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[Pharo-project] Wrong number with message tally?
by Alexandre Bergel Dec. 24, 2011

Dec. 24, 2011

Hi! MessageTally seems to give wrong values regarding the relative time spent. Consider: MessageTally spyOn: [ 100 timesRepeat: [ 1000 factorial ] ] It gives something like: -=-=-=-=-=-=-=-=-=-=-=-= - 377 tallies, 379 msec. **Tree** -------------------------------- Process: (40s) 464519168: nil -------------------------------- 65.8% {249ms} SmallInteger(Integer)>>factorial 65.8% {249ms} SmallInteger(Integer)>>factorial 65.8% {249ms} SmallInteger(Integer)>>factorial 65.8% {249ms} SmallInteger(Integer)>>factorial ... -=-=-=-=-=-=-=-=-=-=-=-= I would expect to have 100% at the root of the call graph since other threads are not reported. Is there something I am missing? If no, then I will dive into MessageTally. This is annoying. Cheers, Alexandre -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.

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[Pharo-project] [update 1.4] #14265
by StÃ©phane Ducasse Dec. 24, 2011

Dec. 24, 2011

- Issue 5124: Chronology Printing/Accessing Efficiency Improvements. Thanks Sven van Caekenberghe. http://code.google.com/p/pharo/issues/detail?id=5124 - Issue 5067: Make package cache location changeable (first part). Thanks Mariano Martinez-Peck. http://code.google.com/p/pharo/issues/detail?id=5067. - Issue 4866: NonInteractiveTranscript Thanks Sven van Caekenberghe. http://code.google.com/p/pharo/issues/detail?id=4866 Stef

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[Pharo-project] PBE2 - Draft chapters for review
by jannik.laval Dec. 24, 2011

Dec. 24, 2011

Hi list, As you probably know, the Pharo By Example 2 is in progress. Some chapters will be finished soon. And we hope to provide the whole book in 2012. So, for Chrismas, we provide you some chapters, that you can review. Feel free to send us comments if you have any. The new page is temporarily available here: http://rmod.lille.inria.fr/pbe2/. It currently has the layout of the previous book but will be changed soon. Merry Chrismas ! Jannik

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[Pharo-project] [update 1.4] #14264
by StÃ©phane Ducasse Dec. 24, 2011

Dec. 24, 2011

14264 ----- - Issue 5118: Check pointsTo: and InstVarInclude: in squeak. Thanks levente and mariano. http://code.google.com/p/pharo/issues/detail?id=5118 - Issue 5123: Clone is sent but not defined in FloatArray http://code.google.com/p/pharo/issues/detail?id=5123 - Issue 5112: More consistent SharedPool protocol. Thanks Mariano. http://code.google.com/p/pharo/issues/detail?id=5112 Stef (more to come)â¦but this is sunny today :)

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[Pharo-project] Newbie observations on use of Metacello
by Ben Coman Dec. 23, 2011

