betrcode / java-virtual-threads-demo

A demo of virtual threads in Java 19. Virtual threads are in preview in Java 19. The objective of the demo is to have a somewhat fair comparison of the performance between a fixed thread pool and virtual threads when doing blocking work (not CPU intensive work).

Demo of performance of virtual threads in Java 19

A demo of virtual threads in Java 19.

Virtual threads are in preview in Java 19.

The objective of the demo is to have a somewhat fair comparison of the performance between a fixed thread pool and virtual threads when doing blocking work (not CPU intensive work).

The expectation is that virtual threads will have better resource utilization and give higher throughput.

Disclaimer: This is work-in-progress and it is not at all certain that this is a fair comparison.

Prerequisites

Java 19 needs to be installed.

Arguments

1. Arg 1: on/off - determines if virtual threads is on or off
2. Arg 2: integer - number of executions to run

How to run with Maven

Without virtual threads:

mvn compile exec:java -Dexec.args="off 5000"

With virtual threads:

mvn compile exec:java -Dexec.args="on 5000"

How to package and run JAR

Package as JAR

mvn package

Run as JAR without virtual threads

java --enable-preview -jar target/vtd-1.0-SNAPSHOT.jar off 5000

Run as JAR with virtual threads

java --enable-preview -jar target/vtd-1.0-SNAPSHOT.jar on 5000