[Nek5000-users] problems running in parallel

[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
>
> 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
>
> Could you help me, please?
>
> Regards,
>
> SL
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>
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