Resource: LCA14 Name: LCA14-508: OpenJDK performance evaluation & certification plans Date: 07-03-2014 Speaker: Edward Nevill, Andrew McDermott Video: https://www.youtube.com/watch?v=42P4XN9C07I&list=UUIVqQKxCyQLJS6xvSmfndLA Website: http://www.linaro.org/ Linaro Connect: http://connect.linaro.org/ Slide: https://www.slideshare.net/linaroorg/lca14-openjdk

1. Edward Nevill & Andrew McDermott, LCA14, Macau
OpenJDK Testing & Performance

2. Status Update
● C1/C2 Release with Tiered Compilation
● Both JDK8 / JDK7 supported
● Automated testing published daily
– 1 (known) critical fault
● Contemporary release with X86
– JDK8 Release late March/early April

3. Test Results
AARCH64 X86
Pass Fail Error Pass Fail Error
Hotspot 411 3 2 440 5 0
Langtools 2939 0 33 2940 0 25
JDK 5267 136 39 5216 187 5
Totals 8617 139 74 8956 192 30

4. Ongoing Testing
● JCK Testing
– Assist our partners with JCK certification
– We will not certify OpenJDK directly
– Currently 1 failure in > 20,000 compiler tests
● White box testing
– Ongoing testing to exploit known weak areas
– Cross testing with -XX options
– Eg. -Xcomp, -XX:CompileThreshold

5. Performance
● Performance testing using server scale
and micro benchmarks
– SPECJVM2008, SPECJBB2013, HADOOP
● Relative performance improvement
Zero Client Server
AARCH64 1 29.7 48.3
X86 1 30.0 45.1

6. Optimization Work
● Vectorization
● Pipeline Optimization
● C2 Peephole Optimizer
● Compressed References
– Implemented, default in server
● 64K & Huge (512Mb) pages
– Implemented

7. Optimisation Work
● Biased Locking
– Implemented, disabled
● CRC optimsation
● Allocation Prefetch
● String Optimisation
● Intrinsic optimisation

8. Automated Testing
● CI Loop in Lava
– Builds OpenJDK8 for OE
– JTREG & Mauve Subset on Model
● Automated Nightly Test on APM Board
– JTREG Test Suite against Server/Client
– Results published to AARCH64 mailing list
● Resources / Test results
– http://openjdk.linaro.org

9. More about Linaro Connect: http://connect.linaro.org
More about Linaro: http://www.linaro.org/about/
More about Linaro engineering: http://www.linaro.org/engineering/
Linaro members: www.linaro.org/members