Path: utzoo!attcan!uunet!husc6!bloom-beacon!gatech!emcard!sdba!stan From: stan@sdba.UUCP (Stan Brown) Newsgroups: comp.unix.wizards Subject: Re: Vax 11/780 performance vs Sun 4/280 performance Message-ID: <264@sdba.UUCP> Date: 31 May 88 17:32:33 GMT References: <14968@brl-adm.ARPA> Organization: S. D. Brown & Assoc. Atlanta, Ga Lines: 22 Posted: Tue May 31 13:32:33 1988 > What your DEC salesperson may have heard, undoubtedly very indirectly, is that > there is a knee in the performance curve of the Sun-4/280 at > 15 processes > ready-to-run. This has nothing to do with > 15 users: more like a load average > of > 15. Do your vaxes ever run with a load average of > 15? If not, ok. But, > if they EVER hit 16 or 17, watch out on the Sun-4's: I can trivially get my > Sun-4 completely wedged so I have to reboot with L1-A by just starting 19 little > processes which sleep for 100ms, wake-up and sleep again. This doesn't even > raise the load average (but amounts to a load average of 19 to the context > switching mechanism, although not to the cpu). > > And the Sun-3's are no better: the knee there is >7 processes. > > -mark Realizing that if this *is* true on the RoadRuner it will be true at a much lower number, does anyone know if such a thing is true on it ? -- Stan Brown S. D. Brown & Associates 404-292-9497 (uunet gatech)!sdba!stan "vi forever"