first thing first, create a phpinfo page.
PHP Code:
<?php phpinfo(); ?>
Put it somewhere in the public side of your website (like the root of it) and bring it up. Then do a Find on Xcache. You should see something similar to:
Code:
XCache
XCache Support enabled
Version 1.3.0
Modules Built cacher
Readonly Protection N/A
Cache Init Time 2011-09-19 06:15:06
Cache Instance Id 1723
Opcode Cache enabled, 134,217,728 bytes, 4 split(s), with 8192 slots each
Variable Cache enabled, 134,217,728 bytes, 4 split(s), with 8192 slots each
Shared Memory Schemes mmap
If you don't, you don't have xcache installed properly.