ow...@netptc.net put forth on 10/22/2010 5:18 PM: > Ron et al > See the following: > http://en.wikipedia.org/wiki/Amdahl's_law > Larry
Amdahl's law doesn't apply to capacity systems, only capability systems. Capacity systems are limited almost exclusively by memory, IPC/coherence, and I/O bandwidth, most often the last of the three. I think many folks forget about this "3rd rail" of system performance when they go shopping for the latest/greatest high frequency multi-core processor. Even mainstream desktops all ship with at minimum a dual core CPU today, and a single 7.2K RPM disk. Those two cores combined have I/O bandwidth a few thousand times greater than the disk. Until the average system has I/O bandwidth that's much closer to parity with the CPU bandwidth, we don't really need to worry about Amdahl's law, or any other scalability laws. -- Stan -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/4cc226f4.6040...@hardwarefreak.com
