- Pharo-users - lists.pharo.org

Re: [Pharo-users] Library to use multi-core in Pharo?
by Ben Coman Jan. 10, 2019

Jan. 10, 2019

On Thu, 10 Jan 2019 at 00:19, Alexandre Bergel via Pharo-users < pharo-users(a)lists.pharo.org> wrote: > Hi! > > Is there an effort to easily use multi-core or native processes in Pharo? > I am thinking about a library that offer a construct like: > > future := Runner runInDifferentProcess: [ âThis block is run in a > different OS processâ ] > > That would save the image under a different name, use OSSubProcess to > launch a new Pharo with no UI. > > Is there a library available? > maybe not the full answer you were hoping for, but just you a side thought... One thing I've been curious about for a while is how the system might behave if via FFI you call fork() or clone(), and use Kilon's CPP Bridge [1] for return values. [1] https://github.com/kilon/CPP cheers -ben

1 0

Re: [Pharo-users] Library to use multi-core in Pharo?
by Pierce Ng Jan. 10, 2019

Jan. 10, 2019

On Wed, Jan 09, 2019 at 01:18:45PM -0300, Alexandre Bergel via Pharo-users wrote: > Is there an effort to easily use multi-core or native processes in Pharo? > I am thinking about a library that offer a construct like: There used to be a Hydra VM for Squeak: http://squeakvm.org/~sig/hydravm/devnotes.html >From the developer notes: A HydraVM encapsulates full interpreter state in single object. This allowing it to support as many as needed interpreter instances to be run using different native threads. Most of VM functions (and all primitives) now require an additional argument - interpreter instance. Pierce

1 0

Re: [Pharo-users] [ANN] P3 version 1.1
by Tudor Girba Jan. 9, 2019

Jan. 9, 2019

Excellent. In the meantime, we extended GT4P3 a bit to also navigate Schemas and Tables' structure. For this, I introduced a few classes such as Database, Schema or Table to ease the inspection and tool creation. Itâs a bit naive for now, but it works quite well. Should these be committed to the P3 directly to enable an object-oriented API for drilling through the DB? Cheers, Doru > On Jan 6, 2019, at 9:17 PM, Sven Van Caekenberghe via Pharo-users <pharo-users(a)lists.pharo.org> wrote: > > > From: Sven Van Caekenberghe <sven(a)stfx.eu> > Subject: Re: [Pharo-users] [ANN] P3 version 1.1 > Date: January 6, 2019 at 9:17:34 PM GMT+1 > To: Any question about pharo is welcome <pharo-users(a)lists.pharo.org> > > > Nice, I just added convenience methods #listDatabases #listSchemas and #listTablesInSchema: to P3Client so you should be able to make a real browser, connection >> schemas >> tables >> contents (listDatabases is not so useful since you can only connect to 1 database at a time). > >> On 6 Jan 2019, at 00:01, Tudor Girba <tudor(a)tudorgirba.com> wrote: >> >> And with a little more code, we now have a dedicated Playground form snippet that opens the database connection without requiring any Pharo code. >> >> <gt4p3-snippet.png> >> >> Cheers, >> Doru >> >> >>> On Jan 5, 2019, at 12:02 AM, Tudor Girba <tudor(a)tudorgirba.com> wrote: >>> >>> You can now query a Postgres database from the new GT. The initial code is available here: >>> https://github.com/feenkcom/gt4p3 >>> >>> It currently looks like this: >>> <gt-inspector-p3-query.png> >>> >>> Cheers, >>> Doru >>> >>> >>> >>>> On Dec 31, 2018, at 12:33 PM, Sven Van Caekenberghe <sven(a)stfx.eu> wrote: >>>> >>>> Hi, >>>> >>>> I created a new release of P3, the modern, lean and mean PostgreSQL client for Pharo. >>>> >>>> https://github.com/svenvc/P3 >>>> >>>> Version 1.1 contains the following changes: >>>> >>>> - added support for Postgres Extended Query protocol (P3PreparedStatement) (thx Jan @jvdsandt) >>>> - added support for reading array type values (currently INTEGER[] FLOAT[] BOOLEAN[] TEXT[] VARCHAR[]) >>>> - added P3-Tests package and moved all tests there >>>> - more comments >>>> - more unit tests >>>> >>>> https://github.com/svenvc/P3/releases/tag/v1.1 >>>> >>>> >>>> Especially Jan's contribution adds a lot of functionality: the ability to work with prepared statements. >>>> >>>> Here is an example doing a batch insert of 100 records (which is more efficient). >>>> >>>> | client statement | >>>> >>>> client := P3Client url: 'psql://sven@localhost'. >>>> >>>> client execute: 'DROP TABLE IF EXISTS table1'. >>>> client execute: 'CREATE TABLE table1 (id SERIAL PRIMARY KEY, created_at TIMESTAMP DEFAULT NOW(), name TEXT)'. >>>> >>>> statement := client prepare: 'INSERT INTO table1 (name) VALUES ($1)'. >>>> statement executeBatch: ((1 to: 100) collect: [ :index | Array with: ('Text #', index printString) ]). >>>> >>>> client query: 'SELECT * FROM table1'. >>>> client execute: 'DROP TABLE table1'. >>>> >>>> statement close. >>>> client close. >>>> >>>> >>>> Season's Greetings to you all. >>>> >>>> Sven >>>> >>>> >>>> -- >>>> Sven Van Caekenberghe >>>> Proudly supporting Pharo >>>> http://pharo.org >>>> http://association.pharo.org >>>> http://consortium.pharo.org >>>> >>>> >>>> >>>> >>> >>> -- >>> www.feenk.com >>> >>> "What is more important: To be happy, or to make happy?" >>> >> >> -- >> www.feenk.com >> >> "Quality cannot be an afterthought." >> > > > > -- www.feenk.com "No matter how many recipes we know, we still value a chef."

