[mpich-discuss] Client - server programs on Windows

Darius Buntinas buntinas at mcs.anl.gov
Tue Aug 23 12:35:27 CDT 2011


Have you tried starting each one with a separate mpiexec?  Unless there are some constraints on doing this on Windows, it should work if you give the port name correctly to the client.

-d


On Aug 23, 2011, at 11:06 AM, Thierry Roudier wrote:

> Actually it's one of my constraints: I cannot run the programs in the same command line.
> 
> Thierry
> 
> On 23/08/2011 5:52 PM, Darius Buntinas wrote:
>> If you want to run two different binaries in the same application you can separate them by a colon (:).  E.g.,
>> 
>>     mpiexec -n 4 prog1 : -n 2 prog2
>> 
>> This will start 4 processes with the prog1 executable and 2 processes with the prog2 executable.
>> 
>> Is this what you're trying to do?
>> 
>> -d
>> 
>> 
>> On Aug 23, 2011, at 10:31 AM, Thierry Roudier wrote:
>> 
>>> 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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