[Nek5000-users] problem with running nek5000 on supercomputers

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

It seems that for each time I had to clean compiled files before changing
the processor count and run it again! It works now!

Thanks,
Ami

On Mon, Nov 10, 2014 at 4:29 PM, Amirreza Hashemi <amirezahashemi at gmail.com>
wrote:

> 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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>>
>>
>
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