- Glasgow-haskell-users

RE: problems with the ffi
by Simon Marlow 11 Nov '02

11 Nov '02

> I am having problems with the ghc ffi, I have compiled the > Haskell source on the ffi example page to create the stub > file and the c file, the only problem now is that I can't > compile the sample c code. I assume that if you place the c > code and all the files in the ghc include directory that it > should compile. However I am getting errors, to begin I get > something like can't find stint.h when it is definitely > present. Then I get errors with the special Haskell ffi > procedures i.e. startupHaskell(argc, argv, __stginit_Foo). > The compiler says that this is an unresolved external symbol. > > I am attempting this on windows xp using visual c++ 5. Any > help would be greatly appreciated. It would help if you could post the exact procedure you're using, and the error messages you get (just cut 'n' paste it). Cheers, Simon

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problems with the ffi
by David Abbs 10 Nov '02

10 Nov '02

I am having problems with the ghc ffi, I have compiled the Haskell source on the ffi example page to create the stub file and the c file, the only problem now is that I can't compile the sample c code. I assume that if you place the c code and all the files in the ghc include directory that it should compile. However I am getting errors, to begin I get something like can't find stint.h when it is definitely present. Then I get errors with the special Haskell ffi procedures i.e. startupHaskell(argc, argv, __stginit_Foo). The compiler says that this is an unresolved external symbol. I am attempting this on windows xp using visual c++ 5. Any help would be greatly appreciated. ____________________________________________________ David Abbs 3rd Year Computer Science University Of Sheffield u0da2(a)dcs.shef.ac.uk ____________________________________________________

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Newslwtter
by Marta 10 Nov '02

10 Nov '02

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RE: profiling mutator time per function vs. GC time
by Simon Marlow 08 Nov '02

08 Nov '02

> It seems I have two options: > > A) compile without profiling support and run the compiled > program with +RTS -sstderr > > B) compile with profiling support -prof -auto-all and run > the compiled program with +RTS -p -sstderr > > In case A, I get a good measure of GC vs. mutator time, but I > don't know > the amount of time used by single functions, so I can't > seperate between > mutator time spent in the functions that really interest me > and the time > spent for the test frame. > > In case B, I can seperate mutator time spent in single > functions, but I > have the impression that the GC time I then get includes the > GC for the > profiler, and hence is useless for me, because different GC times for > different algorithms might just mean that one of the > algorithms requires more profiling overhead. If you run a profiled program with +RTS -sstderr, the time breakdown includes an extra category, PROF, which counts the time spent in the heap profiler. The amount of GC time consumed by the profiled program will indeed be different from the unprofiled program, because of profiling overheads - there's no way around this, I'm afraid. But you may find that the ratio of mutator to GC time in the profiled program is similar to the unprofiled program (I'd be interested to know whether this is/is not the case). To get the most reliable measure of GC time in a profiled program, do not turn on heap profiling, because this will cause extra GCs to be performed and will inflate the GC time. Turing on time profiling should be ok. Cheers, Simon

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RE: GHCi on Mac OS X
by Simon Marlow 08 Nov '02

08 Nov '02

> When I start the ghci with -package data, I get the following output: > > Loading package base ... linking ... done. > Loading package haskell98 ... linking ... done. > Loading package lang ... linking ... done. > Loading package concurrent ... linking ... done. > Loading package posix ... linking ... done. > Loading package util ... linking ... not found: _rl_funmap_names > Abort > > I know that I must install the readline library seperately; > can anybody tell me how to do this? It may be that you have the wrong version of the readline library installed. We're chasing a similar problem on SuSE Linux, but I haven't managed to trace the cause yet. Sorry I can't be any more help... Wolfgang - any ideas? Cheers, Simon

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RE: Nightly build snapshots available
by Simon Marlow 08 Nov '02

08 Nov '02

> At 2002-11-07 06:10, Ralf Hinze wrote: > > >I would appreciate a little note saying "this snapshot is ok", > >or "this one is horribly broken", or maybe "this one is a milestone", > >if this is at all possible. > > Heh, I suspect that's for us to find out... Well, most of the time you know as much as me :-) I don't want to tag each snapshot with a personal certification of stability because (a) most of the time I have no idea, (b) it's extra work (I went to a lot of trouble to automate all this), (c) there are likely to be cases exercised by your code but not by any of our tests, and (d) the nightly build logs contain a nice testing report stating which tests failed for each snapshot. Currently, for example, we're running at about 7 test case failures out of 3000-ish, and these failures are mostly harmless (floating-point differences when programs are compiled with the native code generator). The compiler is relatively stable at the moment, but your mileage may vary... (PS sorry about the lack of a source dist from last night's build again, hopefully it'll appear tonight). Cheers, Simon

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RE: crash in profiling mode
by Simon Marlow 08 Nov '02

08 Nov '02

> Another question: The profiling mode of GHC-4.08.2 did also output (in > mode +RTS -p) the time spent on garbage collection (as an additional > percentage of overall running time). > With the programs I tested so far under GHC-5.04.1, I never > saw such an > indication in a.out.prof, although for the same programs under > GHC-4.08.2 considerable garbage collection times were measured. > > Does this mean that: > > a) the indication of garbage collection times has been dropped from > profiling reports (can I obtain them in another way?), > > or > > b) the newer GHC is so smart that it optimised away the need for > garbage collection in the particular (few) programs I tested, but > otherwise the GC times will show up in profiling reports, > > or > > c) something else? The inclusion of GC time in the report was wrong, since GC time wasn't included in the figure for total time, so you could get GC times of > 100%. You can get a measure of GC time vs. mutator time by adding '+RTS -sstderr' to the command line. Cheers, Simon

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Re: Nightly build snapshots available
by Ashley Yakeley 08 Nov '02

08 Nov '02

At 2002-11-07 06:10, Ralf Hinze wrote: >I would appreciate a little note saying "this snapshot is ok", >or "this one is horribly broken", or maybe "this one is a milestone", >if this is at all possible. Heh, I suspect that's for us to find out... -- Ashley Yakeley, Seattle WA

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Re : Extensible records in Haskell
by Nicolas Oury 07 Nov '02

07 Nov '02

> > Hello, is there something like extensible records in ghc? >Are you wanting something like Hugs' T-Rex or did you have something >else in mind? Hello, For what I understand of T-Rex it is what I wait. I need something that can allow to use records without declaring their type first and that can be extended by creating a new records with the same contents plus one or less one. Best regards, Nicolas

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GHCi on Mac OS X
by Felix Reckers 07 Nov '02

07 Nov '02

When I start the ghci with -package data, I get the following output: Loading package base ... linking ... done. Loading package haskell98 ... linking ... done. Loading package lang ... linking ... done. Loading package concurrent ... linking ... done. Loading package posix ... linking ... done. Loading package util ... linking ... not found: _rl_funmap_names Abort I know that I must install the readline library seperately; can anybody tell me how to do this? Felix Reckers

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