April 2017 - Pharo-users - lists.pharo.org

why is adding instance variables so slow?
by Peter Uhnak April 16, 2017

April 16, 2017

Hi, does anyone know why adding instance variables is so slow? I did some quick benchmarks (see below), resulting in more than order of magnitude speed difference between having it in the class definition and adding it later. In fact it is still much faster to delete the class and then recreate it with the instance variables in the d efinition. For four arguments it is till 8x faster to delete the class four times and recreate it then just add the variable. Unfortunately I cannot just trash the classes (they have methods and inheritance). So the question is: why is it so slow? can I somehow improve the performance? Thanks, Peter Benchmarks: [ cls := Object subclass: #Some1. cls removeFromSystem. ] bench. "'91 per second'" [ cls := Object subclass: #Some2 instanceVariableNames: 'variable'. cls removeFromSystem ] bench. "'90 per second'" [ cls := Object subclass: #Some3. cls addInstVarNamed: 'variable'. cls removeFromSystem. ] bench. "'7 per second'" [ cls := Object subclass: #Some4. cls removeFromSystem. cls := Object subclass: #Some4 instanceVariableNames: 'variable'. cls removeFromSystem. ] bench. "'43 per second'" [ cls := Object subclass: #Some3. cls addInstVarNamed: 'variable1'. cls addInstVarNamed: 'variable2'. cls addInstVarNamed: 'variable3'. cls addInstVarNamed: 'variable4'. cls removeFromSystem. ] bench. "'2 per second'" [ cls := Object subclass: #Some4. cls removeFromSystem. cls := Object subclass: #Some4 instanceVariableNames: 'variable1 variable2 variable3 variable4'. cls removeFromSystem. ] bench. "'44 per second'" [ cls := Object subclass: #Some5. cls removeFromSystem. cls := Object subclass: #Some5 instanceVariableNames: 'variable1'. cls removeFromSystem. cls := Object subclass: #Some5 instanceVariableNames: 'variable1 variable2'. cls removeFromSystem. cls := Object subclass: #Some5 instanceVariableNames: 'variable1 variable2 variable3'. cls removeFromSystem. cls := Object subclass: #Some5 instanceVariableNames: 'variable1 variable2 variable3 variable4'. cls removeFromSystem. ] bench. "'17.269 per second'"

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Pharo 6.0 On windows crash while trying to run AthensFlakeDemo
by Ricardo Pacheco April 16, 2017

April 16, 2017

I have been trying to run the AthensFlakeDemo in Pharo 6, updated as of today, in Windows 10 using this command: AthensFlakeDemo new openInWorld. Every time I run it, Pharo crashes. It looks to me like a bug, but before reporting a bug I want to ask you if I need to install/do something else prior to trying to run this demo. Thanks -- View this message in context: http://forum.world.st/Pharo-6-0-On-windows-crash-while-trying-to-run-Athens… Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

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Pharo6 ombu-session files in pharo-local
by Holger Freyther April 15, 2017

April 15, 2017

Hi, as part of moving a test image from Pharo5 to Pharo6 I also noticed that on each start a new "ombu-session" folder will be created (and never cleaned up). For a server-side deployment this is quite unfortunate as I want/need to use a fixed amount of disk space. I think Norbert has similar concerns with this feature. We are using "image-launch" to run the image and then either systemd|monit|runit|kubernetes will execute (and re-execute) image-launch. So potentially many many folders are created and never used. On deployments with many images, it is rare to make online changes and even more rare to try to recover them. Would it be possible to create the underlying storage or disable it completely? thank you holger

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Traits score: Squeak: 1, Pharo5: 0
by Hilaire April 15, 2017

April 15, 2017

So it looks like Squeak[1] is capable to produce a correct .mcz file, out of a package coming with Traits and class. By correct, read the Traits logic is not lost. Hilaire [1] I tested with a Squeak6 alpha waiting somewhere on my disk -- Dr. Geo http://drgeo.eu

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Re: [Pharo-users] Export MongoDB to sql format
by Esteban Lorenzano April 14, 2017

April 14, 2017

> On 13 Apr 2017, at 19:26, Asbath Sama biyalou via Pharo-users <pharo-users(a)lists.pharo.org> wrote: > > > From: Asbath Sama biyalou <asamabiyalou(a)yahoo.com> > Subject: Export MongoDB to sql format > Date: 13 April 2017 at 19:26:25 GMT+2 > To: Pharo users users <pharo-users(a)lists.pharo.org> > > > Hello Everyone. > > I think this is not the right place for this question. But I am doing a > work with Pharo. > > I use MongoDB with Voyage. But I am asked to export my database in sql > format. > > I want to know if there is a way to export mongoDB in sql. there is not. a nosql database will have problems to export its data as sql. of course it can be done (as everything), but it is a manual task :S cheers, Esteban > > > Thanks. > > > Asbath > > > >

