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Bug 237864

Summary:	[heapwalker] heap model can use less memory
Product:	profiler	Reporter:	Tomas Hurka <thurka>
Component:	Engine	Assignee:	Tomas Hurka <thurka>
Status:	RESOLVED FIXED
Severity:	normal	Keywords:	VISUALVM
Priority:	P3
Version:	7.3
Hardware:	All
OS:	All
Issue Type:	ENHANCEMENT	Exception Reporter:

Description Tomas Hurka 2013-10-31 14:22:53 UTC

org.netbeans.lib.profiler.heap.StringSegment has a big HashMap<Long,Long>. In 700M heap dump, it has about 600000 entries and consumes over 50M of memory. The memory consumption of the StringSegment instance can be improved by replacing HashMap<Long,Long> with a special type of map. It uses long[] to store the key/values pairs (similar idea is used in IdentityHashMap, where key/value pairs are stored in Object[]). Such map consumes around 15M in the same heap dump.

Comment 1 Tomas Hurka 2013-10-31 15:49:55 UTC

Fixed in profiler-main

changeset:   266015:ca4b9d2ce94a
user:        Tomas Hurka <thurka@netbeans.org>
date:        Thu Oct 31 16:30:02 2013 +0100
summary:     issue #237864, use LongHashMap instead of HashMap<Long,Long>