[mpich-discuss] [EXTERNAL] Re: Modifying ssh calls for MPICH2

[Reuti]

Am 18.01.2012 um 00:32 schrieb Kekatpure, Rohan Deodatta (-EXP):

> Reuti,
> 
> I dont remember installing OpenMPI. I downloaded "mpich2-1.4.1p1.tar.gz" from 
> 
> http://www.mcs.anl.gov/research/projects/mpich2/downloads/tarballs/1.4.1p1/
> 
> and followed the install instructions in the README file. Is there a way to confirm that I dont have OpenMPI installed (and to remove it if it is present for some reason?) 

which mpicc
mpicc -v


> Thanks,
> Rohan
> 
> 
> 
> On Jan 17, 2012, at 3:22 PM, Reuti wrote:
> 
>> Am 17.01.2012 um 23:19 schrieb Kekatpure, Rohan Deodatta (-EXP):
>> 
>>> I think I have more basic problems than what you are referring to:
>>> 
>>> I copy-pasted Reuti's code into a file named mpitest.c and tried to compile with 
>>> 
>>> gcc -Wall mpitest.c
>>> 
>>> It failed to compile and issued following error(s):
>>> =================================
>>> Undefined symbols:
>>> "_ompi_mpi_comm_world", referenced from:
>> 
>> ompi - do you have Open MPI installed too?
>> 
>> -- Reuti
>> 
>> 
>>>     _main in cc8tNiKW.o
>>> "_MPI_Comm_rank", referenced from:
>>>     _main in cc8tNiKW.o
>>> "_MPI_Finalize", referenced from:
>>>     _main in cc8tNiKW.o
>>> "_MPI_Init", referenced from:
>>>     _main in cc8tNiKW.o
>>> ld: symbol(s) not found
>>> collect2: ld returned 1 exit status
>>> ==================================
>>> 
>>> 
>>> Rohan
>>> 
>>> On Jan 17, 2012, at 3:09 PM, Jed Brown wrote:
>>> 
>>>> On Tue, Jan 17, 2012 at 16:02, Reuti <reuti at staff.uni-marburg.de> wrote:
>>>> main(int argc, char **argv)
>>>> {
>>>> int node;
>>>> 
>>>> int i,j;
>>>> float f;
>>>> 
>>>> MPI_Init(NULL,NULL);
>>>> MPI_Comm_rank(MPI_COMM_WORLD, &node);
>>>> 
>>>> printf("Hello World from Node %d.\n", node);
>>>>     for(j=0; j <= 100000; j++)
>>>>         for(i=0;i <= 100000; i++)
>>>>             f=i*2.718281828*i+i+i*3.141592654;
>>>> 
>>>> Well this is an odd spin loop because the compiler will happily remove it for you (note that MPICH2's mpicc wrapper very frequently has optimization flags in it). I would suggest sleep(3) instead, or, if you must, force the loop to actually be executed (e.g. seed the loop with the rank and use the result).
>>>> _______________________________________________
>>>> mpich-discuss mailing list     mpich-discuss at mcs.anl.gov
>>>> To manage subscription options or unsubscribe:
>>>> https://lists.mcs.anl.gov/mailman/listinfo/mpich-discuss
>>> 
>>> _______________________________________________
>>> mpich-discuss mailing list     mpich-discuss at mcs.anl.gov
>>> To manage subscription options or unsubscribe:
>>> https://lists.mcs.anl.gov/mailman/listinfo/mpich-discuss
>> 
>> _______________________________________________
>> mpich-discuss mailing list     mpich-discuss at mcs.anl.gov
>> To manage subscription options or unsubscribe:
>> https://lists.mcs.anl.gov/mailman/listinfo/mpich-discuss
>> 
> 
> 
> _______________________________________________
> mpich-discuss mailing list     mpich-discuss at mcs.anl.gov
> To manage subscription options or unsubscribe:
> https://lists.mcs.anl.gov/mailman/listinfo/mpich-discuss