Thread Subject: spmd Vs pmode

I'm running some code with the parallel toolbox

The problem I have now is that running exactly the same code within a spmd statement takes longer time than running it under pmode (even profiling), the results are the same but it takes 90% more time to run the same code.

Is there any difference between these two methods that may be causing this problem?

Could it be the fact that under spmd the variables are of composite type?

thanks in advance.

"Pablo Diaz" <pabloadr87@hotmail.com> writes:
> I'm running some code with the parallel toolbox
>
> The problem I have now is that running exactly the same code within a spmd
> statement takes longer time than running it under pmode (even profiling), the
> results are the same but it takes 90% more time to run the same code.
>
> Is there any difference between these two methods that may be causing this problem?
>
> Could it be the fact that under spmd the variables are of composite type?

Hi Pablo,

Running inside PMODE should be virtually identical to running inside
SPMD, except of course you need to use 'matlabpool open' with SPMD. If
you open and close many SPMD blocks, this might cause additional
overhead. Do you have any example code that you could post?

Cheers,

Edric.