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Date: Thu, 5 Sep 2013 13:57:36 +0200
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To: Chris Wright <chrisw@aquacool.ltd.uk>
Cc: Bostjan Skufca <bostjan@a2o.si>, PHP Internals List <internals@lists.php.net>
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Subject: Re: [PHP-DEV] realpath_cache_size description in php.ini
From: jpauli@php.net (Julien Pauli)

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On Thu, Sep 5, 2013 at 12:29 PM, Chris Wright <chrisw@aquacool.ltd.uk>wrote:

> On Thu, Sep 5, 2013 at 10:07 AM, Julien Pauli < julienpauli@gmail.com >
> wrote:
> > On Wed, Sep 4, 2013 at 8:28 PM, Bostjan Skufca <bostjan@a2o.si> wrote:
> >
> > > Hi all,
> > >
> > > there is no description to be found about what the value of
> > > realpath_cache_size actually is.
> > >
> > > Is it
> > > a) max number of files/dirs in the cache or
> > > b) overall cache size?
> > >
> > > I checked php.ini samples distributed with PHP 5.5.3, and
> > > documentation
> > > here:
> > > http://php.net/realpath-cache-size
> > >
> > > Can please someone here provide an answer?
> > > Documentation and php.ini update would be nice too :)
> > >
> >
> > This is a little bit complicated.
> > The size represent the total number of bytes in the overall paths stored
> + some
> > garbage.
> > So if realpath cache stores an entry of say "/tmp/foo/bar.baz", then it
> will
> > add 16 bytes to the realpath cache size.
> > i.e, the longer the paths, the higher the cache size should be.
> > The formula is located at
> > http://lxr.php.net/xref/PHP_TRUNK/TSRM/tsrm_virtual_cwd.c#643
> >
> > The realpath_cache_size() PHP function documentation says "Returns how
> much
> > memory realpath cache is using." , and this is actually true, though it
> could be
> > more accurate on how this memory is calculated. The realpath_cache_size
> INI
> > description is "Determines the size of the realpath cache to be used by
> PHP.
> > This value should be increased on systems where PHP opens many files, to
> reflect
> > the quantity of the file operations performed." It's not very specific
> either,
> > I admit.
>
> > Julien.Pauli
>
> I've updated the docs for the config option to reflect Julien's
> explanation, and
> added a link to the config option docs from the function docs
>

Thx Chris, I didn't know if it were worth doing it, but you added the info,
so it is cool. Thank you.

Julien.Pauli

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