[mpich-discuss] How to terminate MPI_Comm_accept

[Balaji, Pavan]

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> 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
> 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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