ParallelGC vs G1GC performance

[Richard Kolb]

Hello everyone,

I have done some basic performance benchmarking using my own home baked JMH
bench marks <https://github.com/AdoptOpenJDK/vmbenchmarks>
(A proper article to come)
Also I'm not a mirco benchmark expert, so some of these tests may be
incorrect from a micro benchmark point of view.

I used the following JVMs on Ubuntu Linux 64bit :
1.9.0-ea-b70 64bit
1.8.0_45 64bit

All values are in operations per second, so higher is better.
ParallelGC wins every time.


*Java 8* *Java 8 G1GC* *Java 9* *Java 9 G1GC*  *DynamicLanguages.groovy*
402.142 352.266 397.495 370.121  *ExceptionsBenchMark.throwRuntimeException*
885181.859 823326.931 910622.671 843228.203
*GeneratePoiWorkBook.generatePoiXLSWorkBook* 34205.392 28162.636 35129.546
28693.55  *GeneratePoiWorkBook.generatePoiXLSXWorkBook* 1125.074 980.061
1172.468 1012.47  *GeneratePrimeNumbersWithForLoop.generatePrime* 231035.868
230904.102 231405.021 230599.11  *Jackson.jsonMashal* 30019.081 22232.937
31908.426 24242.968  *Jackson.jsonUnmashal* 26942.264 20443.724 26736.986
22404.13  *Jackson.xmlMashalJackson* 22868.064 19657.647 23112.766 19947.204
*Jackson.xmlMashalJacksonStatic* 691051.644 441105.658 745753.342 487013.862
*Jackson.xmlUnmashalJackson* 11620.793 9143.764 11681.19 9915.961
*Jackson.xmlUnmashalJacksonStatic* 92897.944 70261.49 96174.969 73341.546
*JaxbMashalUnMashal.mashal* 988.781 925.565 2587.721 2345.568
*JaxbMashalUnMashal.mashalStatic* 164904.491 136569.201 207380.024
190202.406  *JaxbMashalUnMashal.unmashal* 873.89 783.885 1928.468 1721.395
*JaxbMashalUnMashal.unmashalStatic* 11348.605 7578.279 12184.689 8682.734
*Reflection.doReflection* 1676241.984 1572468.245 1738819.079 1738759.745
*RegularExpressions.validateEmail* 514686.286 476725.225 535478.698
490515.516
regards,
Richard.