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

--

_________________________

_______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss