RE: optimistic evaluation
| What is the status of Rob Ennals' optimistic evaluation work? I'm told | that it has been removed from GHC. This is extremely depressing to me. More precisely, it never got into GHC. It was always on a heavily-modified branch. Rob's thesis was fantastic work. But although it sounded simple to start with, when he'd worked out all the details it was very, very complicated. Read his thesis! Simon and I decided that it was too big a complication to drag into our main compiler, and then maintain in perpetuity. It would not be so bad if it was a somewhat orthogonal feature, but it wasn't -- it percolated into many bits of the compiler and runtime system. It was cool stuff. Maybe bright person can figure out an easier way to do it. But I'm afraid we have no plans to incorporate it at the moment. Having said that, it wasn't a silver bullet! I very much doubt that it makes the difference between Haskell being usable for your work in machine learning, and not being usable. You may well need control over space, which is undoubtedly Haskell's weak spot. But remember, lazy evaluation can *reduce* space usage as well as increase it --- and the profiling tools plus seq and (perhaps!) bang patterns may give you the control you need. Simon ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Re[2]: Passing a matrix from C to Haskell
Hello Chris, Wednesday, February 08, 2006, 2:35:39 AM, you wrote: CK You probably want Foreign.Marshal.Array CK http://www.haskell.org/ghc/docs/6.4.1/html/libraries/base/Foreign-Marshal-Array.html CK peekArray :: Storable a = Int - Ptr a - IO [a] i think we should define secret door to construct StorableArray from a pointer to allow to use full power of MArray interface on foreign arrays -- Best regards, Bulatmailto:[EMAIL PROTECTED] ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Re: bug in compacting GC
Bulat Ziganshin wrote: Hello Simon, Monday, February 06, 2006, 5:20:17 PM, you wrote: SM I think this may be a different bug - I can reproduce it, but not with SM the current STABLE branch. It is probably the freeze/thaw bug that was SM fixed after 6.4.1. SM However, I've still seen strange crashes in STABLE when using +RTS -c. SM We build stage 3 of the nightly build with +RTS -c every night, and SM right now we aren't getting any crashes, but a few weeks ago we were. SM When I looked into it, I couldn't get a deterministically repeatable SM crash - every tiny change made the crash go away. i think that my problems is because of this bug, if it is far more frequent. at least i will be glad if ghc and my program will be no more crashed. one problem why i postpone downloading of current stable compiler is the http://hackage.haskell.org/trac/ghc/ticket/637 bug. I suggest you just download STABLE and try to use it. The bug occurs much less frequently with the latest STABLE. If you can reproduce it, we really need to know about it. can you please try to fix it? I'm doing my best :-/ Cheers, Simon ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Re: UTF-8 decoding error
Simon Marlow wrote: Christian Maeder wrote: I'm tempted to replace ä bei \228 in literals. What does haddock do with utf-8 in comments? Will DrIFT -- using read- and writeFile -- still work correctly? The problem I fear is that writeFile does not produce a utf-8 encoded file: writeFile t.hs main = putStrLn \äöüßÄÖÜ\ Using \228\246\252\223\196\214\220 instead of äöüßÄÖÜ only avoids conversion to utf-8 of the initial file l1.hs (attached), but the generated file t.hs is a latin-1 file in both cases. Cheers Christian *Main :l l1.hs Compiling Main ( l1.hs, interpreted ) Ok, modules loaded: Main. *Main main *Main :l t.hs Compiling Main ( t.hs, interpreted ) Ok, modules loaded: Main. *Main main äöüßÄÖÜ main = writeFile t.hs main = putStrLn \äöüßÄÖÜ\ ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Re: [GHC] #683: RULES for recursive functions don't work properly
Bulat Ziganshin wrote: Hello GHC, Tuesday, February 07, 2006, 8:03:49 PM, you wrote: G someone mentioned to me that this expression: GmapM_ action [n..m] G isn't being optimised properly, so I thought I'd look into it. Sure may be, what's me :) i use specially written function as faster version of this idiom and suggested Simon Marlow to substitute mapM [n..m] with call to my function using RULE mechanism The point is that it should already be optimised - both mapM_ and [n..m] work with foldr/build optimisation, but due to the problem reported in that ticket, foldr/build isn't working fully on this example. Better to fix the cause of the problem than work around it with a special RULE. Cheers, Simon ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Re: Passing a matrix from C to Haskell
