 14361 202

and some time later
>cat /proc/24996/cpu
cpu  29928 419
cpu0 13319 183
cpu1 16609 236

A+
-- 
Guignon Thomas, thomas.guignon at artabel.net
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