May 2014 - Pharo-dev - lists.pharo.org

Re: [Pharo-dev] The funny side of Pharo : Message Definitely Not Understood

by Nicolas Cellier

2014-05-20 4:42 GMT+02:00 Alexandre Bergel <alexandre.bergel(a)me.com>: > Some students have also tried to update Pharo using the update stream. Is > this still used? Should nt it be removed > > Alexandre > > How I see it: Pharo team wants to perform deep changes into the system. Pharo team wants to perform those changes fast, and not be swamped like they think squeak is (it sure was! but let's say that Squeak values backward compatibility which is naturally a drag). It might be difficult/take a long time to find a way to perform these changes in a reproducible way in customers' images. So the philosophy it let updateStream tools available, but do not bother with update stream if it's too difficult. It's without any guaranty and I often saw it fail (once every few dozens of updates...) I'd say keep it as is. Nicolas > > Le 19-05-2014 Ã 15:49, kilon alios <kilon.alios(a)gmail.com> a Ã©crit : > > > > I felt adventurous today, so I said what the hell lets try to update > Pharo with the updater tool. So I used world menu navigated to system and > choose software update. And after a long download and method's compiling > the attached image appeared :) > > > > > > > > > > <Screen Shot 2014-05-19 at 22.46.28.png> > >

May 20, 2014

Re: [Pharo-dev] Aconcagua Hashing Bug?

by Nicolas Cellier

2014-05-20 8:17 GMT+02:00 phil(a)highoctane.be <phil(a)highoctane.be>: > On Tue, May 20, 2014 at 7:28 AM, Sven Van Caekenberghe <sven(a)stfx.eu>wrote: > >> So ? >> >> 1/2 hash ~= 0.5 hash >> > > ((1/2) hash = 0.5 hash) true > ((1/2) hash ~= 0.5 hash) true > > and > > ((1/3) hash =(1.0/3) hash) false > > The implementation (in 3.0) has a special case for denominator is a power > of 2: > > Fraction>>hash > "Hash is reimplemented because = is implemented. > Care is taken that a Fraction equal to a Float also have an equal hash" > > | tmp | > denominator isPowerOfTwo ifTrue: [ > "If denominator is a power of two, I can be exactly equal to a Float" > tmp := self asFloat. > tmp isFinite ifTrue: [^tmp hash]]. > "Else, I cannot be exactly equal to a Float, use own hash algorithm. > (Assume the fraction is already reduced)" > ^numerator hash bitXor: denominator hash > > > Float>>hash > "Hash is reimplemented because = is implemented. Both words of the float > are used; 8 bits are removed from each end to clear most of the exponent > regardless of the byte ordering. (The bitAnd:'s ensure that the > intermediate results do not become a large integer.) Slower than the > original version in the ratios 12:5 to 2:1 depending on values. (DNS, 11 > May, 1997)" > > (self isFinite and: [self fractionPart = 0.0]) ifTrue: [^self truncated > hash]. > ^ (((self basicAt: 1) bitAnd: 16r00FFFF00) + > ((self basicAt: 2) bitAnd: 16r00FFFF00)) bitShift: -8 > > > Mmmh, I am curious to know what the rationale for this is. > > A Float exact representation is of the form (-1 raisedTo: signBit) * integerSignificand * (2 raisedTo: biasedExponent). Thus it is either an Integer, or a Fraction whose denominator is a power of 2 (when biasedExponent < 0). In Squeak and Pharo, Float equality versus other numbers is based on equality of exact representation. I think this has been changed too in Dolphin and gst, but not in VW. So a naive implementation of hash matching those equality rules could be Float>>hash ^self asTrueFraction hash But we try to avoid sending asTrueFraction because it costs (involves LargeInt arithmetic), so the logic for hash is: if Float can be an integer, convert it to integer. if Fraction could be a Float, convert it to Float. Note that we could also check the other requirement (Fraction numerator highBitOfMagnitude <= Float precision). Also note that ^ (((self basicAt: 1) bitAnd: 16r00FFFF00) + ((self basicAt: 2) bitAnd: 16r00FFFF00)) bitShift: -8 is the historical Squeak hash method for Float and is really POOR (many collisions, only half bits are used !!!) I think I changed it in Squeak, but can't remember. > Getting into: > > Fraction>>isPowerOfTwo > |reduced| > reduced := self reduced. > ^(reduced numerator = 1 and: [reduced denominator isPowerOfTwo]) > or: [reduced denominator = 1 and: [reduced numerator isPowerOfTwo]] > > calls in >>reduced, which in turn calls gcd: ... > > That's quite something to be aware of. > > I don't see no need for reduced here. All Fraction are (should be) reduced. replaced reduced by self, and you won't get any gcd: > Phil > > >> >> I mean what would you expect, how should this have to work ? >> >> Maybe the hashing specialists have something to say about this. >> >> On 20 May 2014, at 01:38, Sean P. DeNigris <sean(a)clipperadams.com> wrote: >> >> > (1/2) teaspoons hash ~= 0.5 teaspoons hash >> > >> > b.t.w. Phexample caught this automatically because it checks hashes when >> > comparing for equality... pretty cool >> > >> > >> > >> > ----- >> > Cheers, >> > Sean >> > -- >> > View this message in context: >> http://forum.world.st/Aconcagua-Hashing-Bug-tp4759622.html >> > Sent from the Pharo Smalltalk Developers mailing list archive at >> Nabble.com. >> > >> >> >> >

