#14490: TTG Snags -------------------------------------+------------------------------------- Reporter: alanz | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.3 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: #14482 | Differential Rev(s): Wiki Page: | ImplementingTreesThatGrow | -------------------------------------+------------------------------------- Comment (by alanz): Comparing compile performance for current master (with TTG) and after reverting. 1. Check timing on home.smart-cactus.org, for current master at 25f36bd7ba6899be6c720292528c56bc35e0f089 a. Make mk/validate.mk which overrides the mk/flavours/validate.mk one Set: `GhcStage2HcOpts = -ddump-timings -O -dcore-lint -dno-debug- output` b. Run {{{#!sh $ make maintainer-clean $ CPUS=6 ./validate >> master-validate.log 2>&1 }}} 2. Revert the prior TTG commits on branch `wip/revert-ttg-2017-11-20` GHC/master - 438dd1cbba13d35f3452b4dcef3f94ce9a216905 - e3ec2e7ae94524ebd111963faf34b84d942265b4 - 47ad6578ea460999b53eb4293c3a3b3017a56d65 haddock/ghc-head - 01eeeb048acd2dd05ff6471ae148a97cf0720547 - 73a26af844ac50b8bec39de11d64452a6286b00c - 9f054dc365379c66668de6719840918190ae6e44 - 134a7bb054ea730b13c8629a76232d73e3ace049 3. Run the timing again {{{#!sh $ make maintainer-clean $ CPUS=6 ./validate >> revert-validate.log 2>&1 }}} Results to follow -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14490#comment:16 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler