Durga, TCP doesn't need a specialized progress function because we are tied directly with libevent. In your case you should provide a BTL progress function, function that will be called at the end of libevent base loop regularly.
George. On Thu, May 5, 2016 at 11:30 PM, dpchoudh . <dpcho...@gmail.com> wrote: > Hi all > > Apologies for a 101 level question again, but here it is: > > A new BTL layer I am implementing hangs in MPI_Send(). Please keep in mind > that at this stage, I am simply desperate to make MPI data move through > this fabric in any way possible, so I have thrown all good programming > practice out of the window and in the process might have added bugs. > > The test code basically has a single call to MPI_Send() with 8 bytes of > data, the smallest amount the HCA can DMA. I have a very simple > mca_btl_component_progress() method that returns 0 if called before > mca_btl_endpoint_send() and returns 1 if called after. I use a static > variable to keep track whether endpoint_send() has been called. > > With this, the MPI process hangs with the following stack: > > (gdb) bt > #0 0x00007f7518c60b7d in poll () from /lib64/libc.so.6 > #1 0x00007f75183e79f6 in poll_dispatch (base=0x19cf480, > tv=0x7f75177efe80) at poll.c:165 > #2 0x00007f75183df690 in opal_libevent2022_event_base_loop > (base=0x19cf480, flags=1) at event.c:1630 > #3 0x00007f75183613d4 in progress_engine (obj=0x19cedd8) at > runtime/opal_progress_threads.c:105 > #4 0x00007f7518f3ddf5 in start_thread () from /lib64/libpthread.so.0 > #5 0x00007f7518c6b1ad in clone () from /lib64/libc.so.6 > > I am using code from master branch for this work. > > Obviously I am not doing the progress handling right, and I don't even > understand how it should work, as the TCP btl does not even provide a > component progress function. > > Any relevant pointer on how this should be done is highly appreciated. > > Thanks > Durga > > > The surgeon general advises you to eat right, exercise regularly and quit > ageing. > > _______________________________________________ > devel mailing list > de...@open-mpi.org > Subscription: https://www.open-mpi.org/mailman/listinfo.cgi/devel > Link to this post: > http://www.open-mpi.org/community/lists/devel/2016/05/18919.php >
