A few things about memcache:
Memcache is a daemon, meaning it runs as a separate service on your machine. Just like MySQL runs as a separate service. In fact, to use memcache in PHP you have to connect to it, just like MySQL.
Think of memcache as the
$_SESSION variable for PHP, but instead of it working on a per-user basis, it runs over the entire application — like MySQL. In fact, you can use memcache as you session handler for PHP.
This is how I got memcache to work on my windows machine:
- Download memcache from code.jellycan.com/memcached/ [grab the ‘win32 binary’ version]
- Install memcache as a service:
- Unzip and copy the binaries to your desired directory (eg. c:\memcached) [you should see one file, memcached.exe] – thanks to Stephen for the heads up on the new version
- If you’re running Vista, right click on memcached.exe and click Properties. Click the Compatibility tab. Near the bottom you’ll see Privilege Level, check “Run this program as an administrator”.
- Install the service using the command: c:\memcached\memcached.exe -d install from the command line
- Start the server from the Microsoft Management Console or by running one of the following commands: c:\memcached\memcached.exe -d start, or net start "memcached Server"
Now that you have memcache installed, you’ll have to tie it in with PHP in order to use it.
- Check your php extensions directory [should be something like: C:\php\ext] for php_memcache.dll
If you don’t have any luck finding it, try looking at one of these sites:
– downloads.php.net/pierre/ [thanks to Henrik Gemal]
– pecl4win.php.net/ext.php/php_memcache.dll [currently down]
– www.pureformsolutions.com/pureform.wordpress.com/2008/06/17/php_memcache.dll for PHP 5.2.*
– kromann.info/download.php?strFolder=php5_1-Release_TS&strIndex=PHP5_1 for PHP 5.1.* [thanks, Rich]
- Now find your php.ini file [default location for XP Pro is C:\WINDOWS\php.ini] and add this line to the extensions list:
- Restart apache
- Run this code to test the installation: [found on www.php.net/memcache]
<?php $memcache = new Memcache; $memcache->connect("localhost",11211); # You might need to set "localhost" to "127.0.0.1" echo "Server's version: " . $memcache->getVersion() . "<br />\n"; $tmp_object = new stdClass; $tmp_object->str_attr = "test"; $tmp_object->int_attr = 123; $memcache->set("key",$tmp_object,false,10); echo "Store data in the cache (data will expire in 10 seconds)<br />\n"; echo "Data from the cache:<br />\n"; var_dump($memcache->get("key")); ?>
If you see anything but errors, you are now using memcache!
Memcached, by default, loads with 64mb of memory for it’s use which is low for most applications. To change this to something else, navigate toHKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\memcached Server in your registry, find the ImagePath entry and change it to look something like this:
“C:\memcached\memcached.exe” -d runservice -m 512
Now when you start the service via net start “memcached Server”, it will run with 512mb of memory at it’s disposal.
[Thanks to Travis]
If anyone is wondering what other options can be set (other than the memory limit), run “memcached -help” in a command prompt window. Then modify the ImagePath command line per this article with the desired switches and values.