Date: Wed, 6 Feb 2002 17:42:30 -0500 From: Garance A Drosihn <drosih@rpi.edu> To: current@FreeBSD.ORG Subject: Re: Performance of -current vs -stable Message-ID: <20020212021137.422E89EF20@okeeffe.bestweb.net>
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At 12:10 AM -0500 2/6/02, Garance A Drosihn wrote:
>One simple test I tried was that I have a copy of the freebsd cvs
>repository in /usr/cvs/free, on it's own partition. Each system
>has it's own /usr/src, of course. I cvsup'ed /usr/cvs/free, and
>then did a
> time cvs status >/dev/null
>in each /usr/src, on each system.
The popular vote fingered the WITNESS option as the culprit for
the significant slowdown I noticed in -current. I compiled a
kernel which did nothing but turn that off, and here is an
updated chart of my simple-minded benchmark:
On current On current On stable
+witness NO witness (no witness)
---------- ---------- ----------
real 7m 43.392s 5m 9.443s 4m 53.100s in the /usr/src
user 0m 11.692s 0m 11.223s 0m 4.203s for current
sys 3m 4.601s 0m 17.353s 0m 2.248s
real 6m 40.322s 1m 57.438s 2m 39.361s in the /usr/src
user 0m 10.531s 0m 9.474s 0m 6.653s for stable
sys 4m 28.863s 0m 12.527s 0m 9.480s
So, things are quite reasonable for my purposes if I turn off
the WITNESS kernel option, and leave all the other debugging
stuff active.
reminder: The above is obviously not a scientific benchmark!
It was just something adequate enough to show a rough idea
of the performance I was "feeling".
Thanks for the pointers. Now I'll try recompiling the rest of
the ports I have on my -stable system, and see if I can't keep
my office machine running in -current instead of -stable...
--
Garance Alistair Drosehn = gad@eclipse.acs.rpi.edu
Senior Systems Programmer or gad@freebsd.org
Rensselaer Polytechnic Institute or drosih@rpi.edu
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