On Wed, Jan 16, 2002 at 06:11:49PM -0000, [EMAIL PROTECTED] wrote: > On 15 Jan 2002, at 22:00, Robin Stevens wrote: > > On an otherwise idle Linux system, I've been noticing that the > > per-iteration speed has been varying during the course of a single > > primality test. Until Saturday afternoon I'd been getting a fairly > > consistent 0.188/0.189s time when the system was idle. It then increased > > to around 0.206s. It fell again last night to around 0.199s (see logs > > below - percentages trimmed for 80-character neatness). > > With stop/start or system reboots between? No restarts other than a system reboot on Sunday afternoon (to sort out a temperamental SCSI peripheral) - across which the speed seemingly remained constant.
> Probably the reason for the variability has something to do with the > way the program code and data get assigned to physical memory > locations. BTW Prime95 behaves similarly under Windows. My suspicion is that at some point the system was swapping slightly and the memory location of part of the program or the data changed. -- --------------- Robin Stevens <[EMAIL PROTECTED]> ----------------- Oxford University Computing Services ----------- Web: http://www.cynic.org.uk/ ------- (+44)(0)1865: 273212 (work) 273275 (fax) Mobile: 07776 235326 ------- _________________________________________________________________________ Unsubscribe & list info -- http://www.ndatech.com/mersenne/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
