PHP Performance problem after upgrade to 5.1.6 or 5.2.0

Alexandre Biancalana ale at
Sat Feb 3 14:29:08 UTC 2007

Miroslav Lachman wrote:
> Hi all,
> I have performance problem with PHP after upgrading from PHP 5.1.4 to 
> newer version regardles if newer version is 5.1.6 or 5.2.0. I tested 
> both with same result.
> I have two same servers (IBM x336 with dual Xeon 3GHz and 2GB RAM) 
> serving one webapplication (loadbalancing). Both machines are running 
> FreeBSD 6.0 SMP + Apache 2.0.59. If both machines have PHP 5.1.4, 
> everything is fine and load is about 1.5 (Apache is running 16-20 
> childs).
> After upgrade to PHP 5.1.6 or 5.2.0, performance goes down - average 
> load is about 3-5 with peaks at 12-40 (in this peaks Apache starts to 
> run more childs, sometimes to MaxClients).
> Both machines are serving identical content with same requests per 
> second, both versions of PHP are compiled from ports with same options.
> Both have in loader.conf:
> accf_data_load="YES"
> accf_http_load="YES"

First of all you should upgrade the FreeBSD to 6.2-STABLE, since this 
has a LOT of improvements in the overall system. I would recommend you 
to disable HT too.


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