[FLASH-USERS] Fatal error in MPI_Comm_create when I run Flash on Mac os x

[Reem Alraddadi]

Hi Klaus,

I am running laser slab example after I modified for three materials, and I
am using the following command :

/setup -auto Slab3 -2d +pm4dev  -nxb=16  -nyb=16  species=cham,targ,foil
+mtmmmt +mgd  mgd_meshgroups=6 -parfile=example.par +3t  -maxblocks=3000

I increased the maxblocks to 3000 as I used 6 level of AMR.In addition,
Yes, I am using hypre-2.9.0b with FLASH4.0.1. I will change it to
hypre-2.80b. However, the library that I used together with hypre to run
FLASH4.0.1 are:
1-MPICH-3.0.4
2.hdf5-1.8.9


However, may I ask different question here. Is increasing maxblocks to 3000
is fine to run with 4 GD memory of Mac? Do I need more memory in order to
increase the resolution here?

Thanks again,
Reem


> Message: 1
> Date: Mon, 8 Jul 2013 12:57:21 -0500 (CDT)
> From: Klaus Weide <klaus at flash.uchicago.edu>
> Subject: Re: [FLASH-USERS] Fatal error in MPI_Comm_create when I run
>         Flash on Mac os x
> To: flash-users at flash.uchicago.edu
> Message-ID: <Pine.LNX.4.64.1307081244130.2832 at flash.uchicago.edu>
> Content-Type: TEXT/PLAIN; charset=US-ASCII
>
> On Mon, 8 Jul 2013, Reem Alraddadi wrote:
>
> > I am running FLASH4 on Mac os x version 10.7.5 and I am using mpich-3.0.4
> > and I got the following error:
> >
> > Fatal error in MPI_Comm_create: Other MPI error, error stack:
> > MPI_Comm_create(600)..........
> > .......: MPI_Comm_create(comm=0x84000002, group=0xc8001349,
> > new_comm=0x7fff606a8614) failed
>   .....
> > People from mpich suggested that I should  free unsed communicators.
>
> FLASH in general deallocates the communicators that it allocates.
> I am not aware of any released version of FLASH 4 with a communicator leak
> in the FLASH code.
>
> Are you perhaps trying to use FLASH with the hypre library?
> (You did not supply any information on what kind of simulation
> you have configured, which code units are included etc.)
> I know of a communicator leak problem in the FLASH4 + hypre-2.9.0b
> combination. If this is what you are trying to use, I suggest
> downgrading hypre to 2.8.0b or 2.7.0b as a solution.
>
> > So I
> > added in  Flash_mpi.h the following line:
> >    integer, parameter :: FLASH_COMM = MPI_COMM_FREE
>
> This change does not make much sense to me.
>
> Klaus
>
>
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