Performance of Scala compared to Java

Main goal of this project is to show that it is possible to write idiomatic Scala code which run on par with Java in terms of execution speed and memory consumption.

Hardware required

• CPU: 2 cores or more
• RAM: 2Gb or greater

Software installed required

• JDK: 1.7.0_x or newer
• sbt: 0.13.x

Building & running benchmarks

Use following command-line instructions to build from sources and run all benchmarks:

sbt -Dsbt.log.noformat=true "run .*" >outX.txt

For printing format of mask, other options & list of available profilers use following commands:

sbt -Dsbt.log.noformat=true "run -h" > help.txt
sbt -Dsbt.log.noformat=true "run -lprof" > profilers.txt

NOTE: First time compiling on JDK 7 can require bigger size of thread stack:

sbt -J-Xss1m compile

Test result descriptions

Results of running on different environments:

out_8u40.txt

Intel(R) Core(TM) i7-2640M CPU @ 2.80GHz (max 3.50GHz), RAM 12Gb DDR3-1333, Ubuntu 14.10, Oracle JDK 1.8.0_40-b25 64-bit

out_8u31.txt

Intel(R) Core(TM) i7-2640M CPU @ 2.80GHz (max 3.50GHz), RAM 12Gb DDR3-1333, Ubuntu 14.10, Oracle JDK 1.8.0_31-b13 64-bit

out_7u76.txt

Intel(R) Core(TM) i7-2640M CPU @ 2.80GHz (max 3.50GHz), RAM 12Gb DDR3-1333, Ubuntu 14.10, Oracle JDK 1.7.0_76-b13 64-bit