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Methods & Classes using the command line.
by nacho April 13, 2017

April 13, 2017

Hi pharoers, If I do the following in a minimal Pharo image, using the command line: ./Pharo --headless Pharo.image eval "Object subclass: #TestClass instanceVariableNames: 'one' classVariableNames: '' package: 'IS-Test'." I get the class created. However, if I try to pass the following argument to eval: "Object subclass: #TestClass instanceVariableNames: 'one' classVariableNames: '' package: 'IS-Test'. TestClass compile:'one ^one' classified: 'accessor'." I get an UndefinedObject>>DoIt (TestClass is Undeclared). At first I thought it could be that it takes sometime to compile the class, so added some delay: "Object subclass: #TestClass instanceVariableNames: 'one' classVariableNames: '' package: 'IS-Test'. (Delay forSeconds: 5) wait. TestClass compile:'one ^one' classified: 'accessor'." But again: UndefinedObject>>DoIt (TestClass is Undeclared). I even tried to do: "Object subclass: #TestClass instanceVariableNames: 'one' classVariableNames: '' package: 'IS-Test'. Smalltalk saveAndQuit." and after that add only a method by passing: "TestClass compile:'one ^one' classified: 'accessor'. Smalltalk saveAndQuit." But again: UndefinedObject>>DoIt (TestClass is Undeclared) How do I add a method to a class using the command line? Thanks in advance Nacho ----- Nacho Smalltalker apprentice. Buenos Aires, Argentina. -- View this message in context: http://forum.world.st/Methods-Classes-using-the-command-line-tp4941977.html Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

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Machine Learning in Pharo
by frankl1_miky April 13, 2017

April 13, 2017

Hello everyone, I would like to experiment machine learning in Pharo. Is there any library out there for that purpose ? Thanks ! -- View this message in context: http://forum.world.st/Machine-Learning-in-Pharo-tp4941934.html Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

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Export MongoDB to sql format
by Asbath Sama biyalou April 13, 2017

April 13, 2017

Hello Everyone. I think this is not the right place for this question. But I am doing a work with Pharo. I use MongoDB with Voyage. But I am asked to export my database in sql format. I want to know if there is a way to export mongoDB in sql. Thanks. Asbath

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Recommended stable Pharo 5.0 VM for Linux users?
by Luke Gorrie April 12, 2017

April 12, 2017

Questions! Where can I find the source code for the latest stable Linux/unix VM for Pharo 5.0? I want to package it for a Linux distribution (NixOS). Currently I am confused: The release tarballs at http://files.pharo.org/vm/src/vm-unix-sources/blessed show the latest non-Spur version being 2016-02-18. The github repo at https://github.com/pharo-project/pharo-vm has a tag Pharo50-stable on commit b8ec25a which dates from 2016-05-04. (Is this tag immutable or does it move around?) The URL for downloading binaries (get.pharo.org/vm50) does not seem to say anywhere what version it is downloading, and it was not obvious to me from downloading the binary and inspecting it with 'strings' either (it's not for my distro so I can't just run it with '--version'). Help would be appreciated! Great if somebody could also tell me under what circumstances the spur VM is preferred to the non-spur VM.

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[ann] steering agile architecture video published by o'reilly
by Tudor Girba April 12, 2017

April 12, 2017

Hi, I am happy to announce that OâReilly has published my Steering Agile Architecture video training: http://www.humane-assessment.com/blog/steering-agile-architecture-video-tra… This video is based on my work on humane assessment, and it features Moose prominently. It also shows Pharo, GT and Roassal (in the last part). The video is indeed paid and it is mainly targeted to people that have a Safari Books Online subscription. But, the interesting thing about it is that it opens Pharo and Moose to a new kind of an audience, OâReilly being the most prominent publishing company in the software area. Agile architecture is considered a prominent topic but the literature (until now) was rather loose at how to make it really work in practice. This course offers both a concrete approach based on humane assessment. As you might know, humane assessment centers around the idea of building tools cheaply as a way to figure the system out, and this is right now pretty much only practicable in Moose and Pharo. One thing that I ask people when I go to conferences, the last one being the Software Architecture Conference organized by OâReilly, is if they like working with legacy systems. They actively dislike it. Then I show them demos of how it can be like and then I ask them if they think these demos are cool. And I never encountered one that did not find it cool. So, in a way, we can now be quite confident in saying that we work on the single platform that makes working with an existing system cool. Not a small feat. So, if you do get the chance to look at these things, you might also get a concrete inspiration of how to leverage Pharo skills within companies that do not yet work with Pharo. Cheers, Doru -- www.tudorgirba.com www.feenk.com "Presenting is storytelling."

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