October 2010 - Pharo-dev - lists.pharo.org

Re: [Pharo-project] Some questions about pharo
by StÃ©phane Ducasse Oct. 19, 2010

Oct. 19, 2010

This is neat. Thanks for the information. Stef On Oct 18, 2010, at 10:41 PM, Alexander LazareviÄ wrote: > 2010/10/18 Adrien BARREAU <abarreau.dev(a)live.fr>: >> - If I run a headless Pharo, is it possible to display the graphical >> interface after? (for example, if something raises an exception, I want to >> open the GUI and use the debugger) > > It depends. If your headless Pharo image is running on a unix VM you > could utilize the genius OSProcess/XDisplayControl plugin available > for this VM. Load the appropriate packages from [1] into your Pharo > image and then you can close and reopen the window even on another > machine if it's running X11. For example this > > OSProcess thisOSProcess closeXDisplay. > (Delay forSeconds: 5) wait. > OSProcess thisOSProcess displayOnXServer: ':0.0'. > > will close the Window (headless) and reopen it (headful) again on the > local X server after five seconds. > If you're using Seaside in that image you could trigger window > open/close via Seaside or you could change the default handler for > errors to make the window open on the local display as a default, ... > > Alex > > [1] http://www.squeaksource.com/OSProcess > > _______________________________________________ > Pharo-project mailing list > Pharo-project(a)lists.gforge.inria.fr > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project

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Re: [Pharo-project] Stack should be reimplemented with Array
by StÃ©phane Ducasse Oct. 19, 2010

Oct. 19, 2010

Eliot > There was a post on this list back in August complaining about Stack inheriting from LinkedList. There was some discussion, but apparently no resolution, as Stack still inherits from LinkedList in the Pharo 1.2 Core Image I just downloaded. Rather than reimplementing it to forward to a contained LinkedList, I think it should use an Array internally like OrderedCollection does. An Array-based implementation of Stack would be faster than one based on LinkedList due to the basic stack operations (push, pop and top) being able to rely more on primitives. This assumes that you know roughly how a big a stack you need; if you don't, reallocating the array and copying its contents over and over again will cost you, but this is an exceptional case;-- most stacks are small and when they aren't, the programmer usually has enough information to select a reasonable stack size. > > *No*. Stack and OrderedCollection differ *usefully*. Adding an item to a Stack is always O(1). Adding an item to an OrderedCollection is O(N) because when the array overflows a new one must be allocated and the old objects copied to the new. Why not apply your speedups to OrderedCollection, or is that not possible? If not possible, then come up with a new name and add that. Please /don't/ change Stack. I would really like not having Stack inheriting from LinkedList (I hate subclassing). Now from a VM point of view is there a constraint that Stack as to be a subclass of LList? > > > Enclosed is a fileout of an Array-based Stack implementation. It trounces the LinkedList-based implementation easily, but more interestingly, it performs better than an OrderedCollection when used like a stack: > > Pushing is roughly ~30% faster: > r1 :=[100000 timesRepeat: [ > s := Stack new. > 10 timesRepeat: [s push: #foo]]] timeToRun. > r2 := [100000 timesRepeat: [ > oc := OrderedCollection new. > 10 timesRepeat: [oc addLast: #foo]]] timeToRun. > 100 - ((r1 / r2) asFloat * 100). > > as is pushing + popping: > r3 := [100000 timesRepeat: [ > s := Stack new. > 10 timesRepeat: [s push: #foo]. > 10 timesRepeat: [s pop]]] timeToRun. > r4 := [100000 timesRepeat: [ > oc := OrderedCollection new. > 10 timesRepeat: [oc addLast: #foo]. > 10 timesRepeat: [oc removeLast]]] timeToRun. > 100 - ((r3 / r4) asFloat * 100). > _______________________________________________ > Pharo-project mailing list > Pharo-project(a)lists.gforge.inria.fr > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project > > _______________________________________________ > Pharo-project mailing list > Pharo-project(a)lists.gforge.inria.fr > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project

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[Pharo-project] SharedQueue doesn't scale
by Igor Stasenko Oct. 19, 2010

Oct. 19, 2010

Hello, just out of interest, i tried to compare the speed of my FIFOQueue implementation and SharedQueue, using Levente's benchmarks for stack: "The linked Stack implementation" (1 to: 5) collect: [ :run | | stack | Smalltalk garbageCollect. stack := FIFOQueue new. { [ 1 to: 1000000 do: [ :each | stack nextPut: each ] ] timeToRun. [ 1 to: 1000000 do: [ :each | stack next ] ] timeToRun } ] #(#(291 69) #(170 65) #(168 66) #(168 65) #(168 65)) Then i changed FIFOQueue to SharedQueue and run it again.. waiting 1 minute.. wait a bit more.. then i came to smoke.. and after returning, it was still running.. i interrupted it, and inspected the queue size.. it was slightly above 300000 items. Of course, SharedQueue usually not used in scenarios, where you need to push such large number of items. So, its just a warning. Btw, here is another comparison (Stack vs thread-safe LIFO queue): (1 to: 5) collect: [ :run | | stack | Smalltalk garbageCollect. stack := Stack new. { [ 1 to: 1000000 do: [ :each | stack push: each ] ] timeToRun. [ 1 to: 1000000 do: [ :each | stack pop ] ] timeToRun } ] Stack: #(#(166 94) #(160 90) #(162 91) #(162 92) #(160 92)) LIFOQueue: #(#(172 250) #(174 248) #(172 250) #(174 252) #(172 250)) Yes, it is slower (mainly for reading). But it is price for being thread safe :) -- Best regards, Igor Stasenko AKA sig.

