[ZODB-Dev] More timing data

[Jeremy Hylton]

It's very difficult to measure process size in a meaningful way.  Do
you care what the peak memory utilization is?  Or do you care about
the working set size after a long time?  Or something else?

IIRC, when Jim and I measured the fsIndex() code we used a very large
storage (only recall size > 1GB, not number of objects) and considered
the RSS reported by top for a ZEO server.  Don't recall what activity
the server was performing.  The memory utilization was about 4x bigger
for the dict-based code.

Jeremy