The create threads workload is a very simple micro-benchmark as part of the osbench suite. The description is quite literally:
Create 100 threads and wait for them to finish. Each thread does nothing (just return).
and the running is not much more exciting than that:
Benchmark: Create/teardown of 100 threads... 9.629726 us / thread
It creates all the threads, waits for them to join back and reports the best time it found in five seconds of running the benchmark.