RFR(XS) 8059780: SPECjvm2008-MPEG performance regressions on x64 platforms
igor.veresov at oracle.com
Sat Nov 1 07:29:01 UTC 2014
Looks fine to me.
On Oct 31, 2014, at 2:55 PM, Vladimir Kozlov <vladimir.kozlov at oracle.com> wrote:
> We found performance regression (3-5%) on x64 after changes 8052081  were pushed. It is caused by changes in lcm.cpp. Those changes were done because Atom is in-order cpu and some benchmarks on Atom showed benefit from these changes.
> But Atom is not our core platform and the regression is big.
> Backout changes made in lcm.cpp in jdk9 and 8u40 (8052081 was backported to 8u40).
> We have RFEs to improve block's instructions order which may help both platforms:
> Tested with SPECjvm2008-mpegaudio.
>  https://bugs.openjdk.java.net/browse/JDK-8052081
More information about the hotspot-compiler-dev