It’s not really a benchmark, nor silly but it had a silly bug in the driver script (runit.sh). The bug is fixed and the updated tar archive is available here: http://oaktable.net/articles/slob-silly-little-oracle-benchmark
If you compare before and after results you may find that your AWR rates per second for physical I/O and Logical I/O are different. That’s due to the bug. The old version scoped a sleep in the AWR reporting period! Yes, a silly bug in a silly little Oracle benchmark. Only a slob would let that linger.