The async thread is used to handle asynchronous error/notification events, like port up/down, hca errors etc. So most of the time the thread sleeps, and in healthy network you not supposed to see any events.
Regards, Pasha On Dec 23, 2010, at 12:49 AM, Eugene Loh wrote: > I'm starting to look at the openib BTL for the first time and am > puzzled. In btl_openib_async.c, it looks like an asynchronous thread is > started. During MPI_Init(), the main thread sends the async thread a > file descriptor for each IB interface to be polled. In MPI_Finalize(), > the main thread asks the async thread to shut down. Between MPI_Init() > and MPI_Finalize(), I would think that the async thread would poll on > the IB fd's and handle events that come up. If I stick print statements > into the async thread, however, I don't see any events come up on the IB > fd's. So, the async thread is useless. Yes? It starts up and shuts > down, but never sees any events on the IB devices? > _______________________________________________ > devel mailing list > de...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/devel
