[Swift-devel] scalability updates

[Ben Clifford]

I ran 066-many with 30000 jobs (10 x more than is in the SVN at the 
moment).

This eventually died, with it not being entirely clear to me why.

Throughout the run I was null pointer exceptions being thrown.

I also noticed a slowdown during the run - at the start more than 1000 
jobs are waiting for site selection; towards the end this was down to 
about 980.

This is on communicado.

The log for that run is 
http://www.ci.uchicago.edu/~benc/tmp/066-many-20090310-0853-ezpsjt20.log 

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