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Subject: [OMPI devel] Threshold for pinning down user-buffers
From: Siddhartha Jana (siddharthajana24_at_[hidden])
Date: 2014-05-23 17:39:36


Hi,
Is my understanding correct?
While servicing MPI_Send using eager protocol over openib, there is a
data-size threshold below which it is preferred to copy the contents of the
user-buffer to a pre-pinned buffer instead of directly pinning down the
user-buffer. If this is correct, how does one determine this threshold?

As always, thanks for the help
Sid