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To: Colin Percival <colin.percival@wadham.ox.ac.uk>
From: "Poul-Henning Kamp" <phk@phk.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> 
Date: Sun, 30 Nov 2003 15:30:56 +0100
Message-ID: <26251.1070202656@critter.freebsd.dk>
cc: freebsd-current@freebsd.org
Subject: Re: user:sys time ratio 
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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.