Re: 64 bit RFC, #2 and #3 yes

From: Date: Wed, 05 Feb 2014 22:12:24 +0000
Subject: Re: 64 bit RFC, #2 and #3 yes
References: 1 2 3 4 5  Groups: php.internals 
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Anatol,


There might be more, I gave a glance look at it. I'm curious to see how
much memory real scripts will use with the branch.


In fact, while 64 bit programs take more memory that 32 bit ones, the
exact advantage of the 64 bit systems is that the amount of that memory is
bigger. So comparing a program on 32 bit system with 2G (without
extensions) and the same program on 64 bit system with 8G memory - while
the program size itself increases, the relative increase opposing to the
system memory is smaller. Significant memory increase is only to expect
when using huge amounts of data split into small pieces, say you have
millions of string buffers of 3 byte length - in that case it'll need the
same amount of pointers which are 4 vs 8 bytes big on 64 bit. Stack
variables are of less importance for that.


I meant on 64 bit vanilla PHP vs the branch


Regards

Anatol



Andrey

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