March 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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Recommendation for password encryption?
by Mariano Martinez Peck Sept. 30, 2022

Sept. 30, 2022

Hi guys. Some time ago I asked about the best way to encrypt a password. Some of the recommendations I got was: 1) Generally for passwords you do not write a decrypt method for security purposes (eg you do not want people to be able to reverse engineer the encrypted password easily) 2) put a little salt 3) There is http://www.squeaksource.com/Cryptography/PasswordHashingFFI 4) I should not decrypt password but instead I should compare both encrypted versions to see if they are equal. My scenario is the following. I need to store database passwords in text files. So I don't want to let them as plain text. And while I understand 4), I think it's a different scenario than mine. I know that some database driver may allow you to directly send the encrypted password. But still...I have another similar scenario in which I have to store a password and then send it (unencrypted)...so I kind of really need a bi-directional encryption. Now..I would try to avoid having an external library + FFI. Any ideas what is the best thing I can do? And how could I solve 1) if I want bidirectional like in my case? Thanks in advance, -- Mariano http://marianopeck.wordpress.com

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ESUG 2022 call for presentations & Call for student volunteers
by stephane ducasse April 23, 2022

April 23, 2022

ESUG 2022 Novisad Serbia 22. â 26.8. https://esug.github.io/2022-Conference/call2022.html You can support the ESUG conference in many different ways: Sponsor the conference. New sponsoring packages are described at http://www.esug.org/supportesug/becomeasponsor/ <http://www.esug.org/supportesug/becomeasponsor/> Submit a talk, a software or a paper to one of the events. See below. Attend the conference. We'd like to beat the previous record of attendance (170 people at Amsterdam 2008)! Students can get free registration and hosting if they enroll into the the Student Volunteers program. See below. <>Developers Forum: International Smalltalk Developers Conference We are looking for YOUR experience on using Smalltalk. You will have 30 min for presentations and 45 min for hands-on tutorials. The list of topics for the normal talks and tutorials includes, but is not limited to the following: XP practices, Development tools, Experience reports Model driven development, Web development, Team management Meta-Modeling, Security, New libraries & frameworks Educational material, Embedded systems and robotics SOA and Web services, Interaction with other programming languages <>Teaching Pearls and Show us Your Business New this year!!! We added two types of sessions in addition to the regular talks and show us your projects sessions. Show your business 10 min session (Get prepared!!) Teaching pearls : we want some session on how to teach some design aspects. We want your tip and tricks to teach Smalltalk or OOP. We expect to have several 10 to 15 min sessions aggregated. <>How to submit? Make a Pull Request here https://github.com/ESUG/esug.github.io/tree/source/2022-Conference/talks Or but only if you are not connected to the worldâ¦ send an email to stephane.ducasse(a)inria.fr Title: [ESUG 2022] Please follow the template below the email will be automatically processed! Name: Email: Abstract: Bio: Call for Student Volunteers Student volunteers help keep the conference running smoothly; in return, they have free accommodations, while still having most of the time to enjoy the conference. Pay attention: the places are limited so do not wait till the last minute to apply. Conference details: Send an email to stephane.ducasse at inria.fr and serge.stinckwich at gmail.com with: title: [ESUG 2022 Student] name, gender, university/school, country, email address short description of you and why you are interested in participating For which period is accommodation covered? Accommodation is covered from Sunday 21 August until Friday 26 August 2022 (including nights from Sunday to Monday and from Thursday to Friday). Students will be hosted in student rooms. ESUG additionally covers for the lunches during the week and one dinner. Duties include handling registration as people arrive at the conference, filling coffee machines, collecting presentation slides for ESUG right after the presentation is given, being present at an information desk to answer questions, and generally being helpful. Student volunteering makes the conference better, takes a fairly small amount of time and doesn't significantly interfere with enjoying and learning from the conference. Please Note, this role requires discipline and constant attention to all attendees. Information about hotel Student Volunteer rooms are booked at (to be announced). If you are student volunteer, do not book yourself, we have arranged the booking already!

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any ideas why we need to have Point >> bitShiftPoint: bits?
by stephane ducasse March 29, 2022

March 29, 2022

Point >> bitShiftPoint: bits x := x bitShift: bits. y := y bitShift: bits S

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Re: [Esug-list] [PDFtalk] Porting to non-namespace Smalltalks
by stephane ducasse March 26, 2022