Dec. 23, 2011

Some observations from the perspective of as a newbie on Pharo Package Management. I'm likely to me missing in the philosophy of the design, but from the narrow view of my own usage.... 1. When I read about Metacello being the package management system, I expected there to be a "command"(*) Metacallo but instead I see Gopher being used. This is a mixed message that lowers my comfort level feeling I understand the system as I'm trying to pick up a bundle of new ideas. As I now understand it Metacello is more about a system of backend configuration than a front end user interface. I am now more comfortable using Gopher direct - but I reflect on how I felt the first time. (*) While technically a "command" is like a verb, and Gopher is like a noun rather than a verb - I can't yet completely disengage my prior learning that considers the first part of the statement to be a "command" - and I expect other newbies might find the same. 2. The strong convention of naming things ConfigurationOfXXXX is somewhat redundant from a user perspective. 3. If copy-paste into the Workspace from a web site a sample package load (for example b> below) and then highlight the whole thing and execute, it tells me "Unknown variable: ConfigurationOfSqueakDBX, please correct, or cancel" Duh! What? Oh, I need to execute it in two parts. No one wrote that down anywhere.... The alternative "(Smalltalk at: #ConfigurationOfSqueakDBX)" adds further complexity in the eyes of a newbie. Based on the above points, it would be nice to have... a> Metacello configuration: 'SqueakDBX' load rather than... b> Gofer new b> squeaksource: 'MetacelloRepository'; b> package: 'ConfigurationOfSqueakDBX'; b> load. b> ConfigurationOfSqueakDBX project latestVersion load. While only a small saving in typing, I think it significant for newbies in terms of polish and the marketing message that Metacello really is the chosen package management system. A very rough implementation (with much of the syntax likely wrong) might be just... c> Metacello class >> package: aPackage c> | packageConfig | c> packageConfig := 'ConfigurationOf', aPackage; c> Gopher new c> squeaksource: 'MetacelloRepository'; c> package: packageConfig c> load c> ^((Smalltalk at: (packageConfig asSymbol)) Now after I've written the above I contemplate that there must have been an early design decision to not implement a separate Metacello class to avoid duplication/overlap with Monticello. However perhaps now that the system is implemented as it is, a thin shim can be put over the top to assist getting the ConfigurationOfXXX files downloaded. Additional things this Metacello class might later provide: a. Improved reliability by downloading from a system of package repository mirrors. SqueakSource was having some issues and I found [1] a fortunate backup. b. A GUI for browsing package versions c. A GUI for browsing compatibility tables from a continuous integration system that tries different permutations of Montecello packages together. 4. It seems that every ConfigurationOfXXX has its own category in the SystemBrowser. Each of these categories has only one class. This seems to me like unneeded clutter of the System Browser. It would be neater if Metacello specified its configurations to be grouped under a single category "MetacelloConfigurations" or similar. 5. The sample Metacello PBE is very good in the detail for developers to provide configurations. However there is not much directed clearly at a 'mere' user. Even though Smalltalk makes us all developers, newbies all start as mere users while exploring the system. [1] Gofer new url: 'http://dsal.cl/squeaksource/MonticelloRedirect'; package: 'MontiRedirect'; load. MRManager redirectFrom: 'http://www.squeaksource.com/' to: 'http://dsal.cl/squeaksource/'. Cheers, Ben

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[Pharo-project] Two complement smallInteger question
by StÃ©phane Ducasse Dec. 23, 2011

Dec. 23, 2011

Hi I'm doing a pass on the two complement chapter and small integer implementation and I wanted to check the SmallInteger>>primitiveAdd see below: stackIntegerValue extracts from a smalltalk integer the 31 encoding number bit. I imagine that this is correct. sqInt stackIntegerValue(sqInt offset) { DECL_MAYBE_SQ_GLOBAL_STRUCT sqInt integerPointer; integerPointer = longAt(GIV(stackPointer) + (offset * BytesPerWord)); /* begin checkedIntegerValueOf: */ if ((integerPointer & 1)) { return (integerPointer >> 1); } else { /* begin primitiveFail */ if (GIV(primFailCode) == 0) { GIV(primFailCode) = 1; } return 0; } } Now I have three questions: - is two complement used to manage small integers at VM level? I saw digitAdd on Integer and it deals with large integer. - integerResult = (stackIntegerValue(1)) + (stackIntegerValue(0)); performs the real add. I imagine that it comes from plain C. Now does anybody has an idea where I could find the definition of such + procedure? In ANSI C - from the books, performing 54 - 5 is equivalent to adding the two complement i.e. 54 + 5' (two complement) this work well for 54 - 5 correct results and we can follow it looking at binary operations: (2r110110 - 2r101) bitString --> '0000000000000000000000000110001' (2r110110 bitString) --> '0000000000000000000000000110110' 2r101 bitString --> '0000000000000000000000000000101' 2r101 negated bitString --> '1111111111111111111111111111011' Now doing 5 - 15 does not (or I miss something ilke always subtracting the smaller one and taking the two complement of the smallerâ¦) so does anybody has the answer on how to perform 5 - 15 ? static void primitiveAdd(void) { DECL_MAYBE_SQ_GLOBAL_STRUCT sqInt integerResult; char *sp; /* begin pop2AndPushIntegerIfOK: */ integerResult = (stackIntegerValue(1)) + (stackIntegerValue(0)); if (GIV(primFailCode) == 0) { if ((integerResult ^ (integerResult << 1)) >= 0) { /* begin pop:thenPush: */ longAtput(sp = GIV(stackPointer) + ((2 - 1) * BytesPerWord), ((integerResult << 1) | 1)); GIV(stackPointer) = sp; } else { /* begin success: */ if (!(0)) { if (GIV(primFailCode) == 0) { /* Don't overwrite an error code that has already been set. */ GIV(primFailCode) = 1; } } } } } Stef

