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Heap fragmentation on HPUX

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Operating Systems HP-UX Heap fragmentation on HPUX
# 1  
Old 06-30-2010
Heap fragmentation on HPUX
Hi All,

We are facing issues on HPUX with the C heap region growing. We use a product for CRM by name ClarifyCRM and it uses a native layer for DB access. so there are best practices in place to actual control memory. recently we have seen issues that the C heap region is growing faster than expected and we have to bounce the weblogic server every day on the product ion system which are mission critical servers.

ClarifyCRM has provided a text utility to check the Diagnostic information of the serves how it is handling the DB related Objects both on the Java Heap and also on Native layer,but they look fine and ClarifyCRM also confirmed the same thing. The only option we left out was to see which part of the code in the native layer is causing the problem, so we decided to let the server crash and analyse the core for C Heap growth and related fragmentation.

Can someone tell me how to analyse Core and check the MemMap on the Process and Data Region on OS.

Regards
Ram
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LEARN ABOUT DEBIAN

cache::file::heap

Cache::File::Heap(3pm)					User Contributed Perl Documentation				    Cache::File::Heap(3pm)

NAME

       Cache::File::Heap - A file based heap for use by Cache::File

SYNOPSIS

	 use Cache::File::Heap;

	 $heap = Cache::File::Heap->new('/path/to/some/heap/file');
	 $heap->add($key, $val);
	 ($key, $val) = $heap->minimum;
	 ($key, $val) = $heap->extract_minimum;
	 $heap->delete($key, $val);

DESCRIPTION

       This module is a wrapper around a Berkeley DB using a btree structure to implement a heap.  It is specifically for use by Cache::File for
       storing expiry times (although with a bit of work it could be made more general).

       See LIMITATIONS below.

CONSTRUCTOR

	 my $heap = Cache::File::Heap->new( [$dbfile] );

       The heap constructor takes an optional argument which is the name of the database file to open.	If specified, it will attempt to open the
       database during construction.  A new Cache::File::Heap blessed reference will be returned, or undef if the open failed.

METHODS

       $h->open($dbfile)
	   Opens the specified database file.

       $h->close()
	   Closes a previously opened heap database.  Note that the database will be automatically closed when the heap reference is destroyed.

       $h->add($key, $val)
	   Adds a key and value pair to the heap.  Currently the key should be a number, whilst the value may be any scalar.  Invokes 'die' on
	   failure (use eval to catch it).

       $h->delete($key, $val)
	   Removes a key and value pair from the heap.	Returns 1 if the pair was found and removed, or 0 otherwise.

       ($key, $val) = $h->minimum()
	   In list context, returns the smallest key and value pair from the heap.  In scalar context only the key is returned.  Note smallest is
	   defined via a numerical comparison (hence keys should always be numbers).

       ($key, $vals) = $h->minimum_dup()
	   In list context, returns the smallest key and an array reference containing all the values for that key from the heap.  In scalar
	   context only the key is returned.

       ($key, $val) = $h->extract_minimum()
	   As for $h->minimum(), but the key and value pair is removed from the heap.

       ($key, $vals) = $h->extract_minimum_dup()
	   As for $h->minimum_dup(), but all the values are removed from the heap.

SEE ALSO

       Cache::File

AUTHOR

	Chris Leishman <chris@leishman.org>
	Based on work by DeWitt Clinton <dewitt@unto.net>

COPYRIGHT

	Copyright (C) 2003-2006 Chris Leishman.  All Rights Reserved.

       This module is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either expressed or implied. This program is free software;
       you can redistribute or modify it under the same terms as Perl itself.

       $Id: Heap.pm,v 1.6 2006/01/31 15:23:58 caleishm Exp $

perl v5.12.4							    2011-08-05						    Cache::File::Heap(3pm)