Memory leak Post: 302526136

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Operating Systems Linux Red Hat Memory leak Post 302526136 by Corona688 on Monday 30th of May 2011 12:43:02 PM

05-30-2011

Registered User

Quote:

Originally Posted by reply.ravi

exactly problem is i have 12 Red hat servers. all the servers consuming 20% of memory except this one its use more than 95 % of memory.

We've already been over this. You just had the usual "oh my god linux uses free memory as cache" newbie freakout. Lots of memory being cached is completely normal, even expected behavior. If none of your other servers have any memory used as cache, they are the ones that have something wrong with them. Cache is good. Cache makes your system faster. Cache is also still "free" memory that your server will give up and hand over to programs should they ask for it.

Stop freaking out. Stop messing around with your VM modes -- disabling cache hurts your systems -- and undo the changes you did. (If you don't know how, just reboot your system.)

Quote:

also slow compare other rest servers.

This problem is completely unrelated to memory. It has 6 gigabytes of free memory. You don't have to keep prodding at VM modes. The memory's fine, or was until you started messing with it.

What, exactly, is slow? Forget the memory already and tell us what performance problems you're having. What's your load average?

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LEARN ABOUT DEBIAN

cache::sharedmemorycache

Cache::SharedMemoryCache(3pm)				User Contributed Perl Documentation			     Cache::SharedMemoryCache(3pm)

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

perl v5.12.4							    2009-03-01					     Cache::SharedMemoryCache(3pm)