[Swift-devel] too much slow down.

[Ben Clifford]

With the recent changes made to the scheduler to deal with bad sites in a 
multisite run, the behaviour in the presence of a single bad site and no 
good sites seems to be that a run will sit for a very long time rather 
than the previous behaviour of failing pretty fast.

This is perhaps unpleasant, perhaps not; but its a significant change to 
behaviour.

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