[mpich-discuss] Client - server programs on Windows

[Darius Buntinas]

A pmi server is needed to exchange connection information (ip address and port) between the processes.  Mpiexec provides this.  Sorry, there's really no way I can see to do this statically.

-d

On Aug 23, 2011, at 2:40 AM, Thierry Roudier wrote:

> Hi,
> 
> Did someone already try this kind of config?
> Thank you very much!
> 
> Best regards,
> 
> Thierry
> 
> On 17/08/2011 9:14 PM, Thierry Roudier wrote:
>> Hi,
>> 
>> I try to connect 2 programs together using MPICH2 v1.4 between 2 Windows 7 64-bit computers.
>> I tested various configurations without success. Below is the last config I tried:
>> 
>> - Windows 1: Server
>> From a command prompt I set the following variables, and ran the server:
>> set PMI_ROOT_HOST=windows_1
>> set PMI_KVS=mpich2
>> set PMI_ROOT_LOCAL=1
>> set PMI_ROOT_PORT=9222
>> set PMI_SIZE=2
>> set PMI_RANK=0
>> Here is the C code for the server:
>> #include <stdio.h>
>> #include <mpi.h>
>> int main(int nArgc, char ** sArgv)
>> {
>>    int nMyRank = 0;
>>    MPI_Comm mInterComm;
>>    int nRet;
>> 
>>    char sPortName[MPI_MAX_PORT_NAME];
>> 
>>    nRet = MPI_Init(&nArgc, &sArgv);
>>    printf("Init - nRet: %d\n", nRet);
>>    fflush(stdout);
>>    nRet = MPI_Comm_rank(MPI_COMM_WORLD, &nMyRank);
>>    printf("Comm_rank - nRet: %d - MyRank: %d\n", nRet, nMyRank);
>>    fflush(stdout);
>> 
>>    nRet = MPI_Open_port(MPI_INFO_NULL, sPortName);
>>    printf("Open_port - nRet: %d - Port name: -%s-\n", nRet, sPortName);
>>    fflush(stdout);
>> 
>>    nRet = MPI_Comm_accept(sPortName, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &mInterComm);
>>    printf("Comm_accept - nRet: %d\n", nRet);
>>    fflush(stdout);
>> 
>>    MPI_Comm_disconnect(&mInterComm);
>>    MPI_Finalize();
>> 
>>    return 0;
>> }
>> 
>> 
>> - Windows 2: Client (on a command prompt on the second computer)
>> set PMI_ROOT_HOST=windows_1
>> set PMI_KVS=mpich2
>> set PMI_ROOT_LOCAL=0
>> set PMI_ROOT_PORT=9222
>> set PMI_SIZE=2
>> set PMI_RANK=1
>> Here is the C code for the client:
>> #include <stdio.h>
>> #include <mpi.h>
>> int main(int nArgc, char ** sArgv)
>> {
>>    int nMyRank;
>>    MPI_Comm mInterComm;
>>    int nRet;
>> 
>>    char sPortName[MPI_MAX_PORT_NAME];
>>    char sPortNumber[MPI_MAX_PORT_NAME];
>> 
>>    nRet = MPI_Init(&nArgc, &sArgv);
>>    printf("Init - nRet: %d\n", nRet);
>>    fflush(stdout);
>>    nRet = MPI_Comm_rank(MPI_COMM_WORLD, &nMyRank);
>>    printf("Comm_rank - nRet: %d - MyRank: %d\n", nRet, nMyRank);
>>    fflush(stdout);
>> 
>>    printf("Enter the port number: ");
>>    fflush(stdout);
>>    gets(sPortNumber);
>>    sprintf(sPortName, "tag=0 description=windows_1 port=%s ifname=192.168.1.101 ", sPortNumber);
>> 
>>    printf("Connecting to: -%s-\n", sPortName);
>>    fflush(stdout);
>>    nRet = MPI_Comm_connect(sPortName, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &mInterComm);
>>    printf("Comm_connect - nRet: %d\n", nRet);
>>    fflush(stdout);
>> 
>>    MPI_Comm_disconnect(&mInterComm);
>>    MPI_Finalize();
>> 
>>    return 0;
>> }
>> 
>> I don't use mpiexec. I directly start the programs on each computer from the command prompts. And the smpd services are stopped.
>> Note: I also checked without fixing the variables above, and with a mpiexec command (smpd(s) running). It doesn't work. Same problem as described below.
>> 
>> The issue I encountered is the following: The server initializes, wait in the MPI_Init function until the client starts. Once the client initialized, both programs get their respective rank 0 (server) and 1 (client). The server opens the port and displays the info. I enter the port number in the client program. And both waits. The connection is never established. The server waits in MPI_Comm_accept and the client waits in MPI_Comm_connect.
>> 
>> Note: I didn't set a domain name on my machines. I only set a unique workgroup name.
>> 
>> Any help would be really appreciated.
>> 
>> Regards,
>> 
>> Thierry
>> 
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