- Glasgow-haskell-users

RE: fast IO in ghc
by Simon Peyton-Jones 03 Apr '02

03 Apr '02

And, with a lot of help from Koen, I'm about to fold in a much more efficient implementation of Read, which may help. Simon | -----Original Message----- | From: Hal Daume III [mailto:hdaume@ISI.EDU] | Sent: 03 April 2002 05:36 | To: GHC Users Mailing List | Subject: fast IO in ghc | | | I tend to deal a lot with very very large data files in | Haskell and my current approach to dealing with getting data | out of one program an into another is writing it to a file | using 'show' and then reading it in using 'read'. | Unfortunately, this is very slow and produces very large | files which are very slow to read and write. Is there | another option? I don't care about H98 compatibility, so if | there's a way to somehow just dump ghc's internal | representation (I also don't care about x-platformness) to a | file and read it back, that would be excellent. Other | suggestions are welcome too :). | | -- | Hal Daume III | | "Computer science is no more about computers | hdaume(a)isi.edu | than astronomy is about telescopes." -Dijkstra | www.isi.edu/~hdaume | | _______________________________________________ | Glasgow-haskell-users mailing list | Glasgow-haskell-users(a)haskell.org | http://www.haskell.org/mailman/listinfo/glasgow-| haskell-users |

1 0

RE: fast IO in ghc
by Simon Marlow 03 Apr '02

03 Apr '02

> I tend to deal a lot with very very large data files in Haskell and my > current approach to dealing with getting data out of one > program an into > another is writing it to a file using 'show' and then reading > it in using > 'read'. Unfortunately, this is very slow and produces very > large files > which are very slow to read and write. Is there another > option? I don't > care about H98 compatibility, so if there's a way to somehow just dump > ghc's internal representation (I also don't care about > x-platformness) to > a file and read it back, that would be excellent. Other > suggestions are > welcome too :). I wrote a binary I/O library recently for GHC, which we're using to speed up interface file reading and writing. The library is similar to nhc98's Binary library, execept that it works in terms of bytes rather than bits, and we don't do lazy binary I/O in the same way. It currently has some GHC-specific stuff in it, but I plan to make a generic version for the libraries at some point. For the time being, you can pull it out of CVS and take a look - it's in ghc/utils/Binary.hs. It should work if you remove the GHC-specific bits. Cheers, Simon

1 0

Haskell/Erlang Research Position
by Phil Trinder 03 Apr '02

03 Apr '02

Research Associate in Haskell/Erlang for Distributed Telecommunications �17,278-�26,229 p.a. Applications are invited for a three year Research Associate position at Heriot-Watt University to work with Dr Phil Trinder on an EPSRC funded project entitled "High-Level Techniques for Distributed Telecommunications Software". The project is a collaboration with Motorola UK Research Labs and aims to evaluate high-level distributed programming techniques for constructing realistic telecommunications software. Applications are welcomed from candidates with a doctorate or a very good first degree in Computing or cognate discipline; a successful candidate without a PhD will have the opportunity of registering for one. Applicants should have good written and verbal communication skills and be able to demonstrate a strong programming ability: experience with distribution and the Haskell or Erlang programming languages is desirable. Likewise a research background, and familiarity with the telecommunications sector are desirable. For application details please contact the Personnel Office, Heriot-Watt University, Edinburgh, EH14 4AS, tel/fax: 0131 451 3475 (24 hours) quoting Ref 66/02/J. The closing date is Friday 19th April 2002. Informal enquires can be directed to Phil Trinder tel: +44 131 451 3435, or e-mail: trinder(a)cee.hw.ac.uk. More details of the project and further particulars for the position can be found at: http://www.cee.hw.ac.uk/~dsg/telecoms/

1 0

-pgmc flag in 5.02.2
by Ashley Yakeley 03 Apr '02

03 Apr '02

I notice -pgmc prog doesn't work in GHC 5.02.2 (works OK in 5.03). Do I want to do -pgmc=prog for the -pgm flags? And if so, will that also work in 5.03 and later versions? -- Ashley Yakeley, Seattle WA

2 1

GHC/MacOS X 'foreign export dynamic'
by Ashley Yakeley 03 Apr '02

03 Apr '02

At 2002-03-22 15:52, Wolfgang Thaller wrote: >A tar.gz file (14.5MB) of GHC for MacOS X is now available for download at: >http://www.foldr.org/Software/Haskell/ghc/ghc-5.03-13032002-MacOSX.tar.gz I think there's a bug in the support for 'foreign export dynamic'. The enclosed code crashes intermittently. Sometimes it does this: $ ./FEDBug Haskell: making callback Haskell: calling callback native: calling callback Haskell: haskellFunction native: done calling callback Haskell: done And sometimes it does this: $ ./FEDBug Haskell: making callback Haskell: calling callback native: calling callback Illegal instruction It's about 50/50 on my MacOS X machine. The same code never crashes on my Linux/i386 box. -- Ashley Yakeley, Seattle WA

1 0

JVM-Bridge Current Status
by Ashley Yakeley 03 Apr '02

03 Apr '02

1. Changes So Far The following changes have been checked into CVS since the 0.1 release: Native/ * MacOS X support * Beginnings of mingw32 support * New Sun 1.4 JVM * Now installs in /usr/lib/jvm-bridge/ * ExecuteFunction bindings now done at run-time Haskell/ * MacOS X support * 'Haskell' now a separate Autotools project installing in /usr/lib/jvm-bridge/ * New array region access functions * Correct array types in autogenerated class interfaces * Subtype parameters in autogenerated class interfaces * VMLayer 'env' parameter now implicit * Various changes in the BasicLayer * new native StartExecuteFunction function called by getExecuteFunctionClass, defineCallbackClass I recommend using GHC 5.02.2 or later. Possibly it might work with 5.02. 2. Current Work MacOS X callback support is buggy, and I'm currently working on it. It might a problem with ghc-5.03-13032002-MacOSX (foreign export dynamic), or it might be a bug in JVM-Bridge. Thomas Pasch <extern.thomas.pasch(a)volkswagen.de> has done some work on getting JVM-Bridge to compile under mingw32. I have integrated some of his patches. I do not have a Windows machine myself. I would like to do a 0.2 release, say when both examples work on all three platforms. 3. I have created a new mailing list: <http://lists.sourceforge.net/lists/listinfo/jvm-bridge-devel> If you are using JVM-Bridge I encourage you to subscribe. -- Ashley Yakeley, Seattle WA

1 0

cygwin32 snapshot available
by Sigbjorn Finne 27 Mar '02

27 Mar '02

Hi, for people wanting to use GHC to compile cygwin applications on Win32, I've made available a binary snapshot of current CVS sources, http://galois.com/~sof/ghc-5.03-20020326-cygwin32.tar.gz It is a bare-bones snapshot (no profiling libs, no interpreter, no docs) & is intended for 'enthusiasts' only. The main purpose for putting it together was to help out anyone wanting to build cygwin versions of the GHC sources, something that's tricky to do using the released versions of GHC. hth --sigbjorn

1 0

Re: GHC for MacOS X binary now available
by Ashley Yakeley 27 Mar '02

27 Mar '02

At 2002-03-22 15:52, Wolfgang Thaller wrote: >A tar.gz file (14.5MB) of GHC for MacOS X is now available for download at: >http://www.foldr.org/Software/Haskell/ghc/ghc-5.03-13032002-MacOSX.tar.gz Do you have 'gcc' installed on your system? It's not there by default on OS X, but your GHC seems to want it. My workaround is to pass these to GHC: -pgmc cc -pgma cc -pgml cc (actually I use $(CC) instead of cc in my Makefile). Consider using 'cc' instead of 'gcc' for default programs. -- Ashley Yakeley, Seattle WA

2 1

Re: GHC for MacOS X binary - ranlib and libgmp
by Ashley Yakeley 27 Mar '02

27 Mar '02

At 2002-03-27 01:26, Wolfgang Thaller wrote: >... and that's probably why libgmp was already installed on my >system, and I never even thought about it. For now, you'll have to >get it from "someplace else"... OK, I'll use the one in the 5.00.2 port. I'm currently attempting to build JVM-Bridge, which uses createAdjustor. I'll let you know how it works out... -- Ashley Yakeley, Seattle WA

1 0

Re: GHC for MacOS X binary now available
by Ashley Yakeley 27 Mar '02

27 Mar '02

At 2002-03-22 15:52, Wolfgang Thaller wrote: >A tar.gz file (14.5MB) of GHC for MacOS X is now available for download at: >http://www.foldr.org/Software/Haskell/ghc/ghc-5.03-13032002-MacOSX.tar.gz You need to run ranlib on a bunch of the libHS*.a files. Also, linking with ghc seems to need libgmp: /usr/bin/ld: table of contents for archive: /usr/local/lib/ghc-5.03/libHSconcurrent.a is out of date; rerun ranlib(1) (can't load from it) /usr/bin/ld: table of contents for archive: /usr/local/lib/ghc-5.03/libHSlang.a is out of date; rerun ranlib(1) (can't load from it) /usr/bin/ld: table of contents for archive: /usr/local/lib/ghc-5.03/libHSlang_cbits.a is out of date; rerun ranlib(1) (can't load from it) /usr/bin/ld: table of contents for archive: /usr/local/lib/ghc-5.03/libHShaskell98.a is out of date; rerun ranlib(1) (can't load from it) /usr/bin/ld: table of contents for archive: /usr/local/lib/ghc-5.03/libHSbase.a is out of date; rerun ranlib(1) (can't load from it) /usr/bin/ld: table of contents for archive: /usr/local/lib/ghc-5.03/libHSbase_cbits.a is out of date; rerun ranlib(1) (can't load from it) /usr/bin/ld: table of contents for archive: /usr/local/lib/ghc-5.03/libHSrts.a is out of date; rerun ranlib(1) (can't load from it) /usr/bin/ld: can't locate file for: -lgmp Doing ranlib was easy, but I'm not sure about -lgmp. Was there supposed to be a libgmp.a included? I notice other ghc versions for MacOS X include a libgmp.a. -- Ashley Yakeley, Seattle WA

2 1