Date: Wed, 4 Dec 1996 20:29:02 -0500 (EST) From: Mark Mayo <mark@quickweb.com> To: Michael Hancock <michaelh@cet.co.jp> Cc: hackers@freebsd.org Subject: Re: New benchmarks to design Message-ID: <Pine.BSF.3.94.961204202201.5327A-100000@vinyl.quickweb.com> In-Reply-To: <Pine.SV4.3.95.961204161549.17926B-100000@parkplace.cet.co.jp>
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On Thu, 5 Dec 1996, Michael Hancock wrote: > I'd be interested in the following: [SNIP] > > worldStone: cd /usr/src; make world. This is important to people who > build world a lot. In observing, results posted on this list there's a > big difference when going from 486's to P5's and then to P6's. However, > it does have to move memory around and read and write temp files, object > files, and binaries, etc. I think Staelin paper said that performance > will be limited by (1+c/i) where c is compute seconds and i is io seconds. > If i is significant then improvements to c will have little effect. I > think we're approaching this. > This certainly seems to be the case for me these days.. I did a make world last night, and watched it a little more closely than I usually do =) I noticed that my CPU didn't really get less than 20% idle for the entire build. THe load average on the system hovered around .50 This would leave me to believe that I'm waiting on I/O more than waiting on the CPU. 1+c/i seems like a reasonable function... It takes about 3 hours and 15 minutes to do a complete make world (including contrib, with gcc, etc..) right now. I'm looking forward to getting a new disk, and splitting up the /usr/src and /usr/obj to see if this will speed up the build time. My disk is very full right now, and rather slow (about 3.5 MB/s write, 4.5 read) - maybe I'll borrow a few disks from school and try out ccd as well to see what the results are. It would be nice to have a benchmark/utility that could help aid in suggesting where bottlenecks are occuring! -Mark --------------------------------------------------- | Mark Mayo mark@quickweb.com | | RingZero Comp. vinyl.quickweb.com/mark | --------------------------------------------------- "To iterate is human, to recurse divine." - L. Peter Deutsch > Regards, > > > Mike Hancock > >
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