October 2022 - Pharo-dev - lists.pharo.org

Sockets not working under heavy VM load?
by Pavel Krivanek Oct. 3, 2023

Oct. 3, 2023

Hi, we have some performance issues with Glorp over P3 and, after some investigation, I have a theory that could explain it. And I would like to know your opinion if it is correct. To reproduce this issue, you can try something easy. Just create a process with normal or higher priority that will try to read something from a socket. And, in parallel, do in a separate thread an operation that takes all the processor time for several seconds. ```` [ 5 seconds wait. Time now traceCr. ZnClient new url: 'https://www.google.com'; get. Time now traceCr. ] forkAt: 60. [1000 timesRepeat: [ 10000 factorial ] ] timeToRun ```` (you may try a different safe server address) The processes run in parallel until the time when the first process tries to obtain data from the socket. Then it hangs and waits until finishing of the second process. My theory is that the VM socket plugin is able to receive incoming data from the connection and save it into the buffer. In the meantime, the reading process is waiting on the socket semaphore. But it looks like the plugin is not able to release the semaphore while the VM is actually doing something. It needs to wait until the VM has nothing useful to do, and then it is finally able to release the semaphores so Pharo processes are resumed and can start to read. Is my theory right? Cheers, -- Pavel

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Inovation Technology Award Submission: Polyphemus
by pmissech Dec. 27, 2022

Dec. 27, 2022

Hello, Although i will not be able to attend ESUG'22, a friend agreed to present one of our projects to the innovation award. **Polyphemus** is aÂ VM related, but public aims at any kind of developers. Particularly, the video submission talks about how to look at an image and how to **recover** dead images. Feel free to contact me if you have any questions ! Enjoy (and vote for Polyphemus!). 5 minutes video, Innovation Technology Award submission: https://youtu.be/zf3cCtNW830 Repository: github.com/hogoww/Polyphemus/ Additionnal information on image recovery: https://github.com/hogoww/Polyphemus/blob/main/Documentation/ResurrectingDe… Cheers !

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Digital Twin applied to Software
by Aik-Siong Koh Nov. 30, 2022

Nov. 30, 2022

Hi: I have a novel idea "Digital Twin applied to Software". See attached slides. It points to the future of improved programming productivity and reliability. Let me know what you think. Thanks, Aik-Siong Koh http://ar-cad.com Abstract Digital Twin applied to Software Aik-Siong Koh askoh.com There has been a major dichotomy in computing right from the beginning: Statically Typed vs Dynamically Typed programming languages. The former languages produce fast executables but are inflexible to program. The latter are just the converse. This dichotomy has been frustrating to programmers who always feel they have to make sacrifices when making a choice. It also often leads to futile language wars. The Digital Twin concept was introduced in engineering where a physical system is modeled digitally in geometry, simulation and other information. The concept has proven so successful that it is being applied to almost everything in engineering from simple mouse traps to complex whole cities. It occurred to the author that this concept can be extended to software too. For example, execution in C++ is famously fast. But development in C++ is notoriously difficulty because of language complexity and long build times. A flexible digital twin can be a program written in Smalltalk which is famous for live programming. "Development at the speed of thought" is the motto and is real. What is gained by this duplication? Firstly, the flexible twin can be use to explore new algorithms, features, solutions and fix bugs quickly. Only desired codes are translated to C++ manually or automatically. Secondly, the two programs can check each other so that bugs are reduced significantly. These two gains will define future programming productivity and quality. The Digital Twin concept will also drive the automatic translation of the flexible language to the fast language. Bio Dr Aik-Siong Koh has a PhD from The University of Texas at Austin where he programed in FORTRAN to simulation mechanical systems. While teaching at Texas Tech University and Nanyang Technological University, he developed interest in Multibody Dynamics. To develop his own Multibody Dynamics simulator, he researched for the most productive programming language and discovered Smalltalk. The live programming capabilities of Smalltalk permitted him to build a successful simulator which he then proceeded to commercialize. His later experience with C++ at Mechanical Dynamics and MathWorks gave him the idea of Digital Twin for Software.

