[GHC] #14192: Change to 1TB VIRT allocation makes it impossible to core-dump Haskell programs

[GHC]

#14192: Change to 1TB VIRT allocation makes it impossible to core-dump Haskell
programs
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        Reporter:  nh2               |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Runtime System    |              Version:  8.0.2
      Resolution:                    |             Keywords:  gdb,
                                     |  debugging
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #9706             |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonmar):

 I'm surprised this is an issue, I'm sure I've core-dumped processes with
 the 1TB address space without any problems. The core files look huge, but
 they're sparse.

 I wonder what's being dumped.

 We could easily add a flag to change the size of the region, but adding a
 flag to disable the region completely would add a performance overhead
 because we'd have to check the flag repeatedly in the inner loop of the
 GC, so I'd really like to avoid that if possible.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14192#comment:4>
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