FreeBSD 6.1 6.2 C++ stl set.clear() very slow
Tom Evans
tevans.uk at googlemail.com
Fri May 4 15:42:22 UTC 2007
On Fri, 2007-05-04 at 18:03 +0400, valiy wrote:
<SNIP>
> TEST1
> FreeBSD idx 6.1-RELEASE-p10 FreeBSD 6.1-RELEASE-p10 #1: Wed Nov 8
> 18:59:20 UTC 2006 root at idx:/usr/src/sys/amd64/compile/SMP amd64
>
>
> 19:07:15 root at idx3 ~ $ g++ ./test_set.cpp
> 19:07:23 root at idx3 ~ $ ./a.out
> filling
> clearing
> done
> alloc time 1.938 clear time 15.290
<SNIP>
> TEST2
> FreeBSD proton 5.5-RELEASE FreeBSD 5.5-RELEASE #0: Mon Jun 26 21:47:56
> MSD 2006 root at proton:/usr/src/sys/i386/compile/PROTON i386
> [root at proton ~]# g++ test_set.cpp
> [root at proton ~]# ./a.out
> filling
> clearing
> done
> alloc time 2.529 clear time 5.685
>
<SNIP>
>
> TEST3:
> FreeBSD hotdog 4.9-RELEASE FreeBSD 4.9-RELEASE #3: Fri Jul 1 19:35:10
> MSD 2005 root at hotdog:/usr/src/sys/compile/HOTDOG i386
>
> 19:18 root at puma vvolodin $ ./a.out
> filling
> clearing
> done
> alloc time 4.001 clear time 0.305
>
> pentium3 2x700MHz
>
> how to fix?
>
(Couldnt see your 6.2 result, did I snip it?)
Upgrade to 6.2, or for better results, 7-CURRENT
$ uname -a && ./stl_test
FreeBSD zoot.mintel.co.uk 7.0-CURRENT FreeBSD 7.0-CURRENT #1: Wed Mar 28
12:29:25 BST 2007 root at zoot.mintel.co.uk:/usr/obj/usr/src/sys/ZOOT
i386
filling
clearing
done
alloc time 2.252 clear time 0.441
(CURRENT with no INVARIANTS nor WITNESS, and MALLOC_PRODUCTION defined)
$ uname -a && ./stl_test
FreeBSD bob.mintel.co.uk 6.2-RELEASE FreeBSD 6.2-RELEASE #0: Thu Jan 18
14:18:05 GMT 2007 root at bob.mintel.co.uk:/usr/obj/usr/src/sys/BOB
i386
filling
clearing
done
alloc time 2.705 clear time 5.691
Is your test for 4 using GCC 2.95 ? C++ in GCC 2.95 is «interesting» in
the shortcuts it takes.
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