An experiment with Java21 Virtual Threads and Clojure. Both examples just update an atom counter over 100000 threads, comparing the execution time between a virtual thread and a "real" thread.
This was a very quick thought experiment but there are some issues. Take these numbers with a grain of salt See this hacker news thread
Using the Clojure CLI, you can run this program like so:
clj src/main.clj
count: 100000
virtual start time (ms): 1722446540075
virtual end time (ms): 1722446540306
virtual elapsed time (ms): 231
count: 100000
real start time (ms): 1722446540311
real end time (ms): 1722446543667
real elapsed time (ms): 3356
count: 100000
virtual start time (ms): 1722449512852
virtual end time (ms): 1722449513318
virtual elapsed time (ms): 466
count: 100000
real start time (ms): 1722449513330
real end time (ms): 1722449520618
real elapsed time (ms): 7288