#11303: Pattern matching against sets of strings sharing a prefix blows up pattern checker -------------------------------------+------------------------------------- Reporter: bgamari | Owner: Type: bug | Status: new Priority: highest | Milestone: 8.0.1 Component: Compiler | Version: 7.11 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple performance bug | Test Case: T11303 Blocked By: | Blocking: Related Tickets: #11302 | Differential Rev(s): Phab:D1716, Wiki Page: | Phab:D1719 -------------------------------------+------------------------------------- Changes (by hvr): * owner: gkaracha => * status: closed => new * resolution: fixed => Comment: I just had matrix.h.h.o thrashing due to `text-icu` still requiring over 10GiB with yesterdays GHC 8.0 snapshot :-( I tried compiling `text-icu-0.7.0.1:Data.Text.ICU.Regex.Internal` on my workstation (with swap-space disabled) takes over 30GiB, until the OOM killer finally kicks in: {{{ [19687.231184] Out of memory: Kill process 18811 (ghc) score 929 or sacrifice child [19687.231186] Killed process 18811 (ghc) total-vm:1074146932kB, anon- rss:30410192kB, file-rss:0kB }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11303#comment:8 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler