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Sparks for CAFs get GC'd too eagerly

See http://stackoverflow.com/questions/36270447/frequent-gc-preventing-sparks-from-running-in-parallel/37751110#37751110

Trac metadata

Trac field	Value
Version	8.0.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Runtime System
Test case
Differential revisions
BlockedBy
Related
Blocking
CC	simonmar
Operating system
Architecture

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