Re: [GHC] #2462: Data.List.sum is slower than 6.8.3

[GHC]

#2462: Data.List.sum is slower than 6.8.3
--+-
 Reporter:  simonmar  |  Owner:  simonpj
 Type:  run-time performance bug  | Status:  closed 
 Priority:  high  |  Milestone:  6.10.1 
Component:  Compiler  |Version:  6.8.3  
 Severity:  normal| Resolution:  invalid
 Keywords:| Difficulty:  Unknown
 Testcase:|   Architecture:  Unknown
   Os:  Unknown   |  
--+-
Comment (by simonmar):

 unreproducible for me too now.

-- 
Ticket URL: 
GHC 
The Glasgow Haskell Compiler___
Glasgow-haskell-bugs mailing list
Glasgow-haskell-bugs@haskell.org
http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs

Re: [GHC] #2462: Data.List.sum is slower than 6.8.3

[GHC]

#2462: Data.List.sum is slower than 6.8.3
--+-
 Reporter:  simonmar  |  Owner:  simonpj
 Type:  run-time performance bug  | Status:  closed 
 Priority:  high  |  Milestone:  6.10.1 
Component:  Compiler  |Version:  6.8.3  
 Severity:  normal| Resolution:  invalid
 Keywords:| Difficulty:  Unknown
 Testcase:|   Architecture:  Unknown
   Os:  Unknown   |  
--+-
Changes (by simonpj):

  * status:  reopened => closed
  * resolution:  => invalid

Comment:

 I did that and it's still fine. Re-open if you think otherwise!

 Simon

-- 
Ticket URL: 
GHC 
The Glasgow Haskell Compiler___
Glasgow-haskell-bugs mailing list
Glasgow-haskell-bugs@haskell.org
http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs

Re: [GHC] #2462: Data.List.sum is slower than 6.8.3

[GHC]

#2462: Data.List.sum is slower than 6.8.3
--+-
 Reporter:  simonmar  |  Owner:  simonpj 
 Type:  run-time performance bug  | Status:  reopened
 Priority:  high  |  Milestone:  6.10.1  
Component:  Compiler  |Version:  6.8.3   
 Severity:  normal| Resolution:  
 Keywords:| Difficulty:  Unknown 
 Testcase:|   Architecture:  Unknown 
   Os:  Unknown   |  
--+-
Changes (by simonmar):

  * status:  closed => reopened
  * resolution:  invalid =>

Comment:

 We think it's necessary to compile the definition of sum itself with -O2
 in order to reproduce this.

-- 
Ticket URL: 
GHC 
The Glasgow Haskell Compiler___
Glasgow-haskell-bugs mailing list
Glasgow-haskell-bugs@haskell.org
http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs

Re: [GHC] #2462: Data.List.sum is slower than 6.8.3

[GHC]

#2462: Data.List.sum is slower than 6.8.3
--+-
 Reporter:  simonmar  |  Owner:  simonpj
 Type:  run-time performance bug  | Status:  closed 
 Priority:  high  |  Milestone:  6.10.1 
Component:  Compiler  |Version:  6.8.3  
 Severity:  normal| Resolution:  invalid
 Keywords:| Difficulty:  Unknown
 Testcase:|   Architecture:  Unknown
   Os:  Unknown   |  
--+-
Changes (by simonpj):

  * status:  new => closed
  * resolution:  => invalid

Comment:

 I can't reproduce this.  I compiled
 {{{
 module Main( main ) where
 main = print (sum [1..1::Int])
 }}}
 with -O and -O2 with the HEAD and 6.8.3.  Results are essentially
 identical.

 I'll close this, but if anyone else can reproduce it, please re-open.
 {{{
Allocs   Runtime(user)
 ghc-HEAD-O 8.031M   1.82s
 ghc-HEAD-O28.031M   1.82s
 ghc-6.8.3   -O 8.031M   1.82s
 ghc-6.8.3   -O28.031M   1.82
 }}}
 Simon

-- 
Ticket URL: 
GHC 
The Glasgow Haskell Compiler___
Glasgow-haskell-bugs mailing list
Glasgow-haskell-bugs@haskell.org
http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs

Re: [GHC] #2462: Data.List.sum is slower than 6.8.3

[GHC]

#2462: Data.List.sum is slower than 6.8.3
--+-
 Reporter:  simonmar  |  Owner:  simonpj
 Type:  run-time performance bug  | Status:  new
 Priority:  high  |  Milestone:  6.10.1 
Component:  Compiler  |Version:  6.8.3  
 Severity:  normal| Resolution: 
 Keywords:| Difficulty:  Unknown
 Testcase:|   Architecture:  Unknown
   Os:  Unknown   |  
--+-
Changes (by simonpj):

  * owner:  => simonpj

-- 
Ticket URL: 
GHC 
The Glasgow Haskell Compiler___
Glasgow-haskell-bugs mailing list
Glasgow-haskell-bugs@haskell.org
http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs

[GHC] #2462: Data.List.sum is slower than 6.8.3

[GHC]

#2462: Data.List.sum is slower than 6.8.3
-+--
Reporter:  simonmar  |   Owner: 
Type:  run-time performance bug  |  Status:  new
Priority:  high  |   Milestone:  6.10.1 
   Component:  Compiler  | Version:  6.8.3  
Severity:  normal|Keywords: 
  Difficulty:  Unknown   |Testcase: 
Architecture:  Unknown   |  Os:  Unknown
-+--
 {{{
 main = print (sum [1..1::Int])
 }}}

 with 6.8.3:
 {{{
   MUT   time1.76s  (  1.79s elapsed)
 }}}

 with HEAD (22/7/08)

 {{{
   MUT   time1.97s  (  1.99s elapsed)
 }}}

 complete guess: sum has been mis-optimised by SAT?

-- 
Ticket URL: 
GHC 
The Glasgow Haskell Compiler___
Glasgow-haskell-bugs mailing list
Glasgow-haskell-bugs@haskell.org
http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs