On Tue, 30 Nov 2004 12:07:46 -0000, Pete Lewis <[EMAIL PROTECTED]> wrote: > Also, unless you take your hyperthreading off, with just one index you are > searching with just one half of the CPU - so your desktop is actually using > a 1.5GHz CPU for the search. So, taking account of this its not too > surprising that they are searching at comparable speeds..... > > HTH > Pete
Actually, that isn't how hyperthreading works. The "second" CPU in a hyperthreaded system should only run threads when the "main" cpu is waiting on another task, like a memory access. The second, or sub CPU is only a virtual processor. There aren't really two chips on board. New multicore processors will actually have more than one processor in one chip. Problems can arise when you are using a HT processor on an operating system that doesn't know about HT technology. The OS should only schedule jobs to run on the sub CPU under very specific circumstances. This is one of the major reasons for the scheduler overhaul in Linux 2.6. The default scheduler in 2.4 would assign threads to the sub CPU that shouldn't have been, and those threads would suffer from resource starvation. --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
