[mpich-discuss] MPI_Send Error

[Mandar Gurav]

Try to execute the program using
"mpiexec  -n 2 ./test.x" only

or can you tell what is there in your "hosts" (Described in command "mpiexec
-f *hosts* -n 2 ./test.x*"*) file

----Mandar Gurav

On Wed, Feb 2, 2011 at 4:38 PM, Deniz DAL <dendal25 at yahoo.com> wrote:

> Hello everyone,
> I created a small linux cluster with 4 compute nodes yesterday. I installed
> Fedora 14 OS to all machine and mpich2 v1.3.2 on the server node. But i have
> a serious problem. I can not even make a simple send and receive program
> work. below is the steps that i follow. You will see the error at the end. I
> can not run point to point and collective communication routines of mpi. I
> am suspecting that the problem might have sthg to do with the hydra. Any
> help is appreciated.
> Deniz.
>
>
> *[ddal at admin mpi_uygulamalar]$ cat hosts
> admin
> cn01
> cn02
> cn03
> [ddal at admin mpi_uygulamalar]$ cat 01_Send_Receive_One_Message.cpp
> #include "mpi.h"
> #include <iostream>
> using namespace std;*
> *#define TAG 25*
> *int main(int argc, char* argv[])
> {
>  int myRank,
>          size;*
> * char processorName[50];
>  int nameLength;*
> * int a;//size of the send buffer
>  int b;*
> * MPI_Status status;*
> * /* Initialize MPI */
>  MPI_Init(&argc, &argv);*
> * /* Determine the size of the group */
>  MPI_Comm_size(MPI_COMM_WORLD,&size);*
> * /* Determine the rank of the calling process */
>  MPI_Comm_rank(MPI_COMM_WORLD,&myRank);*
> * MPI_Get_processor_name(processorName, &nameLength);*
> * if(size != 2 )
>  {
>   cout<<"Number of CPUs must be 2 !\n";
>   MPI_Abort(MPI_COMM_WORLD, 99);
>  }*
> * if(myRank == 0)/* Master Sends a Message */
>  {
>   a=25;*
> *  MPI_Send(&a, 1, MPI_INT, 1, TAG, MPI_COMM_WORLD);
>   printf("%s Sent Variable a Successfully\n",processorName);
>  }
>  else /* Process 1 Receives the Message */
>  {
>   MPI_Recv(&b, 1, MPI_INT, 0, TAG, MPI_COMM_WORLD, &status );
>   printf("%s Received Variable a Successfully over b\n",processorName);
>   printf("b=%d\n",b);
>  }*
> * /* Terminate the MPI */
>  MPI_Finalize();*
> * return 0;
> }[ddal at admin mpi_uygulamalar]$ mpicxx 01_Send_Receive_One_Message.cpp -o
> test.x
> [ddal at admin mpi_uygulamalar]$ mpiexec -f hosts -n 2 ./test.x
> Fatal error in MPI_Send: Other MPI error, error stack:
> MPI_Send(173)..............: MPI_Send(buf=0xbf928900, count=1, MPI_INT,
> dest=1, tag=25, MPI_COMM_WORLD) failed
> MPID_nem_tcp_connpoll(1811): Communication error with rank 1:
> [mpiexec at admin] ONE OF THE PROCESSES TERMINATED BADLY: CLEANING UP
> [proxy:0:1 at cn01] HYD_pmcd_pmip_control_cmd_cb
> (./pm/pmiserv/pmip_cb.c:868): assert (!closed) failed
> [proxy:0:1 at cn01] HYDT_dmxu_poll_wait_for_event
> (./tools/demux/demux_poll.c:77): callback returned error status
> [proxy:0:1 at cn01] main (./pm/pmiserv/pmip.c:208): demux engine error
> waiting for event
> APPLICATION TERMINATED WITH THE EXIT STRING: Hangup (signal 1)
> [ddal at admin mpi_uygulamalar]$ *
>
>
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>
>


-- 
|||| Mandar Gurav ||||
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