May 20, 2014

Re: [Pharo-dev] Pharo in Rasbian ?

by Jean Baptiste Arnaud

>> FFI for the raspberry pie was finished for the Pharo vm 3 weeks ago. Wait a second. Nope. FFI, have been implemented and integrated on CogVM repository by Doug since 3 week, yes, not in Pharo repository. There are small differences between CogVM and PharoVM. A simple operation of extraction, installation, test , merge with the stable pharoS-vm rasp. So 3 week ago I extracted the code of Doug from the CogVM repository, I install it on my own jenkins. But nothing is integrated yet, except in my repository. Where also the OSProcess is currently tested. But no it is not in the latest pharos on raspberry. On 20 May 2014, at 17:43, Alexandre Bergel <alexandre.bergel(a)me.com> wrote: > Ah okay, this is an answer that I understand :-) > > We are not really good at promoting what we are doing. > For the the case of Rasbian, it seems not that difficult to have Phratch and Pharo installed per default, if there is Scratch and Squeak. > > Cheers, > Alexandre > -- > _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: > Alexandre Bergel http://www.bergel.eu > ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. > > > > On May 20, 2014, at 11:06 AM, ClÃ©ment Bera <bera.clement(a)gmail.com> wrote: > >> FFI for the raspberry pie was finished for the Pharo vm 3 weeks ago. >> >> So I guess the Phratch team has not found the time yet to do that, but it should be possible. >> > > Best Regards Jean Baptiste Arnaud jbaptiste.arnaud(a)gmail.com

May 20, 2014

Re: [Pharo-dev] Pharo contribution plot plugin update

by Christophe Demarey

Done! Le 20 mai 2014 Ã 16:55, Yuriy Tymchuk a Ã©crit : > Hi, > > I donât have access to jenkins config, but it looks like the Plot Plugin[1] is not latest version. Can someone please update because they added support for matrix jobs. > > Uko > > > [1] https://wiki.jenkins-ci.org/display/JENKINS/Plot+Plugin

May 20, 2014

Re: [Pharo-dev] Pharo in Rasbian ?

by Alexandre Bergel

Ah okay, this is an answer that I understand :-) We are not really good at promoting what we are doing. For the the case of Rasbian, it seems not that difficult to have Phratch and Pharo installed per default, if there is Scratch and Squeak. Cheers, Alexandre -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. On May 20, 2014, at 11:06 AM, ClÃ©ment Bera <bera.clement(a)gmail.com> wrote: > FFI for the raspberry pie was finished for the Pharo vm 3 weeks ago. > > So I guess the Phratch team has not found the time yet to do that, but it should be possible. >

