Faster alternative implementations of Arrays.hashCode(byte[])

This repository contains implementations of Arrays.hashCode(byte[]), which beat the performance of the implementations in OpenJDK 24.0.1.

Benchmark Results

The figure below shows the benchmark results obtained on an AWS c5.metal instance with disabled Turbo Boost (P-state set to 1).

Running Benchmarks

To perform the benchmarks execute

sudo sh -c "echo 1 > /sys/devices/system/cpu/intel_pstate/no_turbo"; ./gradlew jmh; sudo sh -c "echo 0 > /sys/devices/system/cpu/intel_pstate/no_turbo"

Turbo Boost is turned off during the benchmark's execution to achieve more reproducible results on Intel CPUs. The benchmark results will be copied to the benchmark-results folder.

Generating Charts

To generate charts from the results stored in the benchmark-results folder, execute

python .\python\evaluation.py

in the root directory. The generated figures are put into the benchmark-results folder.