What is the maximum value I can set in php.ini? I've noticed that I have a php.ini file on a per-site basis. My Linode is a 512 and I'm not sure if I can assign all 512MB? There's about a dozen sites running on my Linode.

Thanks

As much as you like. However setting it to 512mb would mean a single php process could use all your ram and kill your server.

32mb is normally sufficient, some apps require 64mb and some really heavy image processors require up to 128mb

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Thanks for the info.

I'm running a script that parses the DOM of some large html pages and this gives memory errors at 128MB. I doubled it and it seems fine ...

You doubled it to 256mb? You might want a bigger linode you won't be able to process many concurrent requests using that amount.

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What do you mean by concurrent requests exactly? It's a script that runs just for me, not a public site.

For a script only you run then it probably wont matter, concurrent requests is requests processing at the same time, so I wouldn't run two of those scripts at once.

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Understood, thanks for your help.