Beniamino Sciacca wrote:
> Hi community!
> I've a great problem:
> two months ago I installed LAM on my centrino duo, debian -kernel 2.6.
> Later I compiled gromacs enabling mpi, and everything was working well
> until four days ago.
> Now the simulation time is increased like if there is only one processor
> (it takes twice time than before).
> I don't understand why.
> I disinstalled and then reinstalled LAM and gromacs (LAM 7.1.2 (I
> compiled it on my own) + gromacs 3.3.1).
> Nothing has changed.
> I disinstalled linux and then reinstalled (debian kernel 2.6), and again
> LAM and gromacs: I've the same problem, like if one of the two cores
> doesn't work.
> I tried also to install gromacs NON mpi-enabled, and I've the same
> simulation time (respect to the enabled-mpi gromacs).
> In all these cases LAM seems to work (when I type lamboot LAM starts
> without problem).
>
> What's happened?
> How can I understand if it's a software problem or an hardware one?
> thank you very much for the reply!
The first question I always ask is - what changed? You say it was
working properly up to some point, something must have happened at or
before that point.
It's hard to tell based on the information you've given, but the first
thing I would do is make sure linux has both CPU's enabled, and that any
power management stuff isn't affecting your performance.
Can you test any other applications, to see if this problem is specific
to LAM/gromacs?
You might consider other support channels as well - I can't recommend a
good place for you off the top of my head, but LAM is not likely the
problem here.
Andrew
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