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[Pharo-project] Guess who is down?
by Bernat Romagosa Dec. 23, 2011

Dec. 23, 2011

Squeaksource! -- Bernat Romagosa.

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[Pharo-project] COTDC
by Sean P. DeNigris Dec. 22, 2011

Dec. 22, 2011

The last three classes got no responses. Do we not want to play anymore? -- View this message in context: http://forum.world.st/COTDC-tp4226492p4226492.html Sent from the Pharo Smalltalk mailing list archive at Nabble.com.

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Re: [Pharo-project] IdentitySet but using #hash rather than #identityHash ?
by Henrik Sperre Johansen Dec. 22, 2011

Dec. 22, 2011

On 16.12.2011 00:40, Henrik Sperre Johansen wrote: > On 15.12.2011 23:35, Mariano Martinez Peck wrote: >> Well...it is much slower :( it seems that the cost of (aKey >> identityHash + ( aKey mareaClass identityHash bitShift: 12) + (aKey >> basicSize bitShift: 24) >> is bigger than the colisions. >> Anyway, thanks for the nice thread. I learned. >> >> Cheers >> > Well, first of all, that always creates a largeInteger, since > identityHash is already shifted by 22... You'd want to be using > basicIdentityHash. > 2nd off, basicSize is useless for non-variable classes, which I guess > is the common case. > 3rd, putting class hash in the high bits won't really help much if > you're serializing many instances of the same class, as they will all > occupy a sequential hash range. > > So if I were you, I'd try with something like > obj basicIdentityHash << 12 + (obj class basicIdentityHash) > before discarding it outright due to computation cost. > > Cheers, > Henry > A few more points: 1) don't use PluggableSets. Block activations are costly, and you REALLY need specialized data/hash functions for it to be worth using. 2) Even with a subclass of IdentitySet, it's hardly worth it: PluggableSet: n := 1000000. set := PluggableSet new: n. set hashBlock: [:obj | obj basicIdentityHash << 12 + (obj class basicIdentityHash) ]. set equalBlock: [ :a :b | a == b ]. Time millisecondsToRun: [1 to: n do: [:waste | set add: Object new.]] 18828 The one I suggested in a custom subclass: n := 1000000. set := PseudoIdentitySet new: n. Time millisecondsToRun: [1 to: n do: [:waste | set add: Object new.]] 14182 Usual identitySet: n := 1000000. set := IdentitySet new: n. Time millisecondsToRun: [1 to: n do: [:waste | set add: Object new.]] 4595 Custom subclass with a slightly modified hash (anObject identityHash + (anObject class basicIdentityHash bitShift: 6)): n := 1000000. set := PseudoIdentitySet2 new: n. Time millisecondsToRun: [1 to: n do: [:waste | set add: Object new.]] 3694 Why 6 you ask? Because I'm worth it. Not really enough to justify the extra compexity, imho. Cheers, Henry

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[Pharo-project] [OT] Pharo and children
by laurent laffont Dec. 22, 2011

Dec. 22, 2011

Hi, my son will soon have 7 years old and starts to show interest in how all these things move on screen. I wonder what are your cool ways to teach programming with instant fun for kids. Any experience ? Cheers, Laurent Laffont - @lolgzs <http://twitter.com/#!/lolgzs> Blog: http://magaloma.blogspot.com/ Developer group: http://www.cara74.org Pharo Smalltalk Screencasts: http://www.pharocasts.com/ Pharo web deployment: http://www.alpha.smallharbour.org

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