On Mon, Jan 7, 2013 at 11:09 PM, Geoffrey Irving <[email protected]> wrote:

On Mon, Jan 7, 2013 at 11:39 AM, Darius Buntinas <[email protected]> wrote:

...

Hi Geoff,

Is it possible for you to try this with fewer worker threads per node (leaving some idle cores on each node)?

Yes, this should have been an easy thing to try, but it crashed due to passing a 0 pointer to MPI. That may indicate that I ran out of memory and an unchecked malloc failed. I'll track that down and retry.

Here are results: 1 progress thread, 1 comm thread, 4 workers: 169.9694 s 1 progress thread, 1 comm thread, 3 workers: 160.2020 s This is using MPI_THREAD_MULTIPLE. Geoffrey