[GHC] #16065: Stack squeezing during context switches makes for non-determinism in allocations

[GHC]

#16065: Stack squeezing during context switches makes for non-determinism in
allocations
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        Reporter:  sgraf             |                Owner:  (none)
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:  ⊥
       Component:  Runtime System    |              Version:  8.6.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #4450, #8861      |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonmar):

 I think we want to leave stack squeezing as it is. How would you make it
 deterministic? Just saying "only squeeze if we're about to switch to a
 different thread" would just move the problem to concurrent programs.
 `+RTS -V0` is a solution that works for both single-threaded and
 concurrent programs, because it forces the context switches to happen at
 deterministic times.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16065#comment:9>
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