2 2

Re: [Pharo-users] Library to use multi-core in Pharo?
by Thierry Goubier Jan. 9, 2019

Jan. 9, 2019

Hi Alexandre, look at taskit: (https://github.com/sbragagnolo/taskit) I think it can do what you are looking for. I think that OSProcess is also able to do that via fork calls. Having minimal, light weight images without complex loading preferences and whatever would help, otherwise simply forking your current image could be faster. Thierry Le mer. 9 janv. 2019 Ã 19:42, Alexandre Bergel via Pharo-users <pharo-users(a)lists.pharo.org> a Ã©crit : > > Hi! > > Is there an effort to easily use multi-core or native processes in Pharo? > I am thinking about a library that offer a construct like: > > future := Runner runInDifferentProcess: [ âThis block is run in a different OS processâ ] > > That would save the image under a different name, use OSSubProcess to launch a new Pharo with no UI. > > Is there a library available? > > Cheers, > Alexandre > -- > _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: > Alexandre Bergel http://www.bergel.eu > ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. > > >

1 1

Documentation on Traits
by Konrad Hinsen Jan. 9, 2019

Jan. 9, 2019

Dear Pharo experts, Is there any documentation on traits as implemented in Pharo 7? It's easy to find discussions about the trait feature over the years, plus slides and related stuff, but I am not sure what the current actually implemented version is. I did manage to write and use a first trait (https://github.com/khinsen/EqualityThroughVariablesTrait) but there seem to be more advanced features such as slots that I don't know anything about. Cheers, Konrad.

5 6

Re: [Pharo-users] Library to use multi-core in Pharo?
by HernÃ¡n Morales Durand Jan. 9, 2019

Jan. 9, 2019

Hi Alex, I think you could launch jobs using GNU parallel, otherwise for shared memory parallelism OpenMP is a common choice. There is an old thread: http://forum.world.st/NativeBoost-and-OpenMP-td4837865.html but no library AFAIK Cheers, HernÃ¡n El miÃ©., 9 ene. 2019 a las 16:56, Alexandre Bergel via Pharo-users (< pharo-users(a)lists.pharo.org>) escribiÃ³: > Hi! > > Is there an effort to easily use multi-core or native processes in Pharo? > I am thinking about a library that offer a construct like: > > future := Runner runInDifferentProcess: [ âThis block is run in a > different OS processâ ] > > That would save the image under a different name, use OSSubProcess to > launch a new Pharo with no UI. > > Is there a library available? > > Cheers, > Alexandre > -- > _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: > Alexandre Bergel http://www.bergel.eu > ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. > > > >

