Re: multiprocessor
After learning from you how to inquiry the cpu, and reading better the mpqc
manual, the command
mpqc -messagegrp "<ShmMessageGrp>:(n = 4)" filename.inp | tee filename.out
puts all four processors at work and the acceleration with respect to using
only one cpu is really impressive.
My message is perhaps not inappropriate for this list, because my curiosity is
to ask how the two dual opteron cpu work with calculation software that was
not devised for parallel processes. In fact, unlike with mpqc above,
acceleration of my machine with respect to a simple Athlon for force field
calculations with classical programs is modest indeed. What do the two dual
opteron in this case?
Cheers
francesco pietra
On Tuesday 20 June 2006 16:15, Gnu-Raiz wrote:
> On Tuesday 20 June 2006 01:35, Francesco Pietra wrote:
> > Forgot to say:
> >
> > $ uname -a
> > Linux deb64 2.6.15-1-amd64-k8-smp #2 date
> > ________________
> >
> > mpqc 2.3.0-1, running on amd64 etch debian, sees only one
> > processor, while there are two.
> >
> > I posed the question also to the mpqc list but, in the meantime,
> > I wonder wether there is anything general to do with debian.
> >
> > Mother bowrd Tyan K8WE S 2895, two 265 dual opteron, all eight
> > slots of ram filled (1 GB each)
> >
> > At computer on:
> > CPU0=Dual Core amd64 opteron 265
> > CPU1=Dual Core amd64 opteron 265
> >
> > All ram detected (also, subsequently, with top command)
> >
> >
> > As far as I understand, on the general command
> > $ mpqc filename.inp | tee filename.ou
> > all available processor should be detected.
> >
> > What can be done from the debian general point of view of
> > checking processors?
> >
> > Thanks for helping.
> >
> > Cheers
> >
> > francesco pietra
>
> Top will tell you how many CPU's you have hit 1 when in top, should
> give you an account of your CPU's.
>
> Don't forget dmesg, that will tell you as well, like another
> gentleman said it starts counting from 0, so it is normal to see
> only 3 as the final CPU.
>
> Also most of the stuff you need can be found in the /proc directory,
> in fact that is what top uses. So if you need a quick fix just cat
> in your /proc directory to see the information.
>
> Gnu_Raiz
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