Thorsten von Eicken, David E. Culler, Seth Copen Goldstein and Klaus Erik Schauser
EECS Department
University of California, Berkeley
Technical Report No. UCB/CSD-92-675
March 1992
http://www2.eecs.berkeley.edu/Pubs/TechRpts/1992/CSD-92-675.pdf
The design challenge for large-scale multiprocessors is (1) to minimize communication overhead, (2) allow communication to overlap computation, and (3) coordinate the two without sacrificing processor cost/performance. We show that existing message passing multiprocessors have unnecessarily high communication costs. Research prototypes of message driven machines demonstrate low communication overhead, but poor processor cost/performance. We introduce a simple communication mechanism, Active Messages, show that it is intrinsic to both architectures, allows cost effective use of the hardware, and offers tremendous flexibility. Implementations on nCUBE/2 and CM-5 are described and evaluated using a split-phase shared-memory extension to C, Split-C. We further show that active messages are sufficient to implement the dynamically scheduled languages for which message driven machines were designed. With this mechanism, latency tolerance becomes a programming/compiling concern. Hardware support for active messages is desirable and we outline a range of enhancements to mainstream processors.
BibTeX citation:
@techreport{von Eicken:CSD-92-675, Author = {von Eicken, Thorsten and Culler, David E. and Goldstein, Seth Copen and Schauser, Klaus Erik}, Title = {Active Messages: a Mechanism for Integrated Communication and Computation}, Institution = {EECS Department, University of California, Berkeley}, Year = {1992}, Month = {Mar}, URL = {http://www2.eecs.berkeley.edu/Pubs/TechRpts/1992/5569.html}, Number = {UCB/CSD-92-675}, Abstract = {The design challenge for large-scale multiprocessors is (1) to minimize communication overhead, (2) allow communication to overlap computation, and (3) coordinate the two without sacrificing processor cost/performance. We show that existing message passing multiprocessors have unnecessarily high communication costs. Research prototypes of message driven machines demonstrate low communication overhead, but poor processor cost/performance. We introduce a simple communication mechanism, Active Messages, show that it is intrinsic to both architectures, allows cost effective use of the hardware, and offers tremendous flexibility. Implementations on nCUBE/2 and CM-5 are described and evaluated using a split-phase shared-memory extension to C, Split-C. We further show that active messages are sufficient to implement the dynamically scheduled languages for which message driven machines were designed. With this mechanism, latency tolerance becomes a programming/compiling concern. Hardware support for active messages is desirable and we outline a range of enhancements to mainstream processors.} }
EndNote citation:
%0 Report %A von Eicken, Thorsten %A Culler, David E. %A Goldstein, Seth Copen %A Schauser, Klaus Erik %T Active Messages: a Mechanism for Integrated Communication and Computation %I EECS Department, University of California, Berkeley %D 1992 %@ UCB/CSD-92-675 %U http://www2.eecs.berkeley.edu/Pubs/TechRpts/1992/5569.html %F von Eicken:CSD-92-675