NAME

       Cache::SharedMemoryCache -- extends the MemoryCache.

DESCRIPTION

       The SharedMemoryCache extends the MemoryCache class and binds the data store to shared memory so that
       separate process can use the same cache.

       The official recommendation is now to use FileCache instead of SharedMemoryCache.  The reasons for this
       include:

       1) FileCache provides equal or better performance in all cases that we've been able to test.  This is due
       to all modern OS's ability to buffer and cache file system accesses very well.

       2) FileCache has no real limits on cached object size or the number of cached objects, whereas the
       SharedMemoryCache has limits, and rather low ones at that.

       3) FileCache works well on every OS, whereas the SharedMemoryCache works only on systems that support
       IPC::ShareLite.  And IPC::ShareLite is an impressive effort -- but think about how hard it is to get
       shared memory working properly on *one* system.  Now imagine writing a wrapper around shared memory for
       many operating systems.

SYNOPSIS

         use Cache::SharedMemoryCache;

         my %cache_options_= ( 'namespace' => 'MyNamespace',
                               'default_expires_in' => 600 );

         my $shared_memory_cache =
           new Cache::SharedMemoryCache( \%cache_options ) or
             croak( "Couldn't instantiate SharedMemoryCache" );

METHODS

       See Cache::Cache for the API documentation.

OPTIONS

       See Cache::Cache for the standard options.

PROPERTIES

       See Cache::Cache for the default properties.

SEE ALSO

       Cache::Cache, Cache::MemoryCache

AUTHOR

       Original author: DeWitt Clinton <dewitt@unto.net>

       Last author:     $Author: dclinton $

       Copyright (C) 2001-2003 DeWitt Clinton