Re: two-face collective scenario

James Cownie (jcownie@dolphinics.com)
Fri, 31 Jan 1997 16:30:40 +0000

> This means that parts of the program (here the parallelsolver) can
> be overlayed with the effort for three reduce operations.

The current two-faced (or two-phase) proposal only permits *one* two
phase collective operation in a communicator at a time, so, as your
example hints, you have to dup the communicator twice to give you
three communicators if you need three concurrent two-faced operations.

It doesn't seem elegant, but I suppose it works.

-- Jim

James Cownie
Dolphin Interconnect Solutions
Phone : +44 117 9071438
E-Mail: jcownie@dolphinics.com