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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