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.