"At Sandia National Laboratories, we are currently engaged in research involving massively parallel processing. There is considerable skepticism regarding the viability of massive parallelism; the skepticism centers around Amdahl’s law, an argument put forth by Gene Amdahl in 1967 that even when the fraction of serial work in a given problem is small, say, s, the maximum speedup obtainable from even an infinite number of parallel processors is only l/s. We now have timing results for a 1024-processor system that demonstrate that the assumptions underlying Amdahl’s 1967 argument are inappropriate for the current approach to massive ensemble parallelism."
Gene Amdahl

January 1, 1970