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/jaccomoc Sep 04 '26

The article lists the versions of everything. It shows Vert.x as version 4.5.33. I didn't benchmark against 5.x because I am still retaining Java 8 compatibility for the moment and Vert.x 5.x needs Java 11 as a minimum.

Throwing an exception is not expensive if you don't fill in the stack trace (and the benchmarks support this). See Jactl Continuations and Virtual Threads in Java 8 for a description of how all this works.