Bulat Ziganshin wrote: Hello Chris, Wednesday, February 08, 2006, 2:35:39 AM, you wrote: CK You probably want Foreign.Marshal.Array CK http://www.haskell.org/ghc/docs/6.4.1/html/libraries/base/Foreign-Marshal-Array.html CK peekArray :: Storable a = Int - Ptr a - IO [a] i think we should define secret door to construct StorableArray from a pointer to allow to use full power of MArray interface on foreign arrays You mean this? -- |Construct a 'StorableArray' from an arbitrary 'ForeignPtr'. It is -- the caller's responsibility to ensure that the 'ForeignPtr' points to -- an area of memory sufficient for the specified bounds. unsafeForeignPtrToStorableArray :: ForeignPtr e - (i,i) - IO (StorableArray i e) Cheers, Simon ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Re[2]: [GHC] #683: RULES for recursive functions don't work properly
Hello Simon, Wednesday, February 08, 2006, 2:19:07 PM, you wrote: G someone mentioned to me that this expression: GmapM_ action [n..m] G isn't being optimised properly, so I thought I'd look into it. Sure may be, what's me :) i use specially written function as faster version of this idiom and suggested Simon Marlow to substitute mapM [n..m] with call to my function using RULE mechanism SM The point is that it should already be optimised - both mapM_ and [n..m] SM work with foldr/build optimisation, but due to the problem reported in SM that ticket, foldr/build isn't working fully on this example. Better to SM fix the cause of the problem than work around it with a special RULE. i understood this and therefore don't wrote my function body. but now i write it: -- Faster equivalent of mapM_ action [from..to] loop from to action = go from where go i | ito = return () | otherwise = do action i go $! (i+1) for the following purpose - can you check that 'loop' in no more faster equivalent, i.e. that the speed is really the same now? -- Best regards, Bulatmailto:[EMAIL PROTECTED] ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Re: Passing a matrix from C to Haskell
Simon Marlow wrote: Bulat Ziganshin wrote: [...] i think we should define secret door to construct StorableArray from a pointer to allow to use full power of MArray interface on foreign arrays You mean this? -- |Construct a 'StorableArray' from an arbitrary 'ForeignPtr'. It is -- the caller's responsibility to ensure that the 'ForeignPtr' points to -- an area of memory sufficient for the specified bounds. unsafeForeignPtrToStorableArray :: ForeignPtr e - (i,i) - IO (StorableArray i e) It looks like this function is not available in GHC 6.4.1 (see http://www.haskell.org/ghc/docs/6.4.1/html/libraries/base/Data-Array-Storable.html ) It is, however, documented at http://www.haskell.org/HOpenGL/newAPI/base/Foreign-Storable.html but I don't know which version of GHC it applies to. Cheers, Cyril ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Re: Passing a matrix from C to Haskell
Chris Kuklewicz wrote: Cyril Schmidt wrote: I need to pass a big 2-dimensional array of doubles from a legacy C code to a Haskell module. Of this huge array, the Haskell code will actually use only a few elements (say, 10 out of 100x20 matrix). Unfortunately, the C code does not know which data are actually needed in the Haskell module. You probably want Foreign.Marshal.Array http://www.haskell.org/ghc/docs/6.4.1/html/libraries/base/Foreign-Marshal-Array.html peekArray :: Storable a = Int - Ptr a - IO [a] This works, but peekArray is very slow. Cheers Cyril ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Re: Passing a matrix from C to Haskell
It is, however, documented at http://www.haskell.org/HOpenGL/newAPI/base/Foreign-Storable.html but I don't know which version of GHC it applies to. Sorry, I meant at http://www.haskell.org/HOpenGL/newAPI/base/Data-Array-Storable.html Cyril ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Re: Passing a matrix from C to Haskell
Cyril Schmidt wrote: Simon Marlow wrote: Bulat Ziganshin wrote: [...] i think we should define secret door to construct StorableArray from a pointer to allow to use full power of MArray interface on foreign arrays You mean this? -- |Construct a 'StorableArray' from an arbitrary 'ForeignPtr'. It is -- the caller's responsibility to ensure that the 'ForeignPtr' points to -- an area of memory sufficient for the specified bounds. unsafeForeignPtrToStorableArray :: ForeignPtr e - (i,i) - IO (StorableArray i e) It looks like this function is not available in GHC 6.4.1 (see http://www.haskell.org/ghc/docs/6.4.1/html/libraries/base/Data-Array-Storable.html ) It is, however, documented at http://www.haskell.org/HOpenGL/newAPI/base/Foreign-Storable.html but I don't know which version of GHC it applies to. Yes, it's new since 6.4.x. It will be in 6.6. Cheers, Simon ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Fwd: patch applied (ghc): make the smp way RTS-only, normal libraries now work with -smp
