Josh Fisher

American computer scientist
the basketball player

Fisher holds a BA (1968) in mathematics (with honors) from New York University and obtained a Master's and PhD degree (1979) in Computer Science from The Courant Institute of Mathematics of New York University. He holds Spanish citizenship due to his Sephardic heritage.

In his Ph. D. dissertation, Fisher created the Trace Scheduling compiler algorithm and coined the term Instruction level parallelism to characterize VLIW, superscalar, dataflow and other architecture styles that involve fine grained parallelism among simple machine level instructions. Trace scheduling was the first practical algorithm to find large amounts of parallelism between instructions that occupied different basic blocks. This greatly increased the potential speed up for instruction level parallel architectures.

Because of the difficulty of applying trace scheduling to idiosyncratic systems (such as 1970s era DSPs) that in theory should have been suitable targets for a trace scheduling compiler, Fisher put forward the VLIW architectural style. VLIWs are normal computers, designed to run compiled code and used like ordinary computers, but offering large amounts of instruction level parallelism scheduled by a trace scheduling or similar compiler. VLIWs are now used extensively, especially in embedded systems. The most popular VLIW cores have sold in quantities of several billion processors.

Multiflow was founded to commercialize trace scheduling and VLIW architectures, then widely thought to be impractical. Multiflow's technical success and the dissemination of its technology and people had a great effect on the future of computer science and the computer industry.

1984 NSF Presidential Young Investigator's Award. (This award was meant to persuade promising faculty to stay at universities; financial grant to Yale University declined due to Fisher's leaving to start Multiflow.) 1987 Eli Whitney Connecticut Entrepreneur of the Year. 2003 Eckert–Mauchly Award given by The IEEE Computer Society and The Association for Computing Machinery, in recognition of 25 years of seminal contributions to instruction level parallelism, pioneering work on VLIW architectures, and the formulation of the Trace Scheduling compilation technique. The Eckert Mauchly is known as the computer architecture community's highest award. 2012 B. Ramakrishna Rau Award given by The IEEE Computer Society for the development of trace scheduling compilation and pioneering work in VLIW (Very Long Instruction Word) architectures.

Joseph A Fisher, Paolo Farabochi and Cliff Young: Embedded Computing: A VLIW Approach to Architecture, Compilers and Tools. Elsevier/Morgan Kaufmann, 2004. Joseph A Fisher: Trace Scheduling: A Technique for Global Microcode Compaction IEEE Trans. Computers, 30(7):478 490, 1981. Joseph A. Fisher: Very Long Instruction Word architectures and the ELI 512 ISCA '83 Proceedings of the 10th annual international symposium on Computer architecture, Pages 140–150, ACM, New York, NY, USA. Retrospective, 25 Years of ISCA, ACM, 1998. Joseph A. Fisher, John R. Ellis, John C. Ruttenberg, Alexandru Nicolau: Parallel Processing: A Smart Compiler and a Dumb Machine Symp. Compiler Construction, 1984: 37–47. Retrospective, Best of PLDI, ACM SIGPLAN Notices, 39(4):112, 2003. B. Ramakrishna Rau, Joseph A. Fisher: Instruction level parallel processing: history, overview, and perspective The Journal of Supercomputing Special issue on instruction level parallelism, Volume 7 Issue 1–2, May 1993. Also published by Kluwer Academic Publishers Hingham, MA, USA.