Date: Sun, 30 Nov 2003 15:30:56 +0100 From: "Poul-Henning Kamp" <phk@phk.freebsd.dk> To: Colin Percival <colin.percival@wadham.ox.ac.uk> Cc: freebsd-current@freebsd.org Subject: Re: user:sys time ratio Message-ID: <26251.1070202656@critter.freebsd.dk> In-Reply-To: Your message of "Sun, 30 Nov 2003 14:20:52 GMT." <5.0.2.1.1.20031130140203.031e8d08@popserver.sfu.ca>
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In message <5.0.2.1.1.20031130140203.031e8d08@popserver.sfu.ca>, Colin Percival writes: > I've got a system running 5.2-BETA from 27/11/03, with the malloc_abort, >malloc_junk, DEBUG=-g, DDB, INVARIANT*, and WITNESS* debugging options >changed (as was done in 5.1-RELEASE). > When running `make buildworld`, I see large amounts of sys time; eg, 27 >minutes user & 14 minutes sys for building 5.2, or 14 minutes user & 10 >minutes sys for building 4.9. I expected the ratio of user:sys to be much >larger than this, and mailing list traffic indicates that a 4:1 ratio is >typical. (FWIW, prior to changing the debugging options, the user:sys time >ratio was around 1:1.) I've seen UNIX systems have "typical" system/user splits from 1/9 to 9/1 it all depends on what you're doing. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.
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