Squeak-dev May 2002

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160 participants
453 discussions

World Cup betting site!
by goran.hultgren＠bluefish.se 27 May '02

27 May '02

Jonas and I at Bluefish have whipped together a pretty nifty little betting site at Bluefish (all in Squeak/Comanche/HttpView of course). It's currently in Swedish only, but even so you might be able to understand how it works - it ain't rocket science: http://vm-tips.bluefish.se - First you register an account: username, password, verify password, companyname - if your company is not in the dropdownlist then type it in. - Then you click on "Mitt VM-tips" which means "My World Cup betting" (or something like that). It's pretty selfexplanatory I guess. Go through the groups (or all at the same time with "Alla grupper") and guess the scores. - Visit http://vm-tips.bluefish.se daily to see what games are on for today/tomorrow and see the current scorelist! You can filter on your company name. Important: The betting will freeze on thursday the day before the first game. regards, Göran PS. Got to run now, perhaps I will be able to translate this to english tomorrow... DS PSS. If you want help, email me. DSS

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bug? SoundPlugin
by Niko Schwarz 27 May '02

27 May '02

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hmm, and the voice chat seems to have a lil prob, at least this primitive here fails for me: <primitive: 'primitiveSoundRecordSamples' module:'SoundPlugin'> "primitiveExternalCall" stack: [...] ChatRecorder(SoundRecorder)»recordLoop [] in ChatRecorder(SoundRecorder)»startRecording sound replay wordks fine, otoh. regards, nick - -- "I'd love to go out with you, but I did my own thing and now I've got to undo it." -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (GNU/Linux) Comment: For info see http://www.gnupg.org iD8DBQE88NpOc9uyCiO8RNQRAsgTAJ4o8btrFOj4wg5IxRw8YF33IXwt8gCdFGj6 /1hrCj4GXKLSW6J2Uq5kUeY= =ADwx -----END PGP SIGNATURE-----

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[bug] [fix] Problem with fonts in ArchiveViewer
by Dan Ingalls 27 May '02

27 May '02

ArchiveViewer>>createButtonBar contains a potential bug for any image with fonts that are not registered in TextStyles found in TextConstants. I have such in a couple of my images. The problem is that if one of them happens to be the smallest font, then the code at the bottom of the method eventually ends up in TextMorph>>fontName: fontName size: fontSize | newTextStyle | newTextStyle _ (TextStyle named: fontName asSymbol) copy. newTextStyle ifNil: [self halt: 'Error: font ', fontName, ' not found.']. The attached method fixes the problem, but it still suffers from supplying overly small fonts if they are available. I have a feeling things were better a few changes ago, simply using a known small font. - Dan

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[GOODIE][Modules][Experimental] AnalysisUtils (0.2)
by Daniel Vainsencher 27 May '02

27 May '02

from preamble: "Change Set: AnalysisUtils Date: 25 May 2002 Author: Daniel Vainsencher version (0.2): fixed a bug in the analysis - now treat both instance and class methods as belonging to the concrete class. Separating the meta class is not appropriate for this analysis. Prerequisites: MoreAnalysis.1.cs Experimental tools to guide the refactoring system (graph theory is our friend!!). First the fundemental algorithms, then the easy interface. StrongComponentsFinder implements a cache for class dependency information, including the inverted dependencies, and two useful graph algorithms - findWeakComponents: collectionOfClasses will return a collection of sets of classes that are dependent on one another. If a module has more than one of these, we can separate it into these groups and they will be non-interdependent modules. It will sometimes make sense to have two weak components in the same module if the same modules use them both, but it's a good heuristic. This is useful because it will reduce the class count in the minimal system, remove dependencies on the core, and thus expose the core of the problem, without requiring any refactoring of code... findStrongComponentsForNodes: collectionOfClasses will return a collection of collections of classes that are cyclicly dependent on one another. These are groups that can only be unloaded atomically, so if they're big they probably need refactoring. Run on any big chunk of the system, the strong components will show you what needs to be taken apart most urgently. Just find any one class in there that you think should be optional, and start severing dependencies on it. ModuleAnalyzer reportFor: aModule on: aStream will spill a nice detailed analysis of your favorite module in terms of the above algorithms, showing a lot bout what can and should be done... favorite usage: ModuleAnalyzer reportFor: Module root Squeak Morphic on: Transcript. Transcript endEntry <do it> ClassDependencyViewer is just a beginning of something. Help from someone handy with simple Morphic lists and drag&drop would be much appreciated. Mail me.."!

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[BUG?] ProtoObject class superclass = nil
by Dan Rozenfarb 27 May '02

27 May '02

Hi all, I was preparing the class about metaclasses for our students, which tend to be scared about such issues, when I got scared myself. Much to my surprise, ProtoObject class superclass returns nil. I was expecting it to return Class, but nope. Am I wrong? For further checking, I tried Class inspect and obtained an inspector over Class class, which is fine. Then I looked at subclasses of it, and it DOES contain ProtoObject class among them. Is this a bug? I have tried it on 2.8, several 3.2 versions and in 3.0 (which is the one that we recommend to our students). Regards, Dan Rozenfarb __________________________________________________ Do You Yahoo!? LAUNCH - Your Yahoo! Music Experience http://launch.yahoo.com

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morphic slowdown
by Avi Bryant 27 May '02

27 May '02

Just another datapoint on Aaron's observation about 2.6 morphic being more responsive than more recent versions - I was amazed by how much difference there was, so tried out some other versions. 2.8pre3 (2359) is still speedy, whereas 2.9a (3125) is slower. I don't have an image in between those two, although presumably there were some snapshots made during those 800 changes that someone could find. I assume this slowdown is a known thing for those who were around pre-3.0. What was the change from 2.8 to 2.9?

