April 2010 - Haskell-Cafe

Profiling
by Andrew Coppin 03 Apr '10

03 Apr '10

Two small questions: 1. Is Thread Scope any use for profiling single-threaded programs? 2. I tried to compile my program with -prof, but GHC just whines at me that the packages I'm using haven't been compiled for profiling. Do I really need to go recompile every single package I'm using with profiling support before I can profile my program? How do I tell Cabal to install the necessary code? (I really hope this doesn't involve uninstalling and reinstalling everything...)

3 2

Different behavior of GHC 6.10.1 and Hugs (Sep 2006)
by Vladimir Reshetnikov 03 Apr '10

03 Apr '10

Hi list, GHC 6.10.1: Prelude> :t let f x y = return x == return y in f let f x y = return x == return y in f :: (Eq (m a), Monad m) => a -> a -> Bool Hugs (Sep 2006): Hugs> :t let f x y = return x == return y in f ERROR - Ambiguous type signature in inferred type *** ambiguous type : (Eq (a b), Monad a) => b -> b -> Bool *** assigned to : f Who is right? -- Thanks Vladimir

2 1

Haskellers hate GUIs!!
by Jürgen Nicklisch-Franken 03 Apr '10

03 Apr '10

I am in the damned position to have tried to develop a GUI app in Haskell. I'm building on top of gtk2hs, now we have a new compiler version a new Platform release and no gtk2hs release, so I cite from a mail from a potential user/contributor for my GUI app. What shall I say, how should he install gtk2hs? Is their a way to get a stable version from a changing darcs repo? If not all Haskellers were such GUI haters, we would have GUI libs with the platform. Jürgen " ... Each gtk2hs package (like glib-0.10.1) installed in that non-standard location by Ubuntu apt-get does at least have a package.conf file, like glib.package.conf. However, on inspection, the "id" fields are missing, and the "depends" fields look more like .cabal file "depends" fields (no ABI ID). I tried an experiment on my glib.package.conf, used "ghc --abi-hash" to generate an ID, so eventually creating a new line something like id: glib-0.10.1-d41d8cd98f00b204e9800998ecf8427e and then set up the "depends" properly by getting the real dependencies using "ghc-pkg -v list". After doing this then ghc-pkg register glib.package.conf worked just fine, and I see it in my global DB. It's cool that this works but it seems highly roundabout. :-) Building gtk2hs from source is broken. Not sure why - I did it OK with ghc-6.10.3. I can run ./configure no problem with ./configure --with-hcflags=-O0 --disable-split-objs --with-ghc=/usr/local/lib/ghc-6.12.1 and it claims that it will build: * The following packages will be built: * * glib : yes * gtk : yes * gio : yes * glade : yes * cairo : yes * svgcairo : yes * gtkglext : no * gconf : yes * sourceview : no * gtksourceview2 : yes * mozembed : no * soegtk : yes * gnomevfs : no * gstreamer : yes * documentation : no But "make" fails horribly...can't find any packages like "base" that configure had no problems finding, so I have no idea what the problem is there. Which is why I'd rather figure out a way to make ghc-6.12.1 recognize the gtk2hs packages that I have in that non-standard location. It works but it's awkward. :-) Each gtk2hs package (like glib-0.10.1) installed in that non-standard location by Ubuntu apt-get does at least have a package.conf file, like glib.package.conf. However, on inspection, the "id" fields are missing, and the "depends" fields look more like .cabal file "depends" fields (no ABI ID). I tried an experiment on my glib.package.conf, used "ghc --abi-hash" to generate an ID, so eventually creating a new line something like id: glib-0.10.1-d41d8cd98f00b204e9800998ecf8427e and then set up the "depends" properly by getting the real dependencies using "ghc-pkg -v list". After doing this then ghc-pkg register glib.package.conf worked just fine, and I see it in my global DB. It's cool that this works but it seems highly roundabout. :-) I think I'll pack it in for the evening. The procedure I described works well in theory, but apparently if the "depends" field in the "package conf" files says something like foo-2.0.1.0, it's not OK to use an existing registered "foo" that has a higher version number...I registered everything in gtk2hs manually but when building ltk it complains with Bad interface file: /usr/lib/haskell-packages/ghc6/lib/gtk-0.10.1/imports/Graphics/UI/Gtk.hi