Re: CPU Time slices, technotes.

What timeslice value is recommended for HP-UX 10.20? The default is 10 ticks. Ticks are 10ms each, so effectively the default is 100ms or 1/10s, same as the Sun default. HP 10.20 comes with a parameter template called "database server" (or something similar) which, among other changes, sets the timeslice down to 1. I have a Lawson consultant telling me that I really should have the timeslice at the default of 10. Along the same lines, I recently read an Informix TechInfo article by William Burton which recommends for 2 CPU VPs per physical CPU for HP systems with up to 4 processors. Does anyone have any experience with this? Does anyone know of further details such as: Platform (We have a K580's, K200's, K210's and K220's and are considering an N or V series) OS version (10.20 or 11.0) timeslice parameter value "Art S. Kagel" <kagel@bloomberg.net> on 02/18/99 12:02:26 PM Please respond to kagel@bloomberg.net To: informix-list@iiug.org cc: (bcc: Stephen Murray/AGInc) Subject: Re: CPU Time slices, technotes. David Tamburin wrote: > > This is a multi-part message in MIME format. > A few days ago I saw a message by Art S. Kagel. It mentioned changing > some kernal parameters to change timeslice to improve performance. > Could anyone tell me where I can dig this information up? OK Here are the Kernel parameters to adjust the Solaris system clock and timeslice down form the default 1/10 sec to 1ms. In /etc/system: set hires_tick=1 # or 2 - Number of system ticks per timeslice- 1 ms set hires_hz=1000 # Number of system ticks per second, ie set to ms Without this change you will be hard pressed to push the machine beyond about 65% utilization. After the change you can add processes and push utilization above 92%! Art S. Kagel