[mpich-discuss] MPI_Comm_connect issue

[Roy, Hirak]

Hi mpich team,

I am using MPICH 3.0.4 sock with dynamic connection (accept/connect).
I am facing issues with the following scenario, when there is a race condition in MPI_Comm_connect.

Here is the case


1>    Server opens a port, writes the port info in a file, calls MPI_Comm_accept

2>    Client1 & Client2 reads the port information from file and each client calls MPI_Comm_connect

3>    Server accepts one client, disconnects, closes the port, exit

4>    One of the client successfully connects, disconnects, exit

5>    The other client hangs in MPI_Comm_connect


If you do the following steps, you can reproduce the issue


1>    Please set compiler and installation path of MPICH in makefile

2>    make : compiles

3>    make run_bad


I have noticed that in case client calls MPI_Comm_connect after the port is closed, the connect calls successfully terminates with error (make run_good).

Please let me know whether it is a bug or not.
Please also let me know if the connect call can be configured with a timeout or not.

Thanks,
Hirak
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mpich.org/pipermail/discuss/attachments/20160512/b003f46c/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: raceCondition.tar.gz
Type: application/x-gzip
Size: 1326 bytes
Desc: raceCondition.tar.gz
URL: <http://lists.mpich.org/pipermail/discuss/attachments/20160512/b003f46c/attachment.gz>
-------------- next part --------------
_______________________________________________
discuss mailing list     discuss at mpich.org
To manage subscription options or unsubscribe:
https://lists.mpich.org/mailman/listinfo/discuss