mismatched interface file versions (wanted "6121", got "") Unfortunately when using these package configuration files one has to use the ABI ID - "ghc-pkg register" won't work otherwise - so it's very finicky. I'll have to un-register all my gtk2hs packages, and start again from scratch. Anyway, back to Ubuntu, Haskell and Leksah. :-) I am removing vestiges of ghc-6.10.3 off my Ubuntu system as I encounter them, although I have no reason to believe that the presence of directories and files for that old version are causing me any harm. I am keeping ghc-6.10.4 around, in parallel with ghc-6.12.1. In any case, to the degree that I have exercised it, ghc-6.12.1 is apparently OK. I have done some "cabal install"s on a few executables and libraries, both into user and global, and things seem OK as evidenced by "ghc-pkg list". Now, to gtk2hs and ltk and Leksah. After having initial problems with building gtk2hs from source, for reasons I don't want to spend time investigating (yet), I am returning to the apt package approach, command-line this time instead of through the Synaptic GUI. Running sudo apt-get install libghc6-gtk-dev partially returns --------------- Selecting previously deselected package libghc6-glib-dev. (Reading database ... 257458 files and directories currently installed.) Unpacking libghc6-glib-dev (from .../libghc6-glib-dev_0.10.1-1ubuntu2_i386.deb) ... Selecting previously deselected package libghc6-cairo-dev. Unpacking libghc6-cairo-dev (from .../libghc6-cairo-dev_0.10.1-1ubuntu2_i386.deb) ... Selecting previously deselected package libghc6-gtk-dev. Unpacking libghc6-gtk-dev (from .../libghc6-gtk-dev_0.10.1-1ubuntu2_i386.deb) ... Setting up libghc6-glib-dev (0.10.1-1ubuntu2) ... Reading package info from "/usr/lib/haskell-packages/ghc6/lib/glib-0.10.1/glib.package.conf" ... done. Writing new package config file... done. Setting up libghc6-cairo-dev (0.10.1-1ubuntu2) ... Reading package info from "/usr/lib/haskell-packages/ghc6/lib/cairo-0.10.1/cairo.package.conf" ... done. Writing new package config file... done. Setting up libghc6-gtk-dev (0.10.1-1ubuntu2) ... Reading package info from "/usr/lib/haskell-packages/ghc6/lib/gtk-0.10.1/gtk.package.conf" ... done. Writing new package config file... done. --------------- You'll see the files I was talking about, the *.package.conf files. I've attached the one for cairo, so you can also see what I was talking about: these files are real close to the *.conf files in the user and global package.conf.d databases, but they are missing the "id" field, and the "depends" field entries are like base-4.1.0.0 as opposed to a full base-3.0.3.2-52acef427378232ec569bca0486ee48f In other words, as is, "ghc-pkg register" can't use these files. Which is why I manually edited them. I still see no reason why my manual approach will not work (although figuring out how to build from source would be even better), but I'll have to keep the exact versions specified in these *.package.conf files. Much obliged for the tip about using darcs for the gtk2hs build. Worked like a charm. Combined with that, and doing occasional "cabal install"'s along the way, I have ltk and haddock-leksah-6.12 now built. I don't consider the 5 or 6 hours I spent on all this (which includes building ghc-6.12.1 from source) to be wasted; I learned a lot more about GHC package management. Bit of a snag now with leksah-server (the version in leksah-server.cabal is 0.8.0.5). I've included the console output of the build. Looking at that very first problem: /home/arved/.cabal/lib/ltk-0.8/ghc-6.12.1/libHSltk-0.8.a(Parameters.o): In function `s9Ao_info': (.text+0x28b9): undefined reference to `gtkzm0zi10zi1_GraphicsziUIziGtkziGeneralziEnums_zdfShowShadowType_closure' I can sort of parse this. I see code concerning ShadowType in ltk/Graphics.UI.Editor.Parameters.hs, and I can see that a complaint is being made about something related to ShadowType not being found (I believe) in gtk/Graphics.UI.Gtk.General.Enums. With the {-- #if MIN_VERSION_gtk(0,9,13) -- now defined in gtk #else instance Show ShadowType where show _ = "Any Shadow" #endif --} in Parameters.hs, and seeing as how gtk is 0.10.1, I would expect us to be using gtk code to provide that Show instance for ShadowType, no? Any ideas? ... "

15 21

Software correctness in the auto industry and FPLs
by Vasili I. Galchin 02 Apr '10

