On Thursday 14 September 2006 19:28, Gary Corcoran wrote: > The confusing thing is that I thought 'real' time should be >= 'user' + > 'sys'. But here 'user' is much greater than 'real' for both machines! The > sense I got from the other messages in this thread is that 'user' time is > somewhat meaningless (i.e. unreliable as a measure) in a multi-CPU and/or > hyperthreading environment. Can you clarify?
user time = time spent in userland on all logical processors combined. The right equation is: real * ncpus > user + sys, where ncpus = number of active logical processors. In the optimal case (perfect parallelism): real * ncpus = user + sys - Pieter _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
