Inadequate usage messages

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I thought I'd try this tool to benchmark my cpu:

$ sysbench --version
sysbench 1.0.20

$ man sysbench
No manual entry for sysbench

$ sysbench
sysbench 1.0.20 (using system LuaJIT 2.1.1720049189)

Reading the script from the standard input:

^C

So I guess I need to specify --help to see how to run it:

$ sysbench --help
Usage:
  sysbench [options]... [testname] [command]

 ...

Compiled-in tests:
  fileio - File I/O test
  cpu - CPU performance test
  memory - Memory functions speed test
  threads - Threads subsystem performance test
  mutex - Mutex performance test

See 'sysbench <testname> help' for a list of options for each test.

OK, there's a cpu command:

$ sysbench cpu
sysbench 1.0.20 (using system LuaJIT 2.1.1720049189)

The 'cpu' test requires a command argument. See 'sysbench cpu help'

OK, need to add help to see how to run it:

$ sysbench cpu help
sysbench 1.0.20 (using system LuaJIT 2.1.1720049189)

cpu options:
  --cpu-max-prime=N upper limit for primes generator [10000]

But still nothing stated on how to run it? I.e what are the sub-commands? Also, the other commands seem to be the same.