According to "man proc", there are 10 milliseconds in a kernel jiffy. I suppose that's only applicable to kernel versions 2.6.*. Can I count on that for future kernels? If not, is there some way I can dig it out of /proc or somewhere else? Norman Shapiro 798 Barron Avenue Palo Alto CA 94306-3109 (650) 565-8215 norm at dad.org