[GHC] #11542: Profiling call count frequently 0 when it shouldn't be
#11542: Profiling call count frequently 0 when it shouldn't be -------------------------------------+------------------------------------- Reporter: augustss | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.8.3 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- Here's an example (lines shortened): {{{ FUNCTION MODULE CALLS addinMTypeM Cortex.Stem.Exp.Addin 212462 56309 0.0 0.0 0.1 0.0 addinMTypeM'' Cortex.Stem.Exp.Addin 212463 0 0.0 0.0 0.1 0.0 memoize Cortex.Utils.Memo 212464 0 0.0 0.0 0.1 0.0 memoizeIO Cortex.Utils.Memo 212465 0 0.0 0.0 0.1 0.0 addinMTypeM' Cortex.Stem.Exp.Addin 212467 13799 0.0 0.0 0.1 0.0 }}} Maybe I don't understand the profile info, but here is my interpretation. addinMTypeM is called 56309 times, and then it calls addinMTypeM'' 0 times, which calls memoize 0 times, which calls memoizeIO 0 times, which calls addinMType' 13799. How can a function that was called 0 times call another function 13799 times? My profile are full of the 0 entries. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11542 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#11542: Profiling call count frequently 0 when it shouldn't be -------------------------------------+------------------------------------- Reporter: augustss | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.8.3 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: | -------------------------------------+------------------------------------- Changes (by j.waldmann): * cc: j.waldmann (added) -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11542#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#11542: Profiling call count frequently 0 when it shouldn't be -------------------------------------+------------------------------------- Reporter: augustss | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Profiling | Version: 7.8.3 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: | -------------------------------------+------------------------------------- Changes (by thomie): * component: Compiler => Profiling -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11542#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#11542: Profiling call count frequently 0 when it shouldn't be -------------------------------------+------------------------------------- Reporter: augustss | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Profiling | Version: 7.8.3 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 nad): I don't know if this is related, but I've encountered an example where the entries count is 0, but the ''individual'' %time and %alloc numbers are substantial. This is using GHC 7.10.3. I found a report of a similar problem: Profiling trouble by Ferenc Wagner (https://mail.haskell.org/pipermail/glasgow-haskell- users/2003-January/004727.html). The code attached to the report compiles if you modify some haskell98 imports: {{{ sed -ri -e 's/import Complex/import Data.Complex/' -e 's/import qualified List/import qualified Data.List as List/' *hs ghc --make Show2.hs -O -auto-all -prof ./Show2 +RTS -p }}} When I ran this sequence of commands now I obtained a profiling report with the following line: {{{ main Main 109 0 10.5 0.8 10.5 0.8 }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11542#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
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