Low perf with smp

Main problem is that query is done in a database of more
than 2Go and it 
will be difficult to mail it. ;=)
I try with several versions of mysql and php from mysql
4.1.18 to last 5.x 
and php 4.4.0 to 5.x and don't find significant change in
performance.
If it can help here is the loop.

 for($debut=$deb;$debut < $fin;$debut +=  $range){
    $end = $debut + $range;
    $query = "select avg(total)   from `histo_perfs_x`
 where id1 = 
'".$id1."' and id2 =
'".addslashes($id2)."' and date >
'".$debut."' and date 
< '".$end."'";
    $result = mysql_query($query) or die("La requete
:$query a echouee.");
    if(!$result)$databar_total[$j][$i]= 0;
    else {
      $ligne = mysql_fetch_array($result);
      if($ligne[0] !=
"")$databar_total[$j][$i]=$ligne[0]; else 
$databar_total[$j][$i]= "-";
    }
}


----- Original Message ----- 
From: "Mark Kirkwood" <markirparadise.net.nz>
To: "Eric" <ericdfree.fr>
Cc: "Lucas Holt" <lukefoolishgames.com>;
<freebsd-smpfreebsd.org>
Sent: Wednesday, April 05, 2006 2:32 AM
Subject: Re: Low perf with smp


> Eric wrote:
>> I know Pete but I downgrad because when installing
6.0 performance was 
>> half than with 4.11.
>> I done tests and tests but still have very low
perfs. I then downdgrad to 
>> 4.11 to see if it came from hardware or software.
>> Conclusion is that my test wich is consist of loop
of mysql query done by 
>> a php script take :
>>
>>             - 32 sec with 4.11 without SMP
>>            - 54 sec with 4.11 with SMP
>>            - 62 sec with 6.0 or 6.1 beta 4
>>
>> That's why actually I'm with 4.11.
>>
>> If you have any idea how improve perfs with 6.0 it
will be a pleasure.
>> Hardware is new dell 1850 with bi-xeon dualcore
2.8Ghz and scsi 15.000t 
>> HDD on raid1 perc4si 256Mo  controller.
>
> If you could post, or link to your mysql query and php
script, then I (or 
> in fact anyone) could try to reproduce this (I've got
two almost identical 
> machines running 6.0, so could downgrade one to 4.x.).
>
> In addition, what versions of php and mysql are you
using?
>
> Cheers
>
> Mark
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