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\address{Susan Hinrichs\\
	 School of Computer Science\\ 
	Carnegie Mellon University\\ 
	Pittsburgh, PA 15213-3891\\
	(412) 268-1425 (phone)\\
	shinrich@cs.cmu.edu}

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\opening{Dear Susanne,}

Thank you for sending us your paper about communication on the
Delta. It's good to know that other people are interested in
all-to-all communication.

I'm not all that surprised that the Scott algorithm did not perform
very well for you. We found that synchronizations were the key to good
performance. On our iWarp implementations, the ``balanced'' and the
message passing versions performed nearly the same unless the phases
were separated by barriers. Our later measurements on the T3D also
show the need for congestion controlling synchronization.

I've enclosed a copy of our tech report that includes some additional
performance numbers that we presented at SPAA. We will keep an eye out
for your Parallel Computing article.

\closing{Sincerely,}

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