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Michigan Squeak user group meeting: June 13th
by Doug Way 27 May '02

27 May '02

I and a few other people are starting up regular monthly meetings of Squeak-interested folks here in Ann Arbor, Michigan. (We had our first meeting last month.) The meetings are actually very informal without a real agenda. A small amount of time is spent chatting about Squeak-related topics and setting up our laptops, and the rest of the time is spent in small groups doing some Squeak show & tell, and also some pair programming. Everyone is invited... it's a great way to get some in-person help with Squeak. The next meeting is Thursday, June 13th at 7pm, here at the RiskMetrics office in Ann Arbor. For now, I'd like to keep rough track of how many people will show up, so just email me if you're interested and I can give you directions on how to get here. Also let me know if you're interested in meeting at different times... our current time is not set in stone. - Doug Way dway(a)riskmetrics.com

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Re: RE: morphic slowdown
by Bob Arning 26 May '02

26 May '02

On Sat, 25 May 2002 01:02:54 -0700 (PDT) Avi Bryant <avi(a)beta4.com> wrote: >Here's the most telling thing I've come up with, trying to automate the >act of switching classes in the browser: > >b := Browser new. >Browser openBrowserView: (b openEditString: nil) label: 'System Browser'. >(Collection allSubclasses collect: > [:c | > c methodDictionary size -> > (Time millisecondsToRun: [b setClass: c selector: nil])]) > asSortedCollection Avi, There may be several factors that add up to the difference you see. One of them is that in 2.8, selecting a class did NOT select a method category and thus showed an empty message list. In 2.9, the '-all-' category gets selected by default and this causes the message list to be populated. Bigger classes take longer to do this. Cheers, Bob

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Morphic, Dynapad, and Squeak performance
by Tommy Thorn 26 May '02

26 May '02

Aaron, I hate to chip in as I truly believes that code speak much stronger than words. But as PDA usage was the reason I started learning Squeak, I do feel a little worried about moving dynapad away from Morphic because of performance issues. Consider that, 1. the use of something like Morphic as opposed to, say, MVC, is critical for enabling small apps to be designed on the road 2. the portability of Squeak is outstanding. In all likelyhood you/we would move Dynapad with out as you upgrade your PDA to the next (necessary more powerful) unit. The choice between MVC and Morphic will almost certainly look different at that time and I believe that designing for the present might hurt in the future. 3. last, but not least, I have a some amount of experience with implementation of programming languages, especially lazy functional languages like Haskell. When I saw how Squeak is implemented I was just blown away at how fast Squeak actually feels given its a bytecode interpreter with a global method cache. I stand in awe at how well designed Squeak is and how works, but never the less, it seems to me that the performance could be improved quite a lot if it had to. For most desktop systems Squeak already performs quite adequate, so there may be less motivation. On embedded devices we need better performance for Morphic to be usable. Caveat: I'm AM a Smalltalk beginner and I do know and appreciate all the hard work that people have been doing to improve performance. I also do know that probably what I'm about to suggest has been or is being considered. First of, I'm not sure that the ARM/StrongARM VM has really been carefully handtuned. I know there are some gcc issues that affects performance. The first and easy step is attacking this with profiling tools and carefully handtweaking. This most likely affect the portability of the VM (but not the image), but that's the first price to accept. Secondly, it really not that hard to do make the VM do dynamic native code generation for frequently executed methods (I know Squeak does have a Jitter, but AFAIK is doesn't generate native code). Even simple minded template based instantiation can improve performance by a factor of four and more can be had with varing degree of runtime optimization. Thirdly, the current implementation of message sends is not exactly state of the art (although it has a lot of nice properties). If you admit to native JITing, then one option is to make message sends implement their own cache in compiled form (that is, a cache miss could cause the recompilation of the send). There are other less dramatic option: attaching the compiled cache to the class instead, or applying a global enumeration scheme to speed up method lookup for cache misses [1]. Fourth, in the long run, Squeak could be changed to better suit I'm convinced that it's technically feasible to make Squeak on StrongArm fast enough to make Morphic usable. I'm just not sure if we have enough collective spare cycles to make it happen. [1] Taming Message Passing: Efficient Method Look-Up for Dynamically Typed Languages (1994), Jan Vitek, R. Nigel Horspool All the best, Tommy __________________________________________________ Do You Yahoo!? LAUNCH - Your Yahoo! Music Experience http://launch.yahoo.com

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[ENH] MoreAnalysis
by Daniel Vainsencher 26 May '02

26 May '02

Probably requires Henriks latest updates to modules. from preamble: "Change Set: MoreAnalysis Date: 26 May 2002 Author: Daniel Vainsencher Tiny additions to the module API to round it out."!

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