On Tuesday, 02/10/2004 at 09:17 CST, "Little, Chris" <[EMAIL PROTECTED]> wrote: > at one time, was IBM recommending differently? i went to an introduction to > z/VM several years ago and the instructor was recommending 4 virtual CPU's > no matter how many real CPU's existed. He said that VM's multiprocessing > capability was superior to linux so it was better to queue processes to VM.
The number of virtual CPUs should not exceed the number of real CPUs. Each extra virtual CPU creates overhead that is exchanged for the advantages of parallelism. If you exceed the number of real CPUs, then the overhead is incurred, but without any advantage. Linux's n-way capabilities continue to improve. Anything you heard about Linux scalability "several years ago" is ancient history, only to be quoted at symposia discussing "Linux - The Early Years". ;-) Alan Altmark Sr. Software Engineer IBM z/VM Development
