Re: [naviserver-devel] Interesting...

[Zoran V. <zv...@ar...>]

Am 02.02.2006 um 10:48 schrieb Bernd Eidenschink:

> Hi Zoran,
>
> Am Donnerstag, 2. Februar 2006 10:01 schrieb Zoran Vasiljevic:
>> Am 01.02.2006 um 17:15 schrieb Vlad Seryakov:
>>> On my machine with tcl 8.4.12
>>>
>>> starting 10 malloc threads...waiting....done:  0 seconds, 16003 usec
>>> starting 10 ns_malloc threads...waiting....done:  0 seconds, 13207
>>> usec
>>
>> I've been trying to see why I'm getting worse values with ns_malloc
>> as with malloc and it turned out to be that only in 2+CPU box I was
>> able to get ns_malloc outperform the malloc. On all single-cpu boxes
>> the times were 2 up to 4 times better with plain malloc!
>
> Single-CPU-box, Tcl 8.4.12; SuSE w/ Kernel 2.6.13-15.7-default.
>
> starting 10 malloc threads...waiting....done:  0 seconds, 36667 usec
> starting 10 ns_malloc threads...waiting....done:  0 seconds, 16620  
> usec
>
>> Does anybody have a single AND multi-cpu box to try out?
>
> Hyperthreading, but the Kernel sees 2 CPUs:
> (Same compilation of NaviServer; Kernel 2.6.13-15.7-smp)
>
> starting 10 malloc threads...waiting....done:  0 seconds, 13018 usec
> starting 10 ns_malloc threads...waiting....done:  0 seconds, 10599  
> usec
>

Damn, I still cannot believe...
Can you download the:

    http://www.archiware.com/www/downloads/memtest.c

and compile:

    gcc -o memtest memtest.c -I/usr/local/include -L/usr/local/lib - 
ltcl8.4g

or (for Tcl w/o symbols)

    gcc -o memtest memtest.c -I/usr/local/include -L/usr/local/lib - 
ltcl8.4

and give it a try on both machines?

This is what I get on single-cpu:

Tcl: 8.4.12
starting 16 malloc threads...waiting....done:  0 seconds, 94103 usec
starting 16 ckalloc threads...waiting....done:  0 seconds, 243616 usec

and on 2CPU:

Tcl: 8.4.12
starting 16 malloc threads...waiting....done:  0 seconds, 435068 usec
starting 16 ckalloc threads...waiting....done:  0 seconds, 151250 usec


Both are Mac OSX boxes. The single CPU is a 1.5GHz Mac Mini and the 2CPU
is a G4 with 2x800Mhz PowerPC.