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

[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?) 

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
>