Newsgroups: php.internals
Path: news.php.net
Xref: news.php.net php.internals:60373
Mailing-List: contact internals-help@lists.php.net; run by ezmlm
Received-SPF: pass (pb1.pair.com: domain gmail.com designates 209.85.213.42 as permitted sender)
MIME-Version: 1.0
In-Reply-To: <000e01cd269a$06f15230$14d3f690$@php.net>
References: <4F9E2173.50005@garfieldtech.com>
	<000e01cd269a$06f15230$14d3f690$@php.net>
Date: Mon, 30 Apr 2012 10:05:35 +0200
Message-ID: <CAEZPtU4kw1HbRJr=zoEY8nFiBYEdNRka0rp2O+fbmtEPM2xaNg@mail.gmail.com>
To: Uwe Schindler <thetaphi@php.net>
Cc: Larry Garfield <larry@garfieldtech.com>, internals@lists.php.net
Content-Type: text/plain; charset=ISO-8859-1
Subject: Re: [PHP-DEV] readfile() memory usage
From: pierre.php@gmail.com (Pierre Joye)

hi!

On Mon, Apr 30, 2012 at 8:25 AM, Uwe Schindler <thetaphi@php.net> wrote:

> - If the underlying stream allows MMAP, it will use memory mapping (mapping
> file to *virtual* memory) and copy the mapped buffer to output. Please note
> memory mapping does *not* load the file into memory, it only *maps* the file
> contents to virtual memory like a swap file
> (http://en.wikipedia.org/wiki/Mmap).

Some additional notes:

mmap may use "normal" memory too, depending on the options (not sure
which are used exactly with readfile or stream's mmap).

About php memory usage, one has to use an external tools to actually
see this memory usage as it is not managed by the zend memory manager.


Cheers,
-- 
Pierre

@pierrejoye | http://blog.thepimp.net | http://www.libgd.org