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.\" ========================================================================
.\"
.IX Title "Cache::SharedMemoryCache 3pm"
.TH Cache::SharedMemoryCache 3pm "2022-06-30" "perl v5.34.0" "User Contributed Perl Documentation"
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.SH "NAME"
Cache::SharedMemoryCache \-\- extends the MemoryCache.
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The SharedMemoryCache extends the MemoryCache class and binds the data
store to shared memory so that separate process can use the same
cache.
.PP
The official recommendation is now to use FileCache instead of
SharedMemoryCache.  The reasons for this include:
.PP
1) FileCache provides equal or better performance in all cases that
we've been able to test.  This is due to all modern \s-1OS\s0's ability to
buffer and cache file system accesses very well.
.PP
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.
.PP
3) FileCache works well on every \s-1OS,\s0 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.
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&  use Cache::SharedMemoryCache;
\&
\&  my %cache_options_= ( \*(Aqnamespace\*(Aq => \*(AqMyNamespace\*(Aq,
\&                        \*(Aqdefault_expires_in\*(Aq => 600 );
\&
\&  my $shared_memory_cache = 
\&    new Cache::SharedMemoryCache( \e%cache_options ) or
\&      croak( "Couldn\*(Aqt instantiate SharedMemoryCache" );
.Ve
.SH "METHODS"
.IX Header "METHODS"
See Cache::Cache for the \s-1API\s0 documentation.
.SH "OPTIONS"
.IX Header "OPTIONS"
See Cache::Cache for the standard options.
.SH "PROPERTIES"
.IX Header "PROPERTIES"
See Cache::Cache for the default properties.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Cache::Cache, Cache::MemoryCache
.SH "AUTHOR"
.IX Header "AUTHOR"
Original author: DeWitt Clinton <dewitt@unto.net>
.PP
Last author:     \f(CW$Author:\fR dclinton $
.PP
Copyright (C) 2001\-2003 DeWitt Clinton