Will this change do anything to fix:
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=8002283?
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Date: Mon, 4 Mar 2013 12:21:08 -0800
From: Mike Duigou <mike.dui...@oracle.com>
Subject: RFR: 8006593: Performance and compatibility improvements to
hash based Map implementations
To: "core-libs-dev@openjdk.java.net Libs"
<core-libs-dev@openjdk.java.net>
Message-ID: <79a5a703-12da-4c66-94f7-34534761d...@oracle.com>
Content-Type: text/plain; charset=us-ascii
Hello all;
The alternative hashing implementation introduced in 7u6 added an unfortunate
bottleneck to the initialization of HashMap and Hashtable instances. This patch
avoids the performance bottleneck of using a shared Random instance by using a
ThreadLocalRandom instead.
Along with this change are some additional performance improvements to further
reduce the overhead of the alternative hashing feature and generally improve
the performance of Hashtable or HashMap.
http://cr.openjdk.java.net/~mduigou/JDK-8006593/3/webrev/
Once review is completed here this patch will be proposed to JDK7u-dev for
integration into the next 7u performance/feature release.
Mike