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Re: [Pharo-project] bad bracket autocompletion in Pharo Core 1.2
by StÃ©phane Ducasse Oct. 19, 2010

Oct. 19, 2010

> > > On Sun, Oct 17, 2010 at 10:51 AM, StÃ©phane Ducasse <stephane.ducasse(a)inria.fr> wrote: > > I have a question: > > does shout support closing parenthesis behavior? > > > > > > > > I wonder the same. I don't see the difference between this and shout smart characters. > > so may be we could remove this and keep smart characters. > Now that there is a setting we could try and see. > > Do you know where/why/who added this? because I guess there is a reason that we don't see. In fact I do not understand :) since ithought that the code was coming from cuis and cuis does not implement it at all. may this is evil autogenerating code :) Stef

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[Pharo-project] SqueakSource are down
by Igor Stasenko Oct. 18, 2010

Oct. 18, 2010

Hello, :( Guys, are there a reason , why we can't address this problem once and for all? -- Best regards, Igor Stasenko AKA sig.

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[Pharo-project] Speeding up Pharo 1.1
by Bart Veenstra Oct. 18, 2010

Oct. 18, 2010

Hi list, I have been working with Pharo for almost a month now, and I suspect that the performance is degrading fast. UI tasks takes several seconds to react to my keyboard. At work we use VAST and I have experience with VW as well and those smalltaks react to my keyboard and mouse actions instantly. But Pharo works very sluggish. My image is about 130MB because I have loaded all dutch postcode in memory, but that should not affect the performance of general operations like typing with the keyboard. I am not a fast typer, but sometimes it takes seconds to show my keyboard input. I can't use the down key to select the right method from suggestions, because it seems to lockup completely. Are there ways to speedup Pharo? I would love to use cogVM but I haven't got gemtools working on it... Will upgrading to 1.1.1 fix these issues? Is my OS (Windows 7-64bit) causing these issues? Regards, Bart

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[Pharo-project] Some questions about pharo
by Adrien BARREAU Oct. 18, 2010

Oct. 18, 2010

Hello =) I have a few questions: - If I run a headless Pharo, is it possible to display the graphical interface after? (for example, if something raises an exception, I want to open the GUI and use the debugger) - I wanna run Pharo as a deamon; how can I interact with it after i launched it? (for example, if I want to give it a piece of code to execute). Adrien.

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[Pharo-project] A Lazy Inspector?
by Oscar E A Callau Oct. 18, 2010

Oct. 18, 2010

Hello all, I was wondering what actually the inspector does in the following case: When you explore (or inspect) the expression: Class environment you get all classes in the system dictionary. If you navigate inside a class, for example AColorSelectorMorph, you can see all its properties and one of them is environment, if you go inside it, you get again all classes in the system dictionary. So, you can repeat this infinitely (or until you get run out of memory, I guess) Is it the behavior of a lazy inspector? If true, why I cannot inspect a mutually-recursive class definition, like this: Object subclass: #Foo instanceVariableNames: 'bar' classVariableNames: '' poolDictionaries: '' category: '' Foo>>initialize bar:= Bar new Object subclass: #Bar instanceVariableNames: 'foo' classVariableNames: '' poolDictionaries: '' category: '' Foo>>initialize bar:= Foo new Thanks in advance. P.S.: How can I stop my execution in the pharo image when it is in a infinite loop? I can't remember what the shortcut was.

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[Pharo-project] call for scripting idea
by stephane ducasse Oct. 18, 2010

Oct. 18, 2010

Hi we would like to exercise a bit our scripting engine :) so if you have ideas of scripts that we should be able to write let us know. Stef

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Oct. 18, 2010

in this case we should focus on the next item and provide two images one for the debugging scenario and one for normal running of script. Stef On Oct 18, 2010, at 9:58 PM, Pavel Krivanek wrote: > On Mon, Oct 18, 2010 at 9:05 PM, Schwab,Wilhelm K <bschwab(a)anest.ufl.edu> wrote: >> The Windows vm displays a system tray icon that allows the image to leave the headless state. It has been quite useful, but there should be (hopefully is) a way to prevent that. > > I think that someone asked on squeak-dev some time ago and Andreas > told that it is not possible with the standard VM. > > -- Pavel > > >> ________________________________________ >> From: pharo-project-bounces(a)lists.gforge.inria.fr [pharo-project-bounces(a)lists.gforge.inria.fr] On Behalf Of Lukas Renggli [renggli(a)gmail.com] >> Sent: Monday, October 18, 2010 2:09 PM >> To: Pharo-project(a)lists.gforge.inria.fr >> Subject: Re: [Pharo-project] Some questions about pharo >> >> See <http://book.seaside.st/book/advanced/deployment/maintaining/vnc>. >> >> Cheers, >> Lukas >> >> 2010/10/18 Adrien BARREAU <abarreau.dev(a)live.fr>: >>> Hello =) >>> >>> I have a few questions: >>> >>> - If I run a headless Pharo, is it possible to display the graphical >>> interface after? (for example, if something raises an exception, I want to >>> open the GUI and use the debugger) >>> >>> - I wanna run Pharo as a deamon; how can I interact with it after i launched >>> it? (for example, if I want to give it a piece of code to execute). >>> >>> Adrien. >>> >>> _______________________________________________ >>> Pharo-project mailing list >>> Pharo-project(a)lists.gforge.inria.fr >>> http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project >>> >> >> >> >> -- >> Lukas Renggli >> www.lukas-renggli.ch >> >> _______________________________________________ >> Pharo-project mailing list >> Pharo-project(a)lists.gforge.inria.fr >> http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project >> >> _______________________________________________ >> Pharo-project mailing list >> Pharo-project(a)lists.gforge.inria.fr >> http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project >> > > _______________________________________________ > Pharo-project mailing list > Pharo-project(a)lists.gforge.inria.fr > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project

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