From owner-freebsd-hackers  Sun Jan 20  4: 5: 5 2002
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To: "Duraid Madina" <duraid@fl.net.au>
Cc: freebsd-hackers@FreeBSD.ORG
Subject: Re: Insane performance regression? 
In-Reply-To: Your message of "Sun, 20 Jan 2002 15:28:34 +1100."
             <000001c1a16a$ec95cc50$022a17ac@simplex> 
Date: Sun, 20 Jan 2002 13:01:30 +0100
Message-ID: <2427.1011528090@critter.freebsd.dk>
From: Poul-Henning Kamp <phk@critter.freebsd.dk>
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One, check your malloc option settings.  FreeBSD-current defaults to the
AJ setting to flush out errors but this has a significant performance
hit.

See the malloc(3) manpage for details.

You don't say which version you were running before so this is the most
specific advice I can give you.

Poul-Henning

In message <000001c1a16a$ec95cc50$022a17ac@simplex>, "Duraid Madina" writes:
>Hi all,
>
>	I have a CPU-bound (well, 'malloc-bound' ;) program which takes
>about 20 seconds to run on a 'fast' PC (Pentium3-1000, Athlon XP1600
>etc) - the source is available as
>http://www.idesign.fl.net.au/malloc_pain/malloc_pain.tar.gz (NOTE: you
>*will* need GCC 3 (or more recent) to compile it). At any rate, I did
>the cvsup/buildkernel/buildworld thing this morning (I'm running
>5-CURRENT on an SMP box), and now that same program takes about half an
>hour to run, rather than 20 seconds. Curiously, it reports about 20%
>system time (whereas previously there was negligible system time)
>
>	Any idea what might be going on?
>
>	Duraid
>
>P.S. to run it:
>
>gcc -c mt19937b-int.c
>g++ Graph.cpp mt19937b-int.o
>./a.out
>
>Known to compile okay with GCC 3.0.3 and 3.1
>
>
>
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-- 
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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