hash    memory          runtime    
              keys   sz    vsz   wall    user    sys         
ThreadShared  1K   22.6   90.1   0:02.6  0:01.6  0:00.1
ThreadCopy    1K   23.2   93.0   0:02:9  0:01.4  0:00.8
No Threads    1K    0.9    3.5   0:00.8  0:00.7  0:00.01

ThreadShared  1M   41.5  166.3   0:12.2  0:10.7  0:00.9
ThreadCopy    1M   untestable - froze up my system
No Threads    1M   45.0  180.0   0:06.9  0:04.8  0:02.1

*these numbers and their relationships are stable through
 multiple runs so they are unlikely to be artifacts of
 some sort of transient system state.