Re: [mpich-discuss] How to terminate MPI_Comm_accept

8 Oct 2014


      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 <[email protected]> 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: [email protected]
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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Pavan Balaji  ✉️
http://www.mcs.anl.gov/~balaji

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Re: [mpich-discuss] How to terminate MPI_Comm_accept

Balaji, Pavan