-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hello Julian,
Julian Elischer wrote: > Krassimir Slavchev wrote: > >> >> Also, I am able to set HZ=100000 but the thread switching time is still >> ~1ms. > > You must be talking about the time that a thread can run before it is > pushed out by other threads? I know I've seem many x 10,000 context > switches in some cases, i.e. look at very high interrupt rates > etc. so I guess I'm not sure what you are measuring.. Okay, I have a thread with: while(1) { clock_gettime(CLOCK_REALTIME, &tv); nanosleep(&delay, NULL); clock_gettime(CLOCK_REALTIME, &tv2); timespecsub(&tv2, &tv); } If the delay is configured to be 0 < delay < 1ms I always get ~1ms delay. Since nanosleep() is a cancellation point this means that the scheduler will switch to another thread. If the delay = 0 I get ~1600ns delay. Yes. You are right. This is "the time that a thread can run before it is pushed out by other threads". Is there a way to decrease this time? > > at one time the scheduling quantum was independent of Hz. > I am not sure how true that is now.. > It seems to be independent of HZ. Best Regards > > _______________________________________________ > freebsd-performance@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-performance > To unsubscribe, send any mail to > "[EMAIL PROTECTED]" > -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (FreeBSD) iD8DBQFJCsoDxJBWvpalMpkRAteuAJ9Jd8ICvPSiWB/4eGquUunoclpeXgCgjqyE vBXA0vGoRgsQ9eHZ/YwR/lw= =AjjC -----END PGP SIGNATURE----- _______________________________________________ freebsd-performance@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-performance To unsubscribe, send any mail to "[EMAIL PROTECTED]"