What is Xcache and how to install Xcache
Xcache is a php accelerator. As of this writing the current version is 3.2.0. Check https://xcache.lighttpd.net for the latest version before beginning.
Xcache will not accelerate php running as a CGI, such as SUPHP. However it still could be used by some caching plugins, some that come with wordpress, to use caching. Xcache will accelerate mod_ruid2, (or any php as a dso), and php-fpm. Litespeed, provided on InterServer Shared Hosting also supports xcache even running with php suexec.
To begin, log into ssh.
wget https://xcache.lighttpd.net/pub/Releases/3.2.0/xcache-3.2.0.tar.gz tar -zxvf xcache-3.2.0.tar.gz cd xcache-3.2.0 phpize ./configure --enable-xcache make
non root user?
sudo make install
Now edit the PHP.ini file. The location can vary. Common locations are /usr/local/lib/php.ini
extension="xcache.so" ; ini only settings, all the values here is default unless explained ; select low level shm/allocator scheme implemenation xcache.shm_scheme = "mmap" ; to disable: xcache.size=0 ; to enable : xcache.size=64M etc (any size > 0) and your system mmap allows xcache.size = 64M ; set to cpu count (cat /proc/cpuinfo |grep -c processor) xcache.count = 2 ; just a hash hints, you can always store count(items) > slots xcache.slots = 8k ; ttl of the cache item, 0=forever xcache.ttl = 0 ; interval of gc scanning expired items, 0=no scan, other values is in seconds ; same as aboves but for variable cache xcache.var_size = 100M xcache.var_count = 1 xcache.var_slots = 8K ; default ttl xcache.var_ttl = 0 xcache.var_maxttl = 0 xcache.var_gc_interval = 300 xcache.test = Off ; N/A for /dev/zero xcache.readonly_protection = Off ; for *nix, xcache.mmap_path is a file path, not directory. ; Use something like "/tmp/xcache" if you want to turn on ReadonlyProtection ; 2 group of php won't share the same /tmp/xcache ; leave it blank(disabled) or "/tmp/phpcore/" ; make sure it's writable by php (without checking open_basedir) xcache.coredump_directory = "" ; per request settings xcache.cacher = On xcache.stat = On xcache.optimizer = On [xcache.coverager] ; per request settings ; enable coverage data collecting for xcache.coveragedump_directory and xcache_$ xcache.coverager = Off ; ini only settings ; make sure it's readable (care open_basedir) by coverage viewer script ; requires xcache.coverager=On xcache.coveragedump_directory = ""
When done restart apache