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Posted by Torgny Bjers on 09/27/05 08:24
Kevin Wang wrote:
>Hi All,
>
>My php5 web application needs to parse/marshall a bunch of large xml files into
>php5 objects at the beginning of handling each request. These xml files are
>static across all the requests and it is really time consuming to
>parse/marshall them into php5 objects.
>
>I am wondering if there is any means to cache these xml objects so that each
>request will not go through the same time consuming xml parsing/building
>operation. Serialization doesn't work in my case as deserialization is also
>very expensive.
>
>I am using Apache as the web server. What I am thinking is that if php5 allows
>us to keep certain objects (and their references) around across all the
>requests in a child process instead of cleaning all the object memory every
>time after a script/request is finished.
>
>I guess this problem is quite common for any large and complicated php
>applications.
>
>
If I had XML files that large, I would either switch database engine to
MySQL or PostgreSQL since that way I can page/load the data quicker than
parsing an XML document, or, I would consider the following:
Does the XML data change a lot? If not, why not cache the actual HTML
output instead of the data? That way you get n number of HTML documents
instead of one dynamic script, these files would only change when the
XML file has a changed filemtime(), and, it's easier for the server to
handle the requests. Take a look at:
http://pear.php.net/manual/en/package.caching.cache-lite.php
Cache_Lite is actually quite powerful since it allows you to cache
either the entire finished output, or just a part of the site and render
that from cache until the data has changed.
You could write down a whole series of cached documents either from one
request, or by running a cron under Linux or scheduler task under
Windows, and one user wouldn't get the brute of the waiting time when it
renders the cached parts.
Just some ideas... I hope I helped somehow.
Warm Regards,
Torgny
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