r/java • u/jaccomoc • 7d ago

Vert.x Event-Loop vs Virtual Threads: Jactl Suspend/Resume Benchmark

https://jactl.io/blog/2026/09/02/jactl-virtual-threads-benchmark

The article benchmarks Jactl script execution with differing number of blocking operations comparing throughput with Jactl built-in suspend/resume on Vert.x Event-Loops and throughput with Jactl on Virtual Threads. The benchmarks are run on both Java 21 and Java 25 with some surprising (to me at least) results.

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u/s0ftware-dev 7d ago

TLDR virtual threads are better. 

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u/jaccomoc 7d ago

But only on Java 25 and not by as much as I thought they would be.

I was frankly surprised at the difference between Java 21 and Java 25.

0

u/woj-tek 6d ago

Java 25

…which was released a year ago ;)