[mpich-discuss] Client - server programs on Windows

[Thierry Roudier]

Thanks Darius for your answer. Unfortunately, by running mpiexec I 
didn't find a way to set a unique KVS and domain name. Then the programs 
run in 2 different scopes. And it seems that is the reason why they 
cannot communicate together.
Regards,

Thierry

On 23/08/2011 4:50 PM, Darius Buntinas wrote:
> 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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