#11666: Severe performance degradation in GHC 8.0.1 compared to GHC 7.10.x -------------------------------------+------------------------------------- Reporter: mrkkrp | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1-rc2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by mrkkrp): Replying to [comment:3 j.waldmann]:
don't put too much meaning into timings on travis.
see this discussion https://mail.haskell.org/pipermail/haskell- cafe/2016-February/123260.html and data in ticket #10818
put "-j2" in your build scripts.
Well, that ticket is about compilation time and mine is about performance of compiled code, I don't see how `-j2` can help here. While there are many things that can influence timing on Travis, there results are quite reproducible and now (test suite has grown bigger) GHC 7.10.x finishes successfully while 8.0.1 ends up with:
No output has been received in the last 10 minutes, this potentially indicates a stalled build or something wrong with the build itself.
This is really disappointing. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11666#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler