r/java • u/jaccomoc • 22h 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 21h ago

TLDR virtual threads are better. 

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u/neopointer 2h ago

And don't use reactor, vertx or anything similarly hard to debug and maintain.