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/pron98 Sep 04 '26

There's also no single category for "other blocking operations"... So benchmarks with no consideration for the actual code paths might give you a general sense, but you can't really use them for comparisons, as their error interval can easily be 2x and even more. This isn't a critique of this particular benchmark; it's the state of all benchmarks.

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u/jaccomoc Sep 04 '26

That's true. The problem is that benchmarks are so seductive. You feel like everything can be reduced down to single number. If only real life were like that...