Path: utzoo!attcan!uunet!lll-winken!lll-lcc!ames!elroy!cit-vax!mangler From: mangler@cit-vax.Caltech.Edu (Don Speck) Newsgroups: comp.unix.wizards Subject: Re: Vax 11/780 performance vs Sun 4/280 performance Summary: context switch rate Message-ID: <6820@cit-vax.Caltech.Edu> Date: 5 Jun 88 08:45:49 GMT References: <15875@brl-adm.ARPA> <2360@umd5.umd.edu> Organization: California Institute of Technology Lines: 10 In article <15875@brl-adm.ARPA>, weiser.pa@xerox.com writes: > Perhaps the 50ms. sleeper test is a red herring, and that pathological state is > not one that is ever seen under normal user loads. When I started using 4.3 BSD /etc/dump with two tape drives on this 780, I was getting 250 context switches per second among 8 processes. For another curious VAX/SUN comparison, notice how pipes on Sun-3's run half as fast when the buffer address is odd. No such penalty on vaxen. Don Speck speck@vlsi.caltech.edu {amdahl,ames!elroy}!cit-vax!speck