Are you: Tired of send & receive? Tired of 100us of overhead per message? If yes, you should try Active Messages on the CM-5!! :^) :^) :^) :^) :^) :^) :^) :^) :^) Seriously: we've developped a new communication substrate based on Active Messages that provides more flexibility than send&receive and that doesn't require the buffering which makes send&receive slow. Short messages can be sent in 1.4us and received in 1.6us on the CM-5 (down from about 80us with TMC's current message passing library). Implementing remote fetches and other shared-memory style operations is real easy. If you have access to a CM-5 you can ftp the sources from sprite.berkeley.edu in tam/cmam-2-4.tar.Z and try it out. A ``getting-started'' document and man pages are included. Active Messages were presented at this year's Int'l Symposium on Computer Architecture and a postscript copy of the paper is included in the distribution (available separately in tam/isca92.ps). If you have questions, comments or problems, please send me e-mail. Thorsten von Eicken tve@cs.berkeley.edu (510) 642-8299 Computer Science Div. --- EECS University of California at Berkeley Berkeley, CA 94720