I had an application running on a server using PHP4 and MYSQL4 under a memory limit 80M. I have upgraded that application to PHP5 and MYSQL5 and moved it on a new server running PHP5 and MYSQL5 as well as Apache 2. However, it needed a memory limit = 512 M to make it run.
Any one has an idea why is that?

This is very urgent, if anyone has faced a similar issue and have a suggestion please reply.

Thanks in advance.

    maybe you have a script somewhere that doesn't stop running. Sometimes when trying to read in some files, it's possible you get a memory allocation error. Could you give us the error? Usually it says something about 'trying to allocate xxx bytes'.

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