How to increase memory limit for PHP over 2GB

Question

I have an problem increasing memory limit for PHP as Apache module   If I put following directive in Apache configuration  that work OK   php value memory limit 1 99G   But over 2GB do not work  it s restore this value back to 128MB   What is the problem here  I need more memory for some PDF related tasks   Server is Debian 2 6 32-5-amd64  1 SMP  PHP 5 3 3-7 squeeze13 with 12GB physical RAM

User · Answer

For unlimited memory limit set -1 in memory limit variable   ini set  memory limit    -1

User · Answer

I had the same problem with commandline php even when ini set  memory limit    -1    was set  so the limit is in php not from apache   You should check if you are using the 64bit version of php   Look at this question about Checking if code is running on 64-bit PHP to find out what php you are using   I think your php is compiled in 32 bit

User · Answer

I would suggest you are looking at the problem in the wrong light   The questtion should be  what am i doing that needs 2G memory inside a apache process with Php via apache module and is this tool set best suited for the job    Yes you can strap a rocket onto a ford pinto  but it s probably not the right solution   Regardless  I ll provide the rocket if  you really need it    you can add to the top of the script    ini set  memory limit   2048M      This will set it for just  the script   You will still need to tell apache to allow that much for a php script  I think

User · Answer

You should have 64-bit OS on hardware that supports 64-bit OS  64-bit Apache version and the same for PHP  But this does not guarantee that functions that are work with PDF can use such big sizes of memory  You d better not load the whole file into memory  split it into chunks or use file functions to seek on it without loading to RAM

User · Answer

You can also try this   ini set  max execution time    -1    ini set  memory limit    -1    ignore user abort true   set time limit 0

User · Answer

For others who are experiencing with the same problem  here is the description of the bug in php   patch https   bugs php net bug php id 44522

User · Answer

Have you tried using the value in MB    php value memory limit 2048M   Also try editing this value in php ini not Apache

User · Answer

Input the following to your Apache configuration   php value memory limit 2048M

[php] How to increase memory limit for PHP over 2GB?

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