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This week (43/2022) on the Pharo Issue Tracker
by Marcus Denker Oct. 28, 2022

Oct. 28, 2022

This week (43/2022) on the Pharo Issue Tracker We merged 8 PRs this week: Features ======== - Add a shortcut to extract method refactoring #11814 https://github.com/pharo-project/pharo/pull/11814 - Adding removeKey:ifAbsent: #11821 https://github.com/pharo-project/pharo/pull/11821 - add Collection>>atRandom:weighting: and cie and tests #11829 https://github.com/pharo-project/pharo/pull/11829 Fixes ======== - Fix : missing isScripting method in LessonView #11815 https://github.com/pharo-project/pharo/pull/11815 - made rename method refactor "Spec2 compliant" #11826 https://github.com/pharo-project/pharo/pull/11826 - Cleanup-asCollectionElement-ChunkFileFormatParser #11827 https://github.com/pharo-project/pharo/pull/11827 - Bugfix: Browse class from Meta inspector pane #425 https://github.com/pharo-spec/NewTools/pull/425 Pharo10 ======= - Pharo10: 6191 find between substrings freezes the image #11770 https://github.com/pharo-project/pharo/pull/11770

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Looking for an engineer position to work on Virtual Machines
by Pierre Misse-Chanabier Oct. 25, 2022

Oct. 25, 2022

Hello, My name is Pierre Misse-Chanabier. I'm finishing my PhD in the RMOD team on testing Virtual Machines in about two months. I am therefore looking for a Job, hopefully in the Pharo community ! Ideally, I'm looking to work in the domains of Virtual Machines or Language Tooling, or Meta-programing, but I'm open to other opportunities. See my CV attached. I have to stay in Lille for at least the next year, therefore, I am looking to work remotely. Here are my most important projects and publications about them: Illicium : a framework to generate C code from Pharo code. Github repository: [ https://github.com/hogoww/Illicium | https://github.com/hogoww/Illicium ] IWST'19 Illicium: A modular transpilation toolchain from Pharo to C [ https://hal.archives-ouvertes.fr/hal-02297860/ | https://hal.archives-ouvertes.fr/hal-02297860/ ] version poster SAC'22 & full ICSR'22: Differential testing of simulation-based VM generators: automatic detection of VM generator semantic gaps between simulation and generated VMs [ https://link.springer.com/chapter/10.1007/978-3-031-08129-3_7 | https://link.springer.com/chapter/10.1007/978-3-031-08129-3_7 ] [ https://dl.acm.org/doi/abs/10.1145/3477314.3507171 | https://dl.acm.org/doi/abs/10.1145/3477314.3507171 ] Polyphemus: Retro engineering of the Pharo Image, and ease of VM tooling Github Repository: [ https://github.com/hogoww/Polyphemus/ | https://github.com/hogoww/Polyphemus/ ] Video Presentation for Esug Innovation award (I was unable to present it myself): [ https://www.youtube.com/watch?v=zf3cCtNW830 | https://www.youtube.com/watch?v=zf3cCtNW830 ] VMIL'22: Ease VM Level Tooling with Language Level Ordinary Object Pointers [ https://hal.inria.fr/hal-03827632 | https://hal.inria.fr/hal-03827632 ] (preprint) I am particularly interested in my latest work: Polyphemus. I have also worked on many part of the Pharo ecosystem. The Pharo VM, The Pharo bootstrap, Calypso, Debugger, selector extraction, Iceberg scripting, SUnit ... Let me know if you have openings or questions ! Pierre

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This week (42/2022) on the Pharo Issue Tracker
by Marcus Denker Oct. 24, 2022

Oct. 24, 2022

This week (42/2022) on the Pharo Issue Tracker We merged 9 PRs this week Features ======= - Add a shortcut to extract method refactoring #11814 https://github.com/pharo-project/pharo/pull/11814 Fixes ===== - Fix : missing isScripting method in LessonView #11815 https://github.com/pharo-project/pharo/pull/11815 - Update comment to reflect refactoring actions #11778 https://github.com/pharo-project/pharo/pull/11778 - CI: when getting pharo version/prefix on PR, do not use --first-parent #11780 https://github.com/pharo-project/pharo/pull/11780 - Pharo11: 6191 find between substrings freezes the image #11771 https://github.com/pharo-project/pharo/pull/11771 Cleanups ======== - 11792-FFIConstantHandleTest-calls-deprecated-method-FFIExternalReferencehandle #11793 https://github.com/pharo-project/pharo/pull/11793 - moved the condition creation from the calypso package to the breakpoint #11807 https://github.com/pharo-project/pharo/pull/11807 Tests ===== - This adds an example and a test for Fluid Slot definitions #11786 https://github.com/pharo-project/pharo/pull/11786 Pharo10 ======= - Pharo10: CI: when getting pharo version/prefix on PR, do not use --first-parent #11785 https://github.com/pharo-project/pharo/pull/11785

