[mpich-discuss] How to terminate MPI_Comm_accept

[Roy, Hirak]

Hi Pavan,



I even tried duping the communicator (MPI_COMM_SELF --> DUP1, DUP2) before I do any kind of MPI calls.

Still it does not work.



Thanks,

Hirak







You cannot do a Comm_dup when another thread is doing a collective call on the same communicator (e.g., Comm_accept).



On Oct 8, 2014, at 2:36 PM, Roy, Hirak <Hirak_Roy at mentor.com<https://lists.mpich.org/mailman/listinfo/discuss>> wrote:



> Hi Pavan,

>

> I tried doing dup on both sides as well as on the client side only.

> Both cases, it did not work.

>

> Thanks,

> Hirak

>

> Here is the server-side

>

>   MPI_Comm dupCom ;

>   MPI_Comm_dup (MPI_COMM_SELF, &dupCom);

>   do {

>     MPI_Comm newComm ;

>     MPI_Comm_accept (m_serverPort.c_str(), MPI_INFO_NULL, 0, dupCom, &newComm);

>     int buf = 0 ;

>     MPI_Status status ;

>     Log ("Waiting on receive");

>     MPI_Recv(&buf, 1, MPI_INT, MPI_ANY_SOURCE, MPI_ANY_TAG, newComm, &status);

>     Log ("Receive complete");

>     if (status.MPI_TAG == MPI_MSG_TAG_NEW_CONN) {

>       m_clientComs[m_clientCount] = newComm ;

>       m_clientCount++;

>     } else if (status.MPI_TAG == MPI_MSG_TAG_SHUTDOWN) {

>       Log ("Shutdown");

>       MPI_Comm_disconnect (&newComm);

>       Log ("Disconnect");

>       break;

>     } else {

>       Log ("Unmatched Receive");

>     }

>   } while(1) ;

>

>

>

>

> Are you doing MPI_Comm_dup while the other thread is doing MPI_Comm_accept?

>

>   - Pavan

>

>

> From: Roy, Hirak

> Sent: Thursday, October 09, 2014 12:55 AM

> To: discuss at mpich.org<https://lists.mpich.org/mailman/listinfo/discuss>

> Subject: Re: Re: Re: How to terminate MPI_Comm_accept

>

> Hi Pavan,

>

> Does not work.

> Crash in nemesis.

> Sock hangs in MPI_Recv/MPI_Send

>

>

> Thanks,

> Hirak

>

>   MPI_Comm newComm ;

>   MPI_Comm dupCom ;

>   MPI_Comm_dup (MPI_COMM_SELF, &dupCom);

>   MPI_Comm_connect (m_serverPort.c_str(), MPI_INFO_NULL, 0, dupCom, &newComm);

>   Log ("Connect to Self");

>   int val = 0 ;

>   MPI_Request req ;

>   MPI_Send(&val, 1, MPI_INT, 0, MPI_MSG_TAG_SHUTDOWN, newComm);

>   Log ("Successful");

>   MPI_Comm_disconnect(&newComm);

>

>

>

>

> On Oct 8, 2014, at 11:41 AM, Roy, Hirak <Hirak_Roy at mentor.com> wrote:

> > Is there any way to come out of the blocking accept?

>

> You can dup MPI_COMM_SELF and do the connect using that other communicator.

>

>   - Pavan

>

> --

>

> _________________________

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