RFR: 8024826: (s) : Remove alt-rt.jar, used by +AggressiveOps"

Mike Duigou mike.duigou at oracle.com
Tue Sep 17 00:16:42 UTC 2013

Hello all;

This is a cross-repo patch which disables building and enabling of the alt-rt.jar file. The alt-rt.jar file has been used with the -XX:+AggressiveOpts option (which will be remaining for other optimizations). This jar file formerly contained (closed-source) versions of several JDK classes which were optimized for very specific workloads. The implementations weren't generally applicable and in many cases induced performance drops. In particular since we will not be providing optimized implementations of the Java 8 streams API for the alternate versions of these classes the performance relative to the standard implementations would be poor. 

Over time we've (largely Alan Bateman) been trying to eliminate this difficult to support feature. With this changeset the alt-rt.jar feature is retired.


Ideally I would like a reviewer for both the HotSpot and JDK repos (could be the same person).


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