March 26, 2022

Hi guys > > I started to port Values to Pharo. > If you want to give an hand my current effort is here. > > https://github.com/Ducasse/PharoValues <https://github.com/Ducasse/PharoValues> > > should migrate license and other stuff too. > > S > >> On 1 Mar 2022, at 19:08, christian.haider(a)smalltalked-visuals.com <mailto:christian.haider@smalltalked-visuals.com> wrote: >> >> Hi all, >> >> PDFtalk is a PDF library for VisualWorks[1]. The library has been ported successfully to Gemstone[2]. >> Now, there is interest from companies in a port to Squeak and VA Smalltalk. >> >> The project[3] has started and we are making good progress. >> The first step: porting the Values package. >> This is easy, because there are no namespace issues. >> >> The next step is to implement class renamings so that namespaced classes can be renamed to global prefixed names. >> >> Then PDFtalk with all its components, except for the UI, can be ported. >> >> The porting approach is different to the traditional way of loading and fixing. >> The import files for other Smalltalks are generated from VisualWorks where the code is transformed by declarative rules. >> The approach is documented in [4]. >> >> I set up a GitHub organization for this project[5]. There, the fileouts for each dialect are published (Gemstone, Squeak and VA Smalltalk so far), so that people without VisualWorks can work with the code in their Smalltalk. >> >> Also, I record and explain all steps of the porting process for Squeak in great detail[6], so that people can follow it. >> >> I would like to invite Smalltalkers from all dialects to take part in this project. >> The code transformations for Squeak will be quite similar to the ones needed for Pharo and Cuis. >> Therefore, each port to one Smalltalk will help the port to other Smalltalks. >> >> Any takers? >> >> Happy hacking, >> Christian >> >> >> [1] https://wiki.pdftalk.de/doku.php?id=start <https://wiki.pdftalk.de/doku.php?id=start> >> [2] https://wiki.pdftalk.de/doku.php?id=pdftalk4gemstone <https://wiki.pdftalk.de/doku.php?id=pdftalk4gemstone> >> [3] https://wiki.pdftalk.de/doku.php?id=pdftalknonnamespacefileout <https://wiki.pdftalk.de/doku.php?id=pdftalknonnamespacefileout> >> [4] https://wiki.pdftalk.de/doku.php?id=smalltalktransform <https://wiki.pdftalk.de/doku.php?id=smalltalktransform> >> [5] https://github.com/PortingPDFtalk <https://github.com/PortingPDFtalk> >> [6] https://wiki.pdftalk.de/doku.php?id=valuesportinglog <https://wiki.pdftalk.de/doku.php?id=valuesportinglog>_______________________________________________ >> Esug-list mailing list -- esug-list(a)lists.esug.org <mailto:esug-list@lists.esug.org> >> To unsubscribe send an email to esug-list-leave(a)lists.esug.org <mailto:esug-list-leave@lists.esug.org> > >

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Default selection when compiling a method
by pmissech March 25, 2022

March 25, 2022

Hello, We have worked today with Iona on https://github.com/pharo-project/pharo/issues/11052. Basically the hierarchy is reversed by default, which we don't like. We proposed a PR to change the default behavior. The issue we want to share with you today is the following. You select a method that is installed in a class different from your current class in the Calyspo browser. You want to change it. Upon compiling your changes, Calypso asks for where the method should be installed. We are wondering whether we should have a default selection in the Class list. Two cases that we thought of: (1) When selecting a subclassResponsibility, We would like to pre select the current class to install the new method. (2) When selecting a random method from the hierarchy, we tend to think that the class in which the method is implemented should be selected by default. Â Â Â When working on your own projects, this makes sense to us. Â Â Â When navigating through other projects/core packages, it would make less sense. We tend to think that we should select the current class every time. (basically case (1)) But what do you think ? Have a nice day Pierre & Iona

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This week (12/2022) on the Pharo Issue Tracker MD Marcus Denker
by Marcus Denker March 25, 2022

March 25, 2022

We merged 15 PRs and closed 14 issues this week. Fixes ===== - fix row background color loss when hovering a table with alternated color configured #11020 https://github.com/pharo-project/pharo/pull/11020 - Fix Cmd-t again #11022 https://github.com/pharo-project/pharo/pull/11022 - this change enables click + control, and click + alt in morphic #11032 https://github.com/pharo-project/pharo/pull/11032 - 11007 isPrime does not work for large numbers #11030 https://github.com/pharo-project/pharo/pull/11030 - Fix for specific failure of isPrime for certain squares introduced byâ¦ #11047 https://github.com/pharo-project/pharo/pull/11047 - use fixed spec version (for release) #11014 https://github.com/pharo-project/pharo/pull/11014 - Change UserInterrupt detection to use character codes rather than scaâ¦ #11004 https://github.com/pharo-project/pharo/pull/11004 Documentation ============= - ClassDefinitionPrinter-Comments #11005 https://github.com/pharo-project/pharo/pull/11005 Speed ===== - 11018 SmallInteger isPrime is inefficient #11043 https://github.com/pharo-project/pharo/pull/11043 Cleanup ======= - Renamed protocol name from accesing to accessing #10967 https://github.com/pharo-project/pharo/pull/10967 - Align a few categories in Zinc with the rest of system #11029 https://github.com/pharo-project/pharo/pull/11029 - Cleanup: protocol "activating" -> "activation" #11034 https://github.com/pharo-project/pharo/pull/11034 - Cleanup: protocol "activation hooks" -> "activation - hooks" #11036 https://github.com/pharo-project/pharo/pull/11036 - Cleanup: align protocols in UITheme #11040 https://github.com/pharo-project/pharo/pull/11040 - Cleanup waiting protocols in Monitor #11042 https://github.com/pharo-project/pharo/pull/11042 Pharo9 ====== - Backport Fix #11001: Stateful Traits: Adding One Corrupts Existing Instances #11016 https://github.com/pharo-project/pharo/pull/11016

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Positions at lifeware :)
by stephane ducasse March 21, 2022

March 21, 2022

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Extension Traits/Slots
by sean＠clipperadams.com March 19, 2022

March 19, 2022

Has this ever been considered? We can add methods from a package different than the host class and thereby avoid dirtying its package, but what if we could do the same for traits and slots?

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Stateful Traits: Adding One Corrupts Existing Instances
by sean＠clipperadams.com March 18, 2022

March 18, 2022

This is a bad one. Can someone have a look? Anyone I should tag on the issue? https://github.com/pharo-project/pharo/issues/11001

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