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I have a 32bit 10.04 server has 32gb ram

I am running opencart e-commerce sites (php)

Max How much ram can use by opencart? (32gb or 4gb?)

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Why not just run a 64bit kernel? That will almost certainly be faster. – poolie Mar 16 '12 at 2:45
this is an existing server runs alot of sites. – sordumsoruyu Mar 16 '12 at 3:06
isn't any RAM limit in 64bit? – sordumsoruyu Mar 16 '12 at 3:07
In 64-bit the only limit is how much memory the hardware can accept. – poolie Mar 16 '12 at 6:05

3 Answers

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If you use a PAE-kernel a 32 bit operating systems like yours, can use up to 64 Gb of memory (RAM).

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mm, kinda, not from one process. – poolie Mar 16 '12 at 2:44
Every php code is a single process isn't it? Not whole opencart application. In this case, max limit is 64 gb, am I right? – sordumsoruyu Mar 16 '12 at 3:03
up vote 2 down vote

If you have a PAE kernel installed, your 32 bit operating system should be able to address up to 64 GB of RAM.

As far as I know, each single process should be able to address not more than 4 GB RAM. Now since opencart is a PHP application and I assume that each visit of your website by another browser spwans a new PHP process, your system and therefore opencart should be able to use more than 4 GB of RAM.

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+1 for the extra info (and to motivate each other :) ) – Henk Mar 15 '12 at 20:07
Every php code is a single process isn't it? Not whole opencart application. In this case, max limit is 64 gb, am I right? – sordumsoruyu Mar 16 '12 at 2:56
Yes, typically you'll have multiple php processes, and they can each get >3GB. If no single request wants more than 3GB, you're fine. I don't know if that's your situation or not. – poolie Mar 16 '12 at 6:08
@poolie 3gb or 4gb? – sordumsoruyu Mar 16 '12 at 20:16
I don't think apps get the full 4GB with a 32-bit kernel. Not sure exactly where the cutoff is these days. – poolie Mar 17 '12 at 22:34
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Also, PHP has various tuning parameters, including memory_limit, which may be as high as 128MiB if you're running a recent version. Check your php.ini file for details.

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