September 2017 - Pharo-users

Re: [Pharo-users] Web stack practices (Glorp / QCMagritte)

by Richard Sargent

laurent laffont wrote > Hi all, > > it's been a long time :) At work we are currently comparing several > technologies to start a business project that will hopefully be used by > thousands of people for several years ;) Laurent, I realize you are asking this on the Pharo list, looking for a Pharo-specific answer. You should also post your requirements on the GLASS list (http://forum.world.st/GLASS-f1460844.html) A number of people/businesses there use a /develop on Pharo, deploy on GemStone approach/. They will be able to give you some good advice on using GemStone/S for your database. > We need a web stack and we put Pharo & co in the comparative process. > My team have strong experience in load-balanced php / mysql deployment > that handles millions of records but we are ready to build on > something else though MySQL is still a requirement. > > Thanks for Garage + Glorp, I can prototype things. I wonder how to > handle database schema migrations. With our PHP projects we have > versionned PHP scripts that are automatically run given a database > revision number ( see > http://git.afi-sa.fr/afi/opacce/tree/master/cosmogramme/sql/patch ). > What are the practices with Glorp ? > > > We try QCMagritte and we enjoy what we see so far. What are the best > practices to glue Magritte and Glorp together ? Especially when you > load-balance requests on several images. Some examples ? > > ( FYI, I cannot load QCMagritte in a fresh Pharo 6 image ( for #stable > version, MADescriptionBuilder missing. For #development versions of > Magritte and QCMagritte, QCConfiguration missing ). So actually I use > the one built on CI. ) > > > May be you have some other suggestions on a framework you love ? > > > Best regards, > > Laurent Laffont -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

Sept. 19, 2017

Re: [Pharo-users] Continued Fractions

by phil＠highoctane.be

I need to match print ads sizes from various publications with a standardized list of ratios (e.g. 2:1, 1:1, 2:7...) plus a bunch of other metrics. So a rect of 1543@331 gives a float value that has can be best approximated by a continued fraction approach. But there are other complications. Now I am using a lookup table and try to match with just a distance. I am using DataFrame and hopefully more Roassal for all of this. Pharo can be a good tool to manage the object model of this problem space. I am prototyping something. We'll see how far I can get. Phil On Tue, Sep 19, 2017 at 9:30 PM, Stephane Ducasse <stepharo.self(a)gmail.com> wrote: > Hi phil > > just out of sane curiosity do you have a pointer on ratio and > rectangle and continued fraction? > > Stef > > On Mon, Sep 18, 2017 at 12:40 PM, werner kassens <wkassens(a)libello.com> > wrote: > > Hi Phil, > > yes, in polymath it is the the object PMContinuedFraction. > > werner > > > > > > On 09/17/2017 