[Nek5000-users] problems running in parallel

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

Thanks. Now it works!


El 10-06-2014 19:38, nek5000-users at lists.mcs.anl.gov escribió:
> Hi,
> 
> Note also that sometime, for unknown reason, mpiexec does not work
> correctly on certain platforms and you should use instead
> mpiexec.mpich2
> That has solved the problem for me few months ago.
> 
> ++
> JC
> 
> 2014-06-10 19:32 GMT+02:00 <nek5000-users at lists.mcs.anl.gov>:
> 
>> You seem to be running on a single proc. You have to start the
>> program using one one of the scripts
>> 
>> nekmpi
>> 
>> or
>> 
>> nekbmpi
>> 
>> E.g.
>> 
>> nekmpi jobname 4
>> 
>> to run with 4 procs.
>> 
>> praveen
>> 
>> On Tue, Jun 10, 2014 at 7:23 PM, <nek5000-users at lists.mcs.anl.gov>
>> wrote:
>> 
>>> Dear users,
>>> 
>>> I am trying to simulate the flow past a cylinder. If I run my
>>> simulation with lelt=2000, lelg=2000 in 1 processor, everything
>>> works fine. However, if I increase the resolution to lelt=4200 I
>>> get a compilation error.
>>> 
>>> Following this post:
>>> 
>>> 
>> 
> http://lists.mcs.anl.gov/pipermail/nek5000-users/2013-April/002101.html
>>> [1]
>>> 
>>> I have seen that if I use more processors, the code compiles
>>> fine.
>>> 
>>> However, now I am not able to run the code using 4 processors. I
>>> get the following error:
>>> 
>>>  Number of processors:           1
>>>  REAL    wdsize      :           8
>>>  INTEGER wdsize      :           4
>>> 
>>>   Beginning session:
>>>   /SL/nek5_svn/test/cyl/cyl.rea
>>> 
>>>  timer accuracy:   1.1920929E-07 sec
>>> 
>>>  read .rea file
>>> 
>>>   Beginning session:
>>>   /SL/nek5_svn/test/cyl/cyl.rea
>>> 
>>>  timer accuracy:   9.5367432E-08 sec
>>> 
>>>  read .rea file
>>>  nelgt/nelgv/lelt:        4425        4425      
>>>  2000
>>>  lx1  /lx2  /lx3 :           5           5      
>>>     5
>>> 
>>>   ABORT: Problem size too large!
>>> 
>>>   This solver has been compiled for:
>>>      number of elements/proc  (lelt):        2000
>>>      total number of elements (lelg):        5000
>>> 
>>>   Recompile with the following SIZE  parameters:
>>>      lelt >=         4425  for np =            1
>>>      lelg >=         4425
>>> 
>>> I have a 3d mesh with 4425 elemnts. In the SIZE file I have set:
>>> 
>>>       parameter (ldim=3)
>>>       parameter (lx1=5,ly1=lx1,lz1=lx1,lelt=2000,lelv=lelt)
>>>       parameter (lxd=(3*lx1)/2,lyd=lxd,lzd=lxd)
>>>       parameter (lelx=1,lely=lelx,lelz=lely)
>>> 
>>>       parameter (lx2=lx1-0)   ! Pressure array dimensions
>>>       parameter (ly2=ly1-0)
>>>       parameter (lz2=lz1-0)
>>> 
>>>       parameter (lx3=lx2)
>>>       parameter (ly3=ly2)
>>>       parameter (lz3=lz2)
>>> 
>>>       parameter (lp = 4)  ! Max # processors
>>>       parameter (lelg = 5000) ! Max # elements, total
>>> 
>>>       parameter (lzl=3 + 2*(ldim-3))
>>> 
>>> I have tried to follow this post to solve the problem, but I
>>> couldn't:
>>> 
>>> 
>> 
> https://lists.mcs.anl.gov/mailman/htdig/nek5000-users/2013-December/002411.html
>>> [2]
>>> 
>>> Could you help me, please?
>>> 
>>> Regards,
>>> 
>>> SL
>>> _______________________________________________
>>> Nek5000-users mailing list
>>> Nek5000-users at lists.mcs.anl.gov
>>> https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users [3]
>> 
>> _______________________________________________
>> Nek5000-users mailing list
>> Nek5000-users at lists.mcs.anl.gov
>> https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users [3]
> 
> --
> 
> Jean-Christophe Loiseau
> Homepage [4]
> 
> 
> Links:
> ------
> [1] 
> http://lists.mcs.anl.gov/pipermail/nek5000-users/2013-April/002101.html
> [2]
> https://lists.mcs.anl.gov/mailman/htdig/nek5000-users/2013-December/002411.html
> [3] https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users
> [4] https://sites.google.com/site/loiseaujc/
> 
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