May 20, 2014

Re: [Pharo-dev] Pharo in Rasbian ?

by Alexandre Bergel

Hi! My point was the following: why Phratch is not included in the default setting of Rasbian? Alexandre -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. On May 20, 2014, at 9:36 AM, jannik laval <jannik.laval(a)gmail.com> wrote: > Hi, > > Probably he does not know phratch for Rasberry-Pi: https://ci.inria.fr/pharo-contribution/view/Phratch/job/Phratch-OneClick-RP… > > Cheers :) > > > 2014-05-20 15:32 GMT+02:00 Alexandre Bergel <alexandre.bergel(a)me.com>: > Hi! > > A friend of mine recently bought a Raspberry pi and installed Rasbian, a Debian-like OS for Raspberry. Squeak and Scratch are installed per default. There is room to fill here... > > <image001.png> > > Cheers, > Alexandre > -- > _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: > Alexandre Bergel http://www.bergel.eu > ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. > > > > > > > -- > ~~Jannik Laval~~ > Ãcole des Mines de Douai > Enseignant-chercheur > http://www.jannik-laval.eu > http://www.phratch.com > http://car.mines-douai.fr/ >

May 20, 2014

Re: [Pharo-dev] Pharo in Rasbian ?

by Juan

Clement I think, ffi can enable access to GPIO via a plugin, slope is then the job of making this plugin right? best jmdc On Tue, May 20, 2014 at 12:06 PM, ClÃ©ment Bera <bera.clement(a)gmail.com>wrote: > 2014-05-20 16:23 GMT+02:00 Juan <smalltalker.marcelo(a)gmail.com>: > > Jannik >> >> >> the phratch proyect provides access to GPIO port? >> ffi to achieve such access is available? >> any ideas? >> > > FFI for the raspberry pie was finished for the Pharo vm 3 weeks ago. > > So I guess the Phratch team has not found the time yet to do that, but it > should be possible. > > >> thanks in advance >> best >> >> jmdc >> >> >> On Tue, May 20, 2014 at 10:36 AM, jannik laval <jannik.laval(a)gmail.com>wrote: >> >>> Hi, >>> >>> Probably he does not know phratch for Rasberry-Pi: >>> https://ci.inria.fr/pharo-contribution/view/Phratch/job/Phratch-OneClick-RP… >>> >>> Cheers :) >>> >>> >>> 2014-05-20 15:32 GMT+02:00 Alexandre Bergel <alexandre.bergel(a)me.com>: >>> >>> Hi! >>>> >>>> A friend of mine recently bought a Raspberry pi and installed Rasbian, >>>> a Debian-like OS for Raspberry. Squeak and Scratch are installed per >>>> default. There is room to fill here... >>>> >>>> >>>> Cheers, >>>> Alexandre >>>> -- >>>> _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: >>>> Alexandre Bergel http://www.bergel.eu >>>> ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. >>>> >>>> >>>> >>>> >>> >>> >>> -- >>> >>> ~~Jannik Laval~~ >>> Ãcole des Mines de Douai >>> Enseignant-chercheur >>> http://www.jannik-laval.eu >>> http://www.phratch.com >>> http://car.mines-douai.fr/ >>> >> >> >

