#14192: Change to 1TB VIRT allocation makes it impossible to core-dump Haskell programs -------------------------------------+------------------------------------- Reporter: nh2 | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Runtime | Version: 8.0.2 System | Keywords: gdb, | Operating System: Unknown/Multiple debugging | Architecture: | Type of failure: Runtime Unknown/Multiple | performance bug Test Case: | Blocked By: Blocking: | Related Tickets: #9706 Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- GHC 8.0.2 on Linux changed the memory allocator to always allocate 1TB virtual memory on startup (#9706). I now have a production Haskell program running in a loop and would like to debug where it is stuck, on another machine, thus attaching with `gdb -p` and running `generate-core-file`. But core dumping takes forever, I Ctrl-C'd it when it reached 140 GB in size (my machine only has 64 GB RAM btw.); after the Ctrl-C the size of the core file on the file system was reported as `1.1T` (probably it's a sparse file now). Is there a workaround for this? For example, if I could dump only the resident or actually allocated pages, that would probably help. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14192 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler