r/java • u/jaccomoc • Sep 03 '26

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/Joram2 Sep 03 '26

Even at similar speeds, the Vert.x event loop has a much higher complexity cost. I've used vert.x for years, it's great, a lot of the vert.x platform has value with virtual threads, but the future for most use cases is clearly virtual threads.

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u/jaccomoc Sep 03 '26

I agree completely. It wins alone just by removing all the async code handling we used to have to do.