1 0

[REMINDER] Camp Smalltalk 2019 in Charlotte, NC at the end of March!
by Mariano Martinez Peck Jan. 9, 2019

Jan. 9, 2019

Happy New Year to All! For those that haven't heard, Instantiations is sponsoring a Camp Smalltalk on March 29th â March 31st 2019 in Charlotte, North Carolina. Please register for the event soon as spots will be limited. Event details and registration info are available at the following link: Camp Smalltalk Charlotte 2019 <https://www.eventbrite.com/e/camp-smalltalk-charlotte-2019-tickets-52380940…> Hope to see you there! -- Mariano https://twitter.com/MartinezPeck http://marianopeck.wordpress.com

1 0

Library to use multi-core in Pharo?
by Alexandre Bergel Jan. 9, 2019

Jan. 9, 2019

Hi! Is there an effort to easily use multi-core or native processes in Pharo? I am thinking about a library that offer a construct like: future := Runner runInDifferentProcess: [ âThis block is run in a different OS processâ ] That would save the image under a different name, use OSSubProcess to launch a new Pharo with no UI. Is there a library available? Cheers, Alexandre -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.

1 0

Re: [Pharo-users] Is it possible to follow an object through a computation?
by Esteban Maringolo Jan. 9, 2019

Jan. 9, 2019

Hi Paul, You can set the object to be "read only" (aka "immutable") and handle the exception. E.g. | u | u := User named: 'Paul'. u beReadOnlyObject. [ "your code modifying u's state" ] on: ModificationForbidden do: [ :ex | ex halt. "inspect state" u beWritableObject. ex resume ]. Probably there is a better way to do this with slots, using default ones or subclassing `InstanceVariableSlot` for that instance only and halting on the `write:to:` method of it. Regards, Esteban A. Maringolo El miÃ©., 2 ene. 2019 a las 15:45, PAUL DEBRUICKER via Pharo-users (< pharo-users(a)lists.pharo.org>) escribiÃ³: > Hi - > > Is there a way to haltOnChange or some such for an object? > > > I have an instance that gets into a state I don't understand and would > like to watch it or several of its inst vars for when they change. > > I could set a lot of #haltIf: statements and step through but hope someone > has a better strategy > > > thanks & happy new year. > > > Paul >

2 1

Re: [Pharo-users] Updating singletons
by Ben Coman Jan. 9, 2019

Jan. 9, 2019

On Thu, 3 Jan 2019 at 20:01, Konrad Hinsen via Pharo-users < pharo-users(a)lists.pharo.org> wrote: > Dear Pharo experts, > > I am wondering if there is a good way to deal with singleton objects > whose value needs to be updated following changes in the code that > initializes it. > > Following the model of many examples in Pharo itself, I have defined a > singleton class with a uniqueInstance method for accessing (and creating > if necessary) the single instance, and a method "reset" marked as a > script to set the uniqueInstance back to nil when required, i.e. after > source code changes make the prior value inappropriate. > > This works very well, as long as I don't forget to do the reset, which > has already caused me a few hours of debugging time. Worse, suppose > someone else is using my project in progress, pulling changes from my > GitHub repo once per week. That person cannot know if the latest changes > require a singleton reset. More importantly, users shouldn't have to > know about such internal details at all. > > So is there a way to do the reset automatically whenever a new version > of my package is loaded into an image? > > Thanks in advance, > Konrad. > You might use a Baseline #postLoadDoIt: https://github.com/pharo-open-documentation/pharo-wiki/blob/master/General/… Consider that a person pulling your changes cannot know if you have upgraded the library versions of any dependencies, so always updating via a Baseline might be a reasonable expectation. But that doesn't help you while developing within the one image. cheers -ben

3 5