On Thu, May 7, 2009 at 11:33 AM, Devesh Sharma <devesh28@xxxxxxxxx> wrote: > Hello list, > I want to measure the exact time spent by some process in doing single > Context switch. How can I measure it? > The standard tool for that is lmbench, available from the "free software" section on http://www.bitmover.com/ . or One I found when I googled. Sure, you can try something like my clockwatcher.c : #include <stdio.h> #include <asm/msr.h> #include <linux/config.h> main () { unsigned long i, c, t ; for (i = 0; i < 1000; i++ ) { c = t = 0 ; rdtscl(t); do { c = t ; rdtscl(t); } while ((t-c) < 90) ; printf(" %u\n",(t-c+32)&-64); } } Or even this might be helpful to you. http://lkml.indiana.edu/hypermail/linux/kernel/9804.2/1142.html > -Devesh > > -- > To unsubscribe from this list: send an email with > "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx > Please read the FAQ at http://kernelnewbies.org/FAQ > > -- Regards, Sandeep. “To learn is to change. Education is a process that changes the learner.” -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
