Date: Sat, 25 Apr 1998 03:56:39 -0500 (EST) From: "John S. Dyson" <toor@dyson.iquest.net> To: robert@cyrus.watson.org Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: Context switch time Message-ID: <199804250856.DAA07440@dyson.iquest.net> In-Reply-To: <Pine.BSF.3.96.980425041329.28708A-100000@fledge.watson.org> from Robert Watson at "Apr 25, 98 04:17:45 am"
next in thread | previous in thread | raw e-mail | index | archive | help
> > Hi, > > I was wondering what the average context switch time across a syscall > invocation is, also, how long it takes to switch in a different process. > Presumably just on a Pentium 100ish processor. Is this data I can > retrieve from the kernel profiler? mi_switch and tsleep both appear in > the profiling data, but it is not clear to me that this includes the time > for the switch to kernel context, etc. > > Thanks, > > Robert N Watson > For a first start, try lat_ctx from lmbench. I believe that it does a token passing scheme with pipes, so it won't tell you exactly what you want, but might be ballpark. John To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199804250856.DAA07440>