Re: [GHC] #15113: Do not make CAFs from literal strings

#15113: Do not make CAFs from literal strings -------------------------------------+------------------------------------- Reporter: simonpj | Owner: (none) Type: bug | Status: patch Priority: normal | Milestone: 8.8.1 Component: Compiler | Version: 8.2.2 Resolution: | Keywords: CAFs Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D4717 Wiki Page: | -------------------------------------+------------------------------------- Comment (by osa1): I started looking into this, but I realized that nofib can't be run with GHC 8.6 (and probably with HEAD) so I'll need to fix nofib first. What I've done so far is I implemented two counters: - A runtime counter for SRT traversals done by the GC - A compiler counter to count how many SRTs are generated (I'm also recording sum of sizes of the SRTs although this is probably not too useful) The runtime counter is printed with `+RTS -t`: {{{ <> }}} The "226752 SRT scavs" part is new, and it means that we scavenged 226752 SRTs. The compiler counter prints once per binding group and it looks like this: {{{ SRTs: 4 SRT(s), total size: 17 }}} This means that 4 SRTs are generated, and total size of all those SRTs are 17 words. The patch is here: https://github.com/osa1/ghc/commit/c46fe24a02591edd3ce7b6aa70246493826d218d I'll fix nofib first and then try to collect these numbers from nofib output. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15113#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler