[mvapich-discuss] MPI_Comm_accept failed when some client connected to the server

[马凯]

    I have met another trouble when using port communication.
    The MPI_Open_port seem to work OK, and it gave me this:
server available at tag#0$description#"#RANK:00000000(00000001:0000034a:00000001:00000000)#"$


    And then, I launched the client to connect to the port according to the port_name. But at that moment, the server would abort, and told me this:
 [gpu-cluster-1:mpi_rank_0][error_sighandler] Caught error: Segmentation fault (signal 11)
[gpu-cluster-1:mpispawn_0][readline] Unexpected End-Of-File on file descriptor 5. MPI process died?
[gpu-cluster-1:mpispawn_0][mtpmi_processops] Error while reading PMI socket. MPI process died?
[gpu-cluster-1:mpispawn_0][child_handler] MPI process (rank: 0, pid: 12810) terminated with signal 11 -> abort job
[gpu-cluster-1:mpirun_rsh][process_mpispawn_connection] mpispawn_0 from node 192.168.2.1 aborted: Error while reading a PMI socket (4)
    And the client would do nothing just being stuck.
    I will be appreciated for any help!




    The fallowing is my server code:
#include<mpi.h>
#include<stdio.h>
#include<stdlib.h>


void main(int argv, char *argc[]) {
    int myid;
    int size;
    MPI_Comm client;
    MPI_Status status;
    char port_name[MPI_MAX_PORT_NAME];
    char buf[1024];


    MPI_Init(&argv, &argc);
    MPI_Comm_size(MPI_COMM_WORLD, &size);
    if(size > 1) {
        printf("Server too big\n");
        exit(EXIT_FAILURE);
    }


    MPI_Open_port(MPI_INFO_NULL, port_name);
    printf("server available at %s\n", port_name);


//  MPI_Publish_name("server", MPI_INFO_NULL, port_name);


    MPI_Comm_accept(port_name, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &client);
    printf("Accpet successfully\n");


    MPI_Recv(buf, 1024, MPI_CHAR, MPI_ANY_SOURCE, MPI_ANY_TAG, client, &status);


    MPI_Comm_disconnect(&client);
//  MPI_Unpublish_name("server", MPI_INFO_NULL, port_name);
    MPI_Comm_free(&client);
    MPI_Finalize();
}


    The fallowing is my client code:
#include<mpi.h>
#include<stdio.h>
#include<stdlib.h>


void main(int argc, char *argv[]) {
    int myid;
    int size;
    MPI_Comm server;
    MPI_Status status;
    char port_name[MPI_MAX_PORT_NAME];
    char buf[1024];


    if(argc < 2) {
        printf("too few arguments\n");
        exit(EXIT_FAILURE);
    }


    MPI_Init(&argc, &argv);
    MPI_Comm_size(MPI_COMM_WORLD, &size);
    if(size > 1) {
        printf("Client too big\n");
        exit(EXIT_FAILURE);
    }


    //MPI_Lookup_name("server", MPI_INFO_NULL, port_name);


    MPI_Comm_connect(argv[1], MPI_INFO_NULL, 0, MPI_COMM_WORLD, &server);
    printf("Connect successfully\n");


    MPI_Send(buf, 0, MPI_CHAR, 0, 100, server);


    MPI_Comm_disconnect(&server);
    MPI_Comm_free(&server);
    MPI_Finalize();
}


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