Fastest Word Count in Java

For StackOverflow question Most efficient way to increment a Map value in Java.

Compared libraries:

• JDK (HashMap)
• Eclipse Collections
• fastutil
• HPPC
• HPPC-RT
• Koloboke implementation library
• Koloboke Compile
• Trove

Build & run:

$ gradle jmh

Results on Intel i7-2600 @ 3.40GHz, Java 9 build 120: jmh-results.txt, interactive results, static plot results: