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rodrigo-bruno / ng2c Goto Github PK

License: GNU General Public License v2.0

HTML 0.44% Makefile 1.60% Shell 0.41% Batchfile 0.15% C 1.27% Objective-C 0.07% C++ 69.73% Java 25.41% JavaScript 0.07% DTrace 0.21% Assembly 0.25% XSLT 0.39%

ng2c's Introduction

OpenJDK 8 HotSpot with the new collector: N-Generatioal Garbage Collector (NG2C)

Check our paper at ISMM'17

In order to test NG2C you first need to download and prepare the OpenJDK JVM build. Instructions regarding how to download and build the OpenJDK can be found at: http://hg.openjdk.java.net/jdk8/jdk8/raw-file/tip/README-builds.html

Then you need to replace the HotSpot source with the one in this repository. For example:

git clone https://github.com/paper-87/ng2c.git hotspot-ng2c
mv /path-to-openjdk/jdk8/hotspot /path-to-openjdk/jdk8/hotspot-bak
ln -s hotspot-ng2c /path-to-openjdk/jdk8/hotspot

Finally, build the OpenJDK JVM and the resulting JVM has NG2C incorporated. Remember that NG2C only works if G1 is enabled.

Additional Results

SPEC2008jvm pauses

Compress Benchmark:

Crypto Benchmark:

Mpegaudio Benchmark:

Scimark Benchmark:

XML Benchmark:

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ng2c's Issues

curious about object lifetime recorder

It seems OLR is not included in this repo. I'm very curious about how object graph analyzer works, since your brilliant paper does not give details on how it decide a object should allocted in which generation, and how it decide a new generation is necessary, besides predefined young/old generation.

curious about is there any modification to Javac

Hi there!

We are working on a project which also needs to mark out the new operation of some local variables. However, in our build environment (openjdk 8u102-b14), we haven't seen the RetentionPolicy.RUNTIME ElementType.LOCAL_VARIABLE @Gen annotation appears in the classfile. Even its name doesn't exist in the constant pool of the classfile. So we can do nothing but applied some ugly modification to JVM and JDK to make our project works.

However, I found that it's possible to directly use local variable annotations according to your brilliant paper. So I'm very curious about your openjdk version, the implementation of @Gen annotation and whether you have modified javac or not, since It seems that the code of @Gen annotation and javac are not included in this project.

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