Once again...what do I do in order to enable hyperthreading on my Linux/P4 machine? Also what was Dave talking about when he said 'siblings'? Thanks! learner --- Sapan Bhatia <sapan.bhatia@labri.fr> wrote: > Hi, > > That doesn't answer Seth's question to my mind, and > I'm still interested in > the answer. If '+''s are the wasted cycles, then if > * is an average of the > cycles wasted, if there are 'n' competing processes, > and k is the > avg. utilization for a hyperthreaded CPU, then > (trivially) > 1 - *^n < k < 1 - *^2n where the max. possible > improvement, (*^n - *^2n) > should be quite low and insignificant in some cases, > and it'd be interesting > to know when it's actually significant (or if > there's a better measure than > avg. cpu utilization). > > Regards, > Sapan > > > > The ``+'' are the wasted cycles, i.e. there *is* a > runnable > > CPU/process, but it is not scheduled, because the > current CPU/process > > time quanta is not expired yet. Of course the > total time does not > > increse with the number of wasted cycles, because > there are times when > > no CPU/process is runnable. > > > > ~velco > > -- > > Kernelnewbies: Help each other learn about the > Linux kernel. > > Archive: > http://mail.nl.linux.org/kernelnewbies/ > > FAQ: http://kernelnewbies.org/faq/ > > > > > -- > Kernelnewbies: Help each other learn about the Linux > kernel. > Archive: > http://mail.nl.linux.org/kernelnewbies/ > FAQ: http://kernelnewbies.org/faq/ > __________________________________________________ Do you Yahoo!? HotJobs - Search new jobs daily now http://hotjobs.yahoo.com/ -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
