[mpich-discuss] Mapping process to specific node

[Rajeev Thakur]

Not sure what the problem is. You may want to check with the SLURM folks. Does it work without the -f host.txt?

Rajeev

On Feb 3, 2012, at 2:53 PM, Fernando Luz wrote:

> Hi again,
> 
> Another information, I'm using slurm, and if I execute without reservation the nodes, I'm successful .
> 
> With slurm, first I made salloc reservation.
> 
> $ salloc -N 3 --exclusive
> 
> And I receive a 3 nodes with 8 cores.
> 
> $ echo $SLURM_NODELIST 
> machine01
> machine02
> machine03
> 
> and if I run mpiexec
> 
> $ mpiexec -n 10 -f host.txt ./hostname_test
> srun: error: Only allocated 3 nodes asked for 6
> 
> Regards
> 
> Fernando Luz
> 
> On Sex, 2012-02-03 at 18:31 -0200, Fernando Luz wrote:
>> Hello,
>> 
>> I create the follow program:
>> 
>> =========================================================
>> #include "mpi.h"
>> # include <cstdlib>
>> # include <iostream>
>> # include <iomanip>
>> # include <ctime>
>> 
>> 
>> int main ( int argc, char *argv[] )
>> {
>>   int rank;
>>   int size;
>>   char hostname[255];
>>   int size_hostname;
>>   double wtime;
>> 
>>   MPI::Init ( argc, argv );
>>   size = MPI::COMM_WORLD.Get_size();
>>   rank = MPI::COMM_WORLD.Get_rank();
>>   MPI::Get_processor_name(hostname, size_hostname);
>>   
>>   if ( rank == 0 ){
>>     std::cout << "  print size = " << size << std::endl;
>>   }
>> 
>>   std::cout << "I am rank=" << rank << " and my hostname=" << hostname << std::endl;
>>   
>>   MPI::Finalize();
>> 
>>   return 0;
>> }
>> =========================================================
>> 
>> In my execution test, I was planned run this program using this command-line
>> 
>> $ mpiexec -n 10 -f host.txt ./hostname_test
>> 
>> and the host.txt
>> ========================================================
>> machine01  # rank 0 run in machine01
>> machine02  # rank 1 run in machine02
>> machine03  # rank 2 run in machine03
>> machine03  # rank 3 run in machine03
>> machine02  # rank 4 run in machine02
>> machine03  # rank 5 run in machine03
>> machine01  # rank 6 run in machine01
>> machine01  # rank 7 run in machine01
>> machine03  # rank 8 run in machine03
>> machine01  # rank 9 run in machine01
>> ========================================================
>> 
>> But I don't have success. 
>> 
>> It's possible to select a process to run in a specific node?
>> 
>> Regards
>> 
>> Fernando Luz
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