# Fwd:  realpath() caching

- Thread: https://externals.io/message/11487
- Original archive: https://news-web.php.net/php.internals/11487
- Started by Andi Gutmans on 2004-07-22T22:18:32+00:00
- Messages: 4
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## #11487 — Andi Gutmans — 2004-07-22T22:18:32+00:00

URL: https://externals.io/message/11487#11487

Let me know if the attachment doesn't come through again and I'll post it 
on the web

>Date: Thu, 22 Jul 2004 14:30:00 -0700
>To: internals@lists.php.net
>From: Andi Gutmans <andi@zend.com>
>Subject: [PHP-DEV] `realpath()` caching
>
>Hi guys,
>
>Before 5.0.0 we promised we'll get something together for solving the 
>performance problems caused by Zend always `realpath()`'ing include files 
>(in expand_filepath()).
>Attached is a proposed implementation of such a cache. We tried to make it 
>as simple as possible and tests shows that it solves the performance problems.
>A few facts about it:
>a) Expiration and Cache size are still hardcoded and not INI options in 
>tsrm_virtual_cwd.h. Didn't want to go through the trouble of doing it 
>because we agree on the implementation.
>b) tsrm_hash.* is a full blown hash and not a stripped down hash which is 
>all that's needed for this. It'll be stripped down.
>c) In my opinion and tests, having a memory limit on the cache works great 
>because it makes sure the cache doesn't go crazy and even in like 16K of 
>memory you can usually cache all of the `realpath()`'s.
>d) Current expiration for an entry is 2 minutes which is also plenty.
>e) I wouldn't make it much more complicated or "smarter" than this because 
>it'll just add lots of code and will probably not perform much better.
>
>Comments welcome. Let's get this baby into PHP 5.1!
>
>Andi

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## #11488 — Tom Sommer — 2004-07-22T22:20:17+00:00

URL: https://externals.io/message/11487#11488 · In reply to: #11487

Andi Gutmans wrote:
> Let me know if the attachment doesn't come through again and I'll post 
> it on the web

It didn't

// Tom

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## #11489 — Andi Gutmans — 2004-07-22T22:22:56+00:00

URL: https://externals.io/message/11487#11489 · In reply to: #11487

http://snaps.php.net/~andi/

At 03:18 PM 7/22/2004 -0700, Andi Gutmans wrote:
>Let me know if the attachment doesn't come through again and I'll post it 
>on the web
>
> > […]

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## #11490 — Andrei Zmievski — 2004-07-22T22:37:45+00:00

URL: https://externals.io/message/11487#11490 · In reply to: #11487

> Let me know if the attachment doesn't come through again and I'll post it 
> on the web

It didn't.

- Andrei