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Sponsoring our new mooc
by stephane ducasse Oct. 24, 2022

Oct. 24, 2022

Since more than a year we have been working on a new mooc called: âAdvanced Object-oriented Design and Developmentâ It will be quite good. We are bullet proofing it with a new lecture here at Lille. It will not focus on Pharo but on object-oriented design, tests, design patterns. It will present - Test and test-driven - Essential aspects of OOP - Basic and universal principles - Double dispatch - Case studies in Pharo - Some design patterns - Some coding idioms and we will composed of 8 modules Currently it has around 50 lectures and we expect around 60 + exercises. You can access some drafts of the support here: https://rmod-files.lille.inria.fr/?dir=DesignCoffeeClub <https://rmod-files.lille.inria.fr/?dir=DesignCoffeeClub> The production cost of this mooc is around 200 K Euros financed by Inria and it will be filmed in January. We hope to deploy it in April or May 2023. The mooc will be produced in english (and may be dub in french). It occurred to me in this difficult time to find good developers that some of you may want to sponsor this mooc\to get exposure. You can be associated with some of the best OO teachers: me, Guillermo Polito and Pablo Tesone. We have cumulated more than 40 years of teaching experience. Several books... Yes at the end of the day we should sale a bit our expertise - check below our track record with the previous mooc. As a sponsor you will get your logo and links on all the supports: Slides and videos. Note that this mooc is designated to have a live time of 10 years or more. It is teaching fundamental points of OOP. So this is a unique opportunity to market your company to people wanted to learn advanced OOP Note that there are no other lectures like this one. We have two levels of sponsoring: 2000 Euros for platinum sponsor 1000 Euros for plain sponsor Let us know. Just a little reminder of the previous Mooc on Pharo. It has more than 8 years. For the record, some youtube videos (that we published after 4 years of running the pharo mooc) got more than 6000 views and this is by developers. We got around 10000 followers not counting the people watching the mooc on youtube and here are some of the testimonies we collected over the years. J'ai trouvÃ© Ã§a trÃ¨s intÃ©ressant, beaucoup plus que prÃ©vu ! je regrette de ne pas m'y Ãªtre mis plus tÃ´t. J'ai enfin l'impression de vraiment faire de la POO ! Ou Ã l'inverse je me rend que je n'en faisais pas vraiment... - Anonymous, 2019 I have just completed week seven of the Pharo Mooc (beginner and object oriented tracks) I am starting a redo of the Mooc with the web track (TinyBlog project). I have already learned so much ! I have spent the last 20 years or so in software development and, following this Mooc, I realized I hadnât really grasped the essence of object oriented design. - Anonymous Â« Really one of the best mooc I have ever attended. And I have attended quite a few (openSAP, openHPI). As an old fashioned ABAP developer I want to be reborn as Pharo developer in my next life :-) Â» - Anonymous Hi! I finished the MOOC some weeks ago and I would like to congratulate everybody involved! After a decade+ of Python programming I think I found my new favorite language :). I'm making a small Teapot server for Slack command bots, I'm goona push it to Github (yay Iceberg), if anyone is interested. - EduardoPadoan I just completed the @pharoproject Mooc the best investment I have ever made of my time. MAQBOOL Hey all - I've just finished the Mooc - thanks for an excellent course and a thouroughly interesting look at a new way to program :smile: Looking forward to starting to play with Pharo on some upcoming ideas I've had. - Tieryn As much as I thought I understand object-orientation, it is very clear NOW that without a truly useable Smalltalk, which Pharo is, it is impossible to really understand and exercise object-orientation. Thank you all soooo much. - Mike D. 06/12/2020 I finished the Pharo MOOC a few days ago. Thank you very much to Damien, Stephane, and Luc for their work on the material! I enjoyed it very much - Anonymous Hey all - I've just finished the Mooc - thanks for an excellent course and a thouroughly interesting look at a new way to program :smile: Looking forward to starting to play with Pharo on some upcoming ideas I've had ð3 - Anonymous I already had previous Smalltalk experience, but yes, I'm extremely happy Chapter 7 has been extremely fulfilling - Anonymous A general comment I wanted to make is that the MOOC so far has been great. Impressed with the quality and content, and grateful that it is available and free. Many thanks! - Aryeh IMHO the videos were very well done. I would even say shockingly well doneâ¦ for a bunch of programmers who are supposed to be clueless about design - SeanDeNigris - 10/26/2017 The more I learning about @pharoproject the more I appreciate it's beauty and simplicity, finally, object-oriented programming is done right - MAQBOOL Mooc absolument remarquable. Superbe voyage autour de Pharo. Le paradigme objet qui (re)prend enfin du sens ! - Anonymous - 01/03/2019