May 20, 2014

Re: [Pharo-dev] Mustache

by Esteban A. Maringolo

Moustache is, supposedly, heavy used by Twitter itself. Not with its JS version, but with its Java implementation. So the project is not dead. Although it probably was created as a hipster project in its beginning. Esteban A. Maringolo 2014-05-20 12:12 GMT-03:00 Paul DeBruicker <pdebruic(a)gmail.com>: > Well if you get a few minutes and feel like doing something send a pull > request with the changes to their github pages site you'd like to see. > Makes it easy on them. > > > > > > > NorbertHartl wrote >> I tried that already. But as with most hipster projects nobody feels >> responsible anymore. I contacted the original author but I he has nothing >> to do anymore with it. I tried to track it down (because besides a cool >> ascii art picture there is no contact data on the site) und even found I >> guy I know from berlin but he didnât respond. So I decided I have better >> things to do then to run after people which donât care about their >> projectâ¦ >> >> Norbert >> >> Am 20.05.2014 um 15:06 schrieb Torsten Bergmann < > >> astares@ > >> >: >> >>> Hi Norbert, >>> >>> http://mustache.github.io/ does not mention the port for Pharo Smalltalk. >>> >>> Maybe you should contact them to add a link to >>> http://smalltalkhub.com/#!/~NorbertHartl/Mustache. >>> >>> Such links can help getting more visibility. >>> >>> Thx >>> T. > > > > > > -- > View this message in context: http://forum.world.st/Mustache-tp4759684p4759709.html > Sent from the Pharo Smalltalk Developers mailing list archive at Nabble.com. >

May 20, 2014

Re: [Pharo-dev] Mustache

by Paul DeBruicker

Well if you get a few minutes and feel like doing something send a pull request with the changes to their github pages site you'd like to see. Makes it easy on them. NorbertHartl wrote > I tried that already. But as with most hipster projects nobody feels > responsible anymore. I contacted the original author but I he has nothing > to do anymore with it. I tried to track it down (because besides a cool > ascii art picture there is no contact data on the site) und even found I > guy I know from berlin but he didnât respond. So I decided I have better > things to do then to run after people which donât care about their > projectâ¦ > > Norbert > > Am 20.05.2014 um 15:06 schrieb Torsten Bergmann < > astares@ > >: > >> Hi Norbert, >> >> http://mustache.github.io/ does not mention the port for Pharo Smalltalk. >> >> Maybe you should contact them to add a link to >> http://smalltalkhub.com/#!/~NorbertHartl/Mustache. >> >> Such links can help getting more visibility. >> >> Thx >> T. -- View this message in context: http://forum.world.st/Mustache-tp4759684p4759709.html Sent from the Pharo Smalltalk Developers mailing list archive at Nabble.com.

May 20, 2014

Re: [Pharo-dev] Pharo in Rasbian ?

by ClÃ©ment Bera

2014-05-20 16:23 GMT+02:00 Juan <smalltalker.marcelo(a)gmail.com>: > Jannik > > > the phratch proyect provides access to GPIO port? > ffi to achieve such access is available? > any ideas? > FFI for the raspberry pie was finished for the Pharo vm 3 weeks ago. So I guess the Phratch team has not found the time yet to do that, but it should be possible. > thanks in advance > best > > jmdc > > > On Tue, May 20, 2014 at 10:36 AM, jannik laval <jannik.laval(a)gmail.com>wrote: > >> Hi, >> >> Probably he does not know phratch for Rasberry-Pi: >> https://ci.inria.fr/pharo-contribution/view/Phratch/job/Phratch-OneClick-RP… >> >> Cheers :) >> >> >> 2014-05-20 15:32 GMT+02:00 Alexandre Bergel <alexandre.bergel(a)me.com>: >> >> Hi! >>> >>> A friend of mine recently bought a Raspberry pi and installed Rasbian, a >>> Debian-like OS for Raspberry. Squeak and Scratch are installed per default. >>> There is room to fill here... >>> >>> >>> Cheers, >>> Alexandre >>> -- >>> _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: >>> Alexandre Bergel http://www.bergel.eu >>> ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. >>> >>> >>> >>> >> >> >> -- >> >> ~~Jannik Laval~~ >> Ãcole des Mines de Douai >> Enseignant-chercheur >> http://www.jannik-laval.eu >> http://www.phratch.com >> http://car.mines-douai.fr/ >> > >

May 20, 2014