i think that this should be interesting for GHC users This is a forwarded message From: Simon Marlow [EMAIL PROTECTED] To: [EMAIL PROTECTED] Date: Wednesday, February 08, 2006, 5:40:19 PM Subject: patch applied (ghc): make the smp way RTS-only, normal libraries now work with -smp ===8==Original message text=== Wed Feb 8 06:33:48 PST 2006 Simon Marlow [EMAIL PROTECTED] * make the smp way RTS-only, normal libraries now work with -smp We had to bite the bullet here and add an extra word to every thunk, to enable running ordinary libraries on SMP. Otherwise, we would have needed to ship an extra set of libraries with GHC 6.6 in addition to the two sets we already ship (normal + profiled), and all Cabal packages would have to be compiled for SMP too. We decided it best just to take the hit now, making SMP easily accessible to everyone in GHC 6.6. Incedentally, although this increases allocation by around 12% on average, the performance hit is around 5%, and much less if your inner loop doesn't use any laziness. M ./ghc/compiler/codeGen/CgForeignCall.hs -6 +5 M ./ghc/compiler/codeGen/CgHeapery.lhs -3 +1 M ./ghc/compiler/codeGen/CgPrimOp.hs -4 +1 M ./ghc/compiler/codeGen/ClosureInfo.lhs -24 +15 M ./ghc/compiler/codeGen/SMRep.lhs -3 +2 M ./ghc/compiler/ghci/ByteCodeAsm.lhs +2 M ./ghc/compiler/ghci/ByteCodeGen.lhs -11 +13 M ./ghc/compiler/ghci/ByteCodeInstr.lhs -1 +3 M ./ghc/compiler/ghci/ByteCodeItbls.lhs -3 +3 M ./ghc/compiler/main/Constants.lhs -2 +1 M ./ghc/compiler/main/StaticFlags.hs -7 +4 M ./ghc/includes/Bytecodes.h -22 +23 M ./ghc/includes/Closures.h -11 +10 M ./ghc/includes/Cmm.h -4 M ./ghc/includes/Constants.h -21 +4 M ./ghc/includes/Storage.h -2 +67 M ./ghc/includes/mkDerivedConstants.c -39 +6 M ./ghc/rts/Apply.cmm -1 +1 M ./ghc/rts/GC.c -6 +6 M ./ghc/rts/GCCompact.c -55 +1 M ./ghc/rts/Interpreter.c -21 +30 M ./ghc/rts/LdvProfile.c -89 +19 M ./ghc/rts/LdvProfile.h -1 +1 M ./ghc/rts/Linker.c +2 M ./ghc/rts/ProfHeap.c -3 +3 M ./ghc/rts/RetainerProfile.c -93 +1 M ./ghc/rts/Sanity.c -7 +7 M ./ghc/rts/Schedule.c -3 +3 M ./ghc/rts/Sparks.c +10 M ./ghc/rts/Sparks.h -1 +4 M ./ghc/rts/Updates.h -18 +25 M ./mk/config.mk.in -6 +8 ___ Cvs-ghc mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/cvs-ghc ===8===End of original message text=== -- Best regards, Bulatmailto:[EMAIL PROTECTED] ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Re[2]: Passing a matrix from C to Haskell
Hello Cyril, Wednesday, February 08, 2006, 7:39:51 PM, you wrote: peekArray :: Storable a = Int - Ptr a - IO [a] CS This works, but peekArray is very slow. use the attached module. this will allow you to use usafeRead/unsafeWrite i written it while i'm online so it can contain any mumber of bugs ;) ps: btw, if you know russian - i know it too ;) -- Best regards, Bulatmailto:[EMAIL PROTECTED] ForeignArray.hs Description: Binary data ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Re: Passing a matrix from C to Haskell
Cyril Schmidt wrote: I was thinking of something like passing the array as Ptr Int#, but how do I fetch the elements that I am interested in? I think you want Ptr CInt and peekElemOff. If the array is declared in C as int a[100][20] and p :: Ptr CInt is a Haskell pointer to it, then a[y][x] can be accessed as peekElemOff p (y * 20 + x). This should be 100% portable. -- Ben ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
forall a (Ord a = a- a) - Int is an illegal type???
Hi - I've been puzzling over section 7.4.9.3 of the ghc users manual for the past few months (!) and still can't understand why the following is an illegal type: forall a. ((Ord a = a- a) - Int) whereas (forall a. Ord a = a-a) - Int is legal. I can understand why the second one *is* legal but I can't seem to understand why the first syntax is not just exactly the same thing even though the parse tree is different. Can anyone shed some light on this? Thanks, Brian. ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Re: forall a (Ord a = a- a) - Int is an illegal type???
Brian Hulley wrote: Hi - I've been puzzling over section 7.4.9.3 of the ghc users manual for the past few months (!) and still can't understand why the following is an illegal type: forall a. ((Ord a = a- a) - Int) whereas (forall a. Ord a = a-a) - Int is legal. I can understand why the second one *is* legal but I can't seem to understand why the first syntax is not just exactly the same thing even though the parse tree is different. Can anyone shed some light on this? Thanks, Brian. A better way of putting the question is that I can't see the difference between: forall a. ((Ord a = a-a) - Int) and forall a. Ord a = (a-a) - Int ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Re[2]: forall a (Ord a = a- a) - Int is an illegal type???
Hello Brian, Thursday, February 09, 2006, 9:38:35 AM, you wrote: the past few months (!) and still can't understand why the following is an illegal type: forall a. ((Ord a = a- a) - Int) i don't know right answer burt may be because Ord a restriction and forall a )dseclaration of type variable) should be at the same level. imagine the following declaration: forall a. (Int - (Ord a = a)) - Int) it is not good to write restriction on some deep level instead of right together with declaration -- Best regards, Bulatmailto:[EMAIL PROTECTED] ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
