[GHC] #13225: Fannkuch-redux time regression from join point patch
#13225: Fannkuch-redux time regression from join point patch -------------------------------------+------------------------------------- Reporter: dfeuer | Owner: Type: bug | Status: new Priority: normal | Milestone: 8.4.1 Component: Compiler | Version: 8.1 Keywords: JoinPoints | Operating System: Unknown/Multiple Architecture: | Type of failure: Runtime Unknown/Multiple | performance bug Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- According to [https://perf.haskell.org/ghc/#revision/8d5cf8bf584fd4849917c29d82dcf46ee75dd... Gipeda], the join point rework caused an impressive 99.9% drop in allocations in fannkuch-redux, but an 8.57% increase in its run-time. Looking at the graph, it appears that this is not just noise. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13225 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#13225: Fannkuch-redux time regression from join point patch -------------------------------------+------------------------------------- Reporter: dfeuer | Owner: Type: bug | Status: new Priority: normal | Milestone: 8.4.1 Component: Compiler | Version: 8.1 Resolution: | Keywords: JoinPoints Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj):
join point rework caused an impressive 99.9% drop in allocations in fannkuch-redux, but an 8.57% increase in its run-time
That's is truly weird. It'd be good to understand why. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13225#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#13225: Fannkuch-redux time regression from join point patch -------------------------------------+------------------------------------- Reporter: dfeuer | Owner: Type: bug | Status: new Priority: normal | Milestone: 8.4.1 Component: Compiler | Version: 8.1 Resolution: | Keywords: JoinPoints Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by nomeata): * cc: nomeata (added) -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13225#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#13225: Fannkuch-redux time regression from join point patch -------------------------------------+------------------------------------- Reporter: dfeuer | Owner: Type: bug | Status: new Priority: normal | Milestone: 8.4.1 Component: Compiler | Version: 8.1 Resolution: | Keywords: JoinPoints Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by heisenbug): * cc: heisenbug (added) -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13225#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#13225: Fannkuch-redux time regression from join point patch -------------------------------------+------------------------------------- Reporter: dfeuer | Owner: Type: bug | Status: new Priority: normal | Milestone: 8.4.1 Component: Compiler | Version: 8.1 Resolution: | Keywords: JoinPoints Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by int-index): * cc: int-index (added) -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13225#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#13225: Fannkuch-redux time regression from join point patch -------------------------------------+------------------------------------- Reporter: dfeuer | Owner: Type: bug | Status: new Priority: normal | Milestone: 8.4.1 Component: Compiler | Version: 8.1 Resolution: | Keywords: JoinPoints Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by sibi): * cc: sibi (added) -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13225#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
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