[mpich-discuss] Spawn MPI-Process

[Rajeev Thakur]

Trying passing MPI_ARGV_NULL instead of hiargv. If that also doesn't work, then use a debugger to locate the seg fault.

Rajeev

On Aug 21, 2012, at 5:07 AM, Silvan Brändli wrote:

> Rajeev and Pavan, thank you for your suggestions. Unfortunately I still get the same error (segmentation fault). So I'm quite clueless where to look for the error now... If somebody could execute the example to see if the same error occurs this might be helpful.
> 
> Best regards
> Silvan
> 
> On 08/21/12 01:59, Rajeev Balaji wrote:
>> 
>> Or you can specify multiple process on the node using:
>> 
>> mpiexec -hosts localhost:100 -np 1 ./main
>> 
>> Then the universe size will be set to 100.
>> 
>>  -- Pavan
>> 
>> On 08/20/2012 12:49 PM, Rajeev Thakur wrote:
>>> Instead of universe_size-1, try passing some number like 3 or 4.
>>> 
>>> Rajeev
>>> 
>>> On Aug 20, 2012, at 4:39 AM, Silvan Brändli wrote:
>>> 
>>>> Dear all
>>>> 
>>>> I try to start an application using the MPI_Comm_spawn command.
>>>> However, when I execute my program I get a segmentation fault. I
>>>> guess, this might be because universe_size is one. As I couldn't find
>>>> helpful information on setting universe_size I hope some of you could
>>>> help me.
>>>> 
>>>> Find the source code below or in the attached files. I compile the
>>>> code using
>>>> mpicxx main.cpp -o main
>>>> mpicxx hi.cpp -o hi
>>>> 
>>>> and execute the case with
>>>> 
>>>> mpiexec -prepend-rank -np 1 ./main
>>>> 
>>>> The output is
>>>> 
>>>> $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
>>>> 
>>>> 
>>>> [0] world_size 1
>>>> [0] universe size 1
>>>> [0] try to spawn
>>>> 
>>>> =====================================================================================
>>>> 
>>>> =   BAD TERMINATION OF ONE OF YOUR APPLICATION PROCESSES
>>>> =   EXIT CODE: 11
>>>> =   CLEANING UP REMAINING PROCESSES
>>>> =   YOU CAN IGNORE THE BELOW CLEANUP MESSAGES
>>>> =====================================================================================
>>>> 
>>>> APPLICATION TERMINATED WITH THE EXIT STRING: Segmentation fault
>>>> (signal 11)
>>>> 
>>>> $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
>>>> 
>>>> 
>>>> Best regards
>>>> Silvan
>>>> 
>>>> $$$$==main.cpp==$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
>>>> 
>>>> 
>>>> #include <sstream>
>>>> #include <mpi.h>;
>>>> 
>>>> using std::string;
>>>> 
>>>> int main(int argc, char *argv[])
>>>> {
>>>>  int          myrank;
>>>>  if (MPI_Init(&argc,&argv)!=MPI_SUCCESS)
>>>>  {
>>>>    printf("MPI_Init failed");
>>>>  }
>>>>  MPI_Comm_rank(MPI_COMM_WORLD, &myrank);
>>>> 
>>>>  int world_size, universe_size, *universe_sizep, flag;
>>>>  MPI_Comm_size(MPI_COMM_WORLD, &world_size);
>>>>  printf("world_size %d\n",world_size);
>>>> 
>>>>  MPI_Attr_get(MPI_COMM_WORLD, MPI_UNIVERSE_SIZE,
>>>>  &universe_sizep, &flag);
>>>> 
>>>>  if (!flag)
>>>>  {
>>>>    printf("This MPI does not support UNIVERSE_SIZE. How many
>>>> processes total?");
>>>>    scanf("%d", &universe_size);
>>>>  } else universe_size = *universe_sizep;
>>>>  printf("universe size %d\n",universe_size);
>>>> 
>>>>  char* hiargv[1];
>>>>  char* m0=" ";
>>>>  hiargv[0]=m0;
>>>> 
>>>>  MPI_Comm childComm;
>>>>  int spawnerror;
>>>>  printf("try to spawn\n");
>>>>  MPI_Comm_spawn("./hi",hiargv, universe_size-1, MPI_INFO_NULL,
>>>> myrank, MPI_COMM_SELF, &childComm, &spawnerror);
>>>>  printf("after spawn\n");
>>>>  MPI_Finalize();
>>>>  return 0;
>>>> }
>>>> 
>>>> $$$$==hi.cpp==$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
>>>> 
>>>> 
>>>> #include <mpi.h>;
>>>> int main(int argc, char** argv) {
>>>>  MPI_Init(NULL, NULL);
>>>> 
>>>>  int world_size;
>>>>  MPI_Comm_size(MPI_COMM_WORLD, &world_size);
>>>> 
>>>>  int world_rank;
>>>>  MPI_Comm_rank(MPI_COMM_WORLD, &world_rank);
>>>> 
>>>>  printf("Hello world from, rank %d"
>>>>         " out of %d processors\n",
>>>>         world_rank, world_size);
>>>> 
>>>>  MPI_Finalize();
>>>>  return 0;
>>>> }
>>>> 
>>>> $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
>>>> 
>>>> --
>>>> Dipl.-Ing. Silvan Brändli
>>>> Numerische Strukturanalyse mit Anwendungen in der Schiffstechnik (M-10)
>>>> 
>>>> Technische Universität Hamburg-Harburg
>>>> Schwarzenbergstraße 95c
>>>> 21073 Hamburg
>>>> 
>>>> Tel.  : +49 (0)40 42878 - 6187
>>>> Fax.  : +49 (0)40 42878 - 6090
>>>> e-mail: silvan.braendli at tu-harburg.de
>>>> www   : http://www.tuhh.de/skf
>>>> 
>>>> <main.cpp><hi.cpp>_______________________________________________
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>>> 
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>> 
> 
> 
> -- 
> Dipl.-Ing. Silvan Brändli
> Numerische Strukturanalyse mit Anwendungen in der Schiffstechnik (M-10)
> 
> Technische Universität Hamburg-Harburg
> Schwarzenbergstraße 95c
> 21073 Hamburg
> 
> Tel.  : +49 (0)40 42878 - 6187
> Fax.  : +49 (0)40 42878 - 6090
> e-mail: silvan.braendli at tu-harburg.de
> www   : http://www.tuhh.de/skf
> 
> 
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