RFR: 8024826: (s) : Remove alt-rt.jar, used by +AggressiveOps"
david.holmes at oracle.com
Tue Sep 17 07:21:01 UTC 2013
Looks like there is one test that knows it has to exercise the
* @run main/othervm Clone
* @run main/othervm -XX:+AggressiveOpts Clone
but it's harmless to leave the second invocation.
I didn't see anything in JDK or hotspot regression tests that would be
Once you are ready I will sponsor the hotspot patch for you through
On 17/09/2013 12:37 PM, David Holmes wrote:
> Reviewed both hotspot and jdk changes.
> Thumbs up and good riddance! :)
> How do you propose to handle the coordination of the push?
> On 17/09/2013 10:16 AM, Mike Duigou wrote:
>> 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).
More information about the core-libs-dev