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About Bag API
by stephane ducasse Oct. 23, 2022

Oct. 23, 2022

Hi I wonder why I cannot get values of a entry using at: | aBag | aBag := Bag new. aBag addAll: âaabbbacacccaâ. aBag at: $a >>> 5 I have the impression that this is because Bag API never got the correct amount of love but may be Iâm wrong. What is your opinion? S

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This week (41/2022) on the Pharo Issue Tracker
by Marcus Denker Oct. 18, 2022

Oct. 18, 2022

Fixes ===== - CopyClassRefactoring copies class comment as well #11789 https://github.com/pharo-project/pharo/pull/11789 - add missing utf8StringFromCString methods #11791 https://github.com/pharo-project/pharo/pull/11791 - Fixed resolving desktop file location #11768 https://github.com/pharo-project/pharo/pull/11768 Features ======== - 11775 feature request adding breakpoint groups and break on count breakpoints #11776 https://github.com/pharo-project/pharo/pull/11776 - Multiline Executable Comments #11774 https://github.com/pharo-project/pharo/pull/11774 CI == - Odd PR builds use the the latest VM, else use the stable VM #11678 https://github.com/pharo-project/pharo/pull/11678 Tests ===== - Reflectivity: more tests for multiple links #11782 https://github.com/pharo-project/pharo/pull/11782 Cleanups ======== - simplify Closure>>#arguments by using #collect: #11772 https://github.com/pharo-project/pharo/pull/11772 - Syntactic check a single >>> on executable comments #11784 https://github.com/pharo-project/pharo/pull/11784 - Remove obsolete code in RBCondition https://github.com/pharo-project/pharo/pull/11767 - Categorize refactorings and transformations #11783 https://github.com/pharo-project/pharo/pull/11783 - Cleanup-ClassParser-CDClassDefinitionModel #11787 https://github.com/pharo-project/pharo/pull/11787 - Move RBReplacePreview to NautilusRefactoring #11765 https://github.com/pharo-project/pharo/pull/11765 Comments ======== - Add more executable comments for Collection #11683 https://github.com/pharo-project/pharo/pull/11683

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This week (40/2022) on the Pharo Issue Tracker
by Marcus Denker Oct. 10, 2022

Oct. 10, 2022

We merged 16 PRs this week: Fixes ===== - 11671-MetaLinks-on-methods-with-no-return-statement-implicit-self-are-called-twice #11759 https://github.com/pharo-project/pharo/pull/11759 - Fix "undo" operation erroneously removing the dirty flag when undo operation performed after saving #11655 https://github.com/pharo-project/pharo/pull/11655 - fix 11709: DTRFTPlugin class missing even though #11513 was merged #11736 https://github.com/pharo-project/pharo/pull/11736 - Remove unused refactor #11738 https://github.com/pharo-project/pharo/pull/11738 - Fix RefactoringChangeTests on fluid #11741 https://github.com/pharo-project/pharo/pull/11741 - Class definition popup uses the default class syntax (fluid with the new default) #11737 https://github.com/pharo-project/pharo/pull/11737 - Debugger selection messed up when using breakpoints in a block #11733 #11734 https://github.com/pharo-project/pharo/pull/11734 Features ======== - Add a browser tool to see package dependencies #11700 https://github.com/pharo-project/pharo/pull/11700 Speed ===== - Removing the reification of TFSameThreadCall #11739 https://github.com/pharo-project/pharo/pull/11739 Documentation ============= - Add executable comments on Collection for do: and stream related #11699 https://github.com/pharo-project/pharo/pull/11699 Cleanups ======== - Improve compiler plugin implementation for P11 #11761 https://github.com/pharo-project/pharo/pull/11761 - Rename AddClass refactoring/transformation to InsertClass and cleanup #11757 https://github.com/pharo-project/pharo/pull/11757 - 11753-Enhance-Breakpoint-API-with-enabled-method #11758 https://github.com/pharo-project/pharo/pull/11758 - Move nameToDisplay from Refactoring-Changes to Ring-Definitions-Core #11751 https://github.com/pharo-project/pharo/pull/11751 - Replace nested conditions with guard close #11754 https://github.com/pharo-project/pharo/pull/11754 - Refactoring engine small cleanup #11746 https://github.com/pharo-project/pharo/pull/11746

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