02 Apr '10

Sorry for no "Subject" on the first post. In any case, I meant this Wall Street Journal as a challenge to the Haskell community to perhaps "step up to the plate" in the auto arena vis-a-vis software correctness. I realize that with hard real-time problems and a garbage collector that that could be a problem. In any case , enjoy. Vasili On Fri, Apr 2, 2010 at 5:55 AM, Vasili I. Galchin <vigalchin(a)gmail.com> wrote: > * > * > * > * > * > * > * More > o BigCharts > o Virtual Stock Exchange > o FiLife.com > o WSJ Asia > o WSJ Europe > o WSJ Portuguese > o WSJ Spanish > o WSJ Chinese > o WSJ Japanese > o WSJ Radio > o Financial News > > SEARCH > > * Wednesday, March 31, 2010 > Autos > o Welcome, William Halchin Logout > o > + My Account > + My Journal > + Help > + Message Center ( new) > > * > U.S. Edition > > WSJ.com is available in the following editions and languages: > o U.S. > o Asia > + India > + China > + Japan > o Europe > o Americas > + en Español > + em Português > o Login/Register to set your edition > o Set my edition > o Today's Paper > o Video > o Columns > o Blogs > o Topics > o Journal Community > > Register for FREE > Register for FREE > > Thank you for registering. > > We sent an email to: > > Please click on the link inside the email to complete your registration > > Please register to gain free access to WSJ tools. > > An account already exists for the email address entered. > > Forgot your username or password? > > This service is temporary unavailable due to system maintenance. > Please try again later. > > The username entered is already associated with > another account. 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To order presentation-ready copies for > distribution to your colleagues, clients or customers, use the Order > Reprints tool at the bottom of any article or visit www.djreprints.com > See a sample reprint in PDF format. Order a reprint of this article now > * The Wall Street Journal > > * MARCH 31, 2010 > > Now, Even NASA Is Involved in Toyota Crisis > > * Article > * Comments (2) > > more in Auto Industry News » > > * Email > * Print > * > > Save This ↓ More > * > o > > facebook > facebook > o > > Twitter > Twitter > o > > Digg > Digg > o > > StumbleUpon > StumbleUpon > o + More > close > o Yahoo! Buzz > o MySpace > o del.icio.us > o Reddit > o LinkedIn > o Fark > o Viadeo > o Orkut > * larger Text smaller > > By BEN WORTHEN > > U.S. regulators on Tuesday announced a broad investigation into > automotive computer systems and software, which have come under > scrutiny because of sudden acceleration and other reports involving > some Toyota Motor Corp. cars. > > An examination of Toyota's problems will be conducted by experts from > the National Aeronautics and Space Administration, while the National > Academy of Sciences, which advises the government, will undertake a > separate, 15-month study into the use of computer technology in cars, > U.S. Transportation Secretary Ray LaHood said. > > Toyota has said there is no evidence that software or electronic > systems are responsible for sudden acceleration in its cars. The > company "repeatedly and rigorously" tests its software and has > subjected it to outside review, a spokesman said. > > Electronics have led to some of the biggest safety breakthroughs in > vehicles, such as antilock brakes and stability control. Software > controls an ever-growing variety of functions in cars, including > braking and accelerating. Increasingly, cars include software that > links these systems to do things like parallel park the vehicle or > remember the seat positions, temperatures and radio stations preferred > by different drivers. > > "Ninety percent of all innovation in cars today is driven by > software," said Ingolf Krueger, an associate professor of computer > science and engineering at the University of California in San Diego. > > No surprise then that software is sometimes to blame when things go > wrong. While Toyota has received most of the attention, other car > makers have had software-related incidents. > > Ford Motor Co.'s 2010 Fusion Hybrid has a high-tech braking system > that also recharges its battery through a process called regenerative > braking. Software monitors sensors in the car and determines when to > engage the conventional braking system instead. Several drivers filed > complaints with the National Highway Traffic Safety Administration, > the agency responsible for vehicle safety, stating that they depressed > the brake pedal as far as possible but the brakes didn't engage. > > A Ford spokesman said a sensor on the car was set too sensitively and > that software interpreted the signal to mean it should skip the > regenerative braking step. The company issued a software upgrade that > it said would take care of the issue, avoiding a recall. > > In November 2008, General Motors Co. recalled 12,662 of its 2009 model > year Cadillac CTS sedans because a software glitch caused the > passenger-side air bag to be turned off when it should have been > active. > > That same year, Volkswagen AG recalled 4,079 2008 Passats because of > software that didn't properly control the engine idle while the air > conditioning was on. And Toyota in February recalled 2010 Priuses to > fix the software in their antilock brakes that some owners said led to > delays in the brakes engaging. > > To date, the National Highway Traffic Safety Administration has > evaluated software and electronic systems only as part of other > reviews, such as whether an air bag deploys when it is supposed to, a > spokeswoman said. The agency doesn't have any software or electronics > specialists on staff, she added. > > Auto software has some distinct characteristics. For one thing, the > programs are relatively simple and are designed to be embedded in > simple components—typically eight-bit and 16-bit computer chips, > compared with more advanced 32-bit and 64-bit microprocessors found in > most personal computers. > > The simplicity is intended to make the software more reliable—the > fewer things it is asked to do, the less likely it is to experience a > problem. > > Indeed, Mr. Krueger said automotive software has led to some of the > biggest jumps in safety and fuel efficiency. Electronic > stability-control systems, which detect when a car is skidding and > automatically deploy the brakes, have reduced the number of vehicles > that flip over, he said. > > In an effort to improve the quality of software in vehicles several > car makers in 2003 founded the Automotive Open System Architecture > group to create standards. These systems have become enormously > complex, said Simon Fuerst, a spokesman for the group, all the more so > because car makers traditionally use their own proprietary software > formats. > > Raj Rajkumar, professor of electrical and computer engineering at > Carnegie Mellon University, has recently been studying the software in > a Lexus IS250, a car made by Toyota, that experienced sudden > acceleration. His hypothesis is that a software glitch caused the > vehicle's fail-safe mode—which typically shuts off or reduces engine > power in the event of a system failure—to not to kick in when it > should. > > But he said he isn't certain and his study is made more difficult by > the fact he doesn't have access to the software code used in the car. > > Mr. LaHood on Tuesday said that many members of Congress feel "there's > something wrong with the electronics, not only just in Toyotas but in > other automobiles, too. We felt that we really needed to look into > this." > —Josh Mitchell contributed > to this article.Printed in The Wall Street Journal, page B1 > > Copyright 2009 Dow Jones & Company, Inc. All Rights Reserved > > This copy is for your personal, non-commercial use only. Distribution > and use of this material are governed by our Subscriber Agreement and > by copyright law. For non-personal use or to order multiple copies, > please contact Dow Jones Reprints at 1-800-843-0008 or visit > > www.djreprints.com > More In Auto Industry News > > * Email > * Printer Friendly > * Order Reprints > * > * > Share: > o > > facebook > facebook > o > > Twitter > Twitter > o > > Digg > Digg > o > > StumbleUpon > StumbleUpon > o > > Viadeo > Viadeo > o > > Orkut > Orkut > o > > Yahoo! Buzz > Yahoo Buzz > o > > Fark > Fark > o > > Reddit > Reddit > o > > LinkedIn > LinkedIn > o > > del.icio.us > del.icio.us > o > > MySpace > MySpace > * > > * > Back To > > * Back To > * > * > MSN Money Homepage > * > MSN Money Investing > > Companies within this Article > Toyota Motor Corp. 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ANN: tbox-0.1.0: Transactional variables and data structures with IO hooks
by Peter Robinson 02 Apr '10

