System perforamance 4.x vs. 5.x and 6.x

Uwe Doering gemini at
Fri Feb 15 09:59:45 UTC 2008

Adrian Chadd wrote:
> On 15/02/2008, Uwe Doering <gemini at> wrote:
>> Have you tried sorting this list alphabetically?  Believe it or not,
>>  when I tried to use Apache 1.3.x with PHP 5.2.x with extensions in
>>  arbitrary order I got inexplicable crashes, too.
> Ah, stuff like "apache-ssl init's the SSL library, then php + ssl
> init's the SSL library, and stuff gets funny."

Right.  It has probably to do with some linking and initialization 
details of the dynamic libraries involved.  However, in my case the 
offending interaction seemed to be just between the PHP extension 
modules.  To fix the problem I didn't have to change the load order of 
the Apache modules.

Since then I have a line in my PHP upgrade notes that reminds me of 
sorting the extension list as a last step.  This is certainly a 
pragmatic approach, but for lack of time I didn't bother getting 
acquainted with the PHP internals, and those of the libs involved, to 
find the root cause.


Uwe Doering         |  EscapeBox - Managed On-Demand UNIX Servers
gemini at  |

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