[Nek5000-users] problem with running nek5000 on supercomputers

[nek5000-users at lists.mcs.anl.gov]

Dr. Fishcer,

Thanks for your answer, for sure, I change the lelt and lelg and keep them
as lowest even number that I can pick when I increase the number of CPUs. I
picked also lp=32768, but I still get this "allocation failed" error. Is
there any thing else that effect on the allocation which I have to change
it?!

Thanks,
Ami

On Mon, Nov 10, 2014 at 8:55 AM, <nek5000-users at lists.mcs.anl.gov> wrote:

>
>  Hi Ami,
>
>  When you increase the processor count, you can recompile with a smaller
> lelt.
>
>  Suppose you have lelt=1000 and you go from P=64 to P=128.  Then set
> lelt=500 and
> recompile.
>
>  Make certain lelg >= 500*P and lp >= 128.
>
>  I would suggest lelg="big enough" (and an even number) and lp=32768.
>
>  Paul
>
>  ------------------------------
> *From:* nek5000-users-bounces at lists.mcs.anl.gov [
> nek5000-users-bounces at lists.mcs.anl.gov] on behalf of
> nek5000-users at lists.mcs.anl.gov [nek5000-users at lists.mcs.anl.gov]
> *Sent:* Monday, November 10, 2014 5:05 AM
> *To:* nek5000-users at lists.mcs.anl.gov
> *Subject:* [Nek5000-users] problem with running nek5000 on supercomputers
>
>    Hi Neks,
>
>  I am trying to run my simulation with nek5000 on supercomputers, the size
> of the problem is something like:
>
>  text	   data	    bss	    dec	    hex	filename
> 2233955	 187412	2554984280	2557405647	986ee9cf	nek5000
>
>  I don't have any problem when I use 32~64 CPUs to run parallel on
> supercomputers, but once I go for more than 64 CPUs, I always get
> "allocation failed" error. I have tried to run on different supercomputer
> like as Gordon SDSC, OSC, TACC, but I got the same type of error each time.
> I have checked the active memories, it seems for each of them memories have
> large unused portion. Does any one have any idea why when I increase the
> number of CPUs I get this allocation error?!
>
>  Thank you,
> Ami
>
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