02 Apr '10

This package [1] provides STM data structures with IO hooks. The basic building blocks are instances of class TBox. Such an instance is an STM variable that might contain a value of some type a. In contrast to a plain 'TVar (Maybe a)', a TBox has IO hooks that are executed transparently on writes and reads. The IO hooks of the AdvSTM monad extend the atomicity of STM transactions to the on-commit IO actions, which makes it particularly suitable for implementing a persistent and thread-safe storage. Currently the only instance of class TBox is type TFile. A TFile serializes its content to a file using Data.Binary. New in this release is the implementation of a skip list in module Control.Concurrent.TBox.TSkipList that provides thread-safe persistency. A skip list is a probabilistic data structure that provides expected run time of O(log n) for dictionary operations (insert, lookup, filter, leq, min, delete, update) similar to a balanced tree. The main advantage of a skip list is that it does not need rebalancing, which could lead to high contention among transactions. The TFile-skip list instance tries to reconstruct the content of its elements from the TFile-directory. See module Control.Concurrent.TFile.TSkipList for a usage example. Feedback is highly appreciated! [1] http://hackage.haskell.org/package/tbox

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Immix GC as a Soc proposal
by Marco Túlio Gontijo e Silva 02 Apr '10

02 Apr '10

Hi. I've written a Google Summer of Code proposal for implementing the Immix Garbage Collector in GHC[0]. It's not on dons list of the 8 most important projects[1], but I only saw that list after the proposal is done. I'd like to hear comments about it, specially about its relevance, since it's not on the list of 8. 0: http://www2.dcc.ufmg.br/laboratorios/llp/wiki/doku.php?do=show&id=marco_soc 1: http://donsbot.wordpress.com/2010/04/01/the-8-most-important-haskell-org-gs… I'm planning to write another proposal, maybe about "LLVM Performance Study", "LLVM Cross Compiler", "A Package Versioning Policy Checker" or "“cabal test”", if mentors think they're more relevant than my current proposal. Please let me know if this is the case. Greetings. -- marcot http://wiki.debian.org/MarcoSilva

3 2

(no subject)
by Vasili I. Galchin 02 Apr '10

02 Apr '10

* * * * * * * More o BigCharts o Virtual Stock Exchange o FiLife.com o WSJ Asia o WSJ Europe o WSJ Portuguese o WSJ Spanish o WSJ Chinese o WSJ Japanese o WSJ Radio o Financial News SEARCH * Wednesday, March 31, 2010 Autos o Welcome, William Halchin Logout o + My Account + My Journal + Help + Message Center ( new) * U.S. Edition WSJ.com is available in the following editions and languages: o U.S. o Asia + India + China + Japan o Europe o Americas + en Español + em Português o Login/Register to set your edition o Set my edition o Today's Paper o Video o Columns o Blogs o Topics o Journal Community Register for FREE Register for FREE Thank you for registering. We sent an email to: Please click on the link inside the email to complete your registration Please register to gain free access to WSJ tools. An account already exists for the email address entered. Forgot your username or password? This service is temporary unavailable due to system maintenance. Please try again later. 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To order presentation-ready copies for distribution to your colleagues, clients or customers, use the Order Reprints tool at the bottom of any article or visit www.djreprints.com See a sample reprint in PDF format. Order a reprint of this article now * The Wall Street Journal * MARCH 31, 2010 Now, Even NASA Is Involved in Toyota Crisis * Article * Comments (2) more in Auto Industry News » * Email * Print * Save This ↓ More * o facebook facebook o Twitter Twitter o Digg Digg o StumbleUpon StumbleUpon o + More close o Yahoo! Buzz o MySpace o del.icio.us o Reddit o LinkedIn o Fark o Viadeo o Orkut * larger Text smaller By BEN WORTHEN U.S. regulators on Tuesday announced a broad investigation into automotive computer systems and software, which have come under scrutiny because of sudden acceleration and other reports involving some Toyota Motor Corp. cars. An examination of Toyota's problems will be conducted by experts from the National Aeronautics and Space Administration, while the National Academy of Sciences, which advises the government, will undertake a separate, 15-month study into the use of computer technology in cars, U.S. Transportation Secretary Ray LaHood said. Toyota has said there is no evidence that software or electronic systems are responsible for sudden acceleration in its cars. The company "repeatedly and rigorously" tests its software and has subjected it to outside review, a spokesman said. Electronics have led to some of the biggest safety breakthroughs in vehicles, such as antilock brakes and stability control. Software controls an ever-growing variety of functions in cars, including braking and accelerating. Increasingly, cars include software that links these systems to do things like parallel park the vehicle or remember the seat positions, temperatures and radio stations preferred by different drivers. "Ninety percent of all innovation in cars today is driven by software," said Ingolf Krueger, an associate professor of computer science and engineering at the University of California in San Diego. No surprise then that software is sometimes to blame when things go wrong. While Toyota has received most of the attention, other car makers have had software-related incidents. Ford Motor Co.'s 2010 Fusion Hybrid has a high-tech braking system that also recharges its battery through a process called regenerative braking. Software monitors sensors in the car and determines when to engage the conventional braking system instead. Several drivers filed complaints with the National Highway Traffic Safety Administration, the agency responsible for vehicle safety, stating that they depressed the brake pedal as far as possible but the brakes didn't engage. A Ford spokesman said a sensor on the car was set too sensitively and that software interpreted the signal to mean it should skip the regenerative braking step. The company issued a software upgrade that it said would take care of the issue, avoiding a recall. In November 2008, General Motors Co. recalled 12,662 of its 2009 model year Cadillac CTS sedans because a software glitch caused the passenger-side air bag to be turned off when it should have been active. That same year, Volkswagen AG recalled 4,079 2008 Passats because of software that didn't properly control the engine idle while the air conditioning was on. And Toyota in February recalled 2010 Priuses to fix the software in their antilock brakes that some owners said led to delays in the brakes engaging. To date, the National Highway Traffic Safety Administration has evaluated software and electronic systems only as part of other reviews, such as whether an air bag deploys when it is supposed to, a spokeswoman said. The agency doesn't have any software or electronics specialists on staff, she added. Auto software has some distinct characteristics. For one thing, the programs are relatively simple and are designed to be embedded in simple components—typically eight-bit and 16-bit computer chips, compared with more advanced 32-bit and 64-bit microprocessors found in most personal computers. The simplicity is intended to make the software more reliable—the fewer things it is asked to do, the less likely it is to experience a problem. Indeed, Mr. Krueger said automotive software has led to some of the biggest jumps in safety and fuel efficiency. Electronic stability-control systems, which detect when a car is skidding and automatically deploy the brakes, have reduced the number of vehicles that flip over, he said. In an effort to improve the quality of software in vehicles several car makers in 2003 founded the Automotive Open System Architecture group to create standards. These systems have become enormously complex, said Simon Fuerst, a spokesman for the group, all the more so because car makers traditionally use their own proprietary software formats. Raj Rajkumar, professor of electrical and computer engineering at Carnegie Mellon University, has recently been studying the software in a Lexus IS250, a car made by Toyota, that experienced sudden acceleration. His hypothesis is that a software glitch caused the vehicle's fail-safe mode—which typically shuts off or reduces engine power in the event of a system failure—to not to kick in when it should. But he said he isn't certain and his study is made more difficult by the fact he doesn't have access to the software code used in the car. Mr. LaHood on Tuesday said that many members of Congress feel "there's something wrong with the electronics, not only just in Toyotas but in other automobiles, too. We felt that we really needed to look into this." —Josh Mitchell contributed to this article.Printed in The Wall Street Journal, page B1 Copyright 2009 Dow Jones & Company, Inc. All Rights Reserved This copy is for your personal, non-commercial use only. Distribution and use of this material are governed by our Subscriber Agreement and by copyright law. For non-personal use or to order multiple copies, please contact Dow Jones Reprints at 1-800-843-0008 or visit www.djreprints.com More In Auto Industry News * Email * Printer Friendly * Order Reprints * * Share: o facebook facebook o Twitter Twitter o Digg Digg o StumbleUpon StumbleUpon o Viadeo Viadeo o Orkut Orkut o Yahoo! Buzz Yahoo Buzz o Fark Fark o Reddit Reddit o LinkedIn LinkedIn o del.icio.us del.icio.us o MySpace MySpace * * Back To * Back To * * MSN Money Homepage * MSN Money Investing Companies within this Article Toyota Motor Corp. 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1 0

ANN: New wxHaskell
by Daniel Fischer 01 Apr '10

01 Apr '10

I've uploaded a new wx-suite, wxdirect-0.12.1.3, wxcore-0.12.1.4, wx-0.12.1.4, wx now builds with ghc-6.10 and ghc-6.12, sorry for breaking 6.10 earlier.

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Re: [Haskell-cafe] OT: the format checker for ICFP 2010 papers, help!
by Wouter Swierstra 01 Apr '10

01 Apr '10

I just thought I'd pass on Stephanie's response, as she couldn't post to the list: > It looks like the SIGPLAN class file has gotten out of sync with the paper requirements and > is producing a slightly too large textblock. I just checked the template (filled out with random text) > against the format checker. It fails. > > In this situation, it seems wisest to go with the class file instead of the stated height requirement. > I've upped the format checker to a max 9.5in height to account for this discrepancy. Hope this helps, Wouter

1 0

OT: the format checker for ICFP 2010 papers, help!
by Iustin Pop 01 Apr '10

01 Apr '10

This is off-topic, apologies in advance, but I hope people here have experience with this. I submitted a paper for ICFP but the paper checker says: “Margins too small: text block bigger than maximum 7in x 9in on pages 1–6 by 4–5% in at least one dimension”. Now, I've used the standard class file and template, didn't alter any of the margins/columns spacing, my paper size is set to letter, and pdflatex doesn't give me any overfull hboxes. Does anyone know why the error happens in this case? Also, if the format checker is available somewhere for download so that I can pre-check my paper, that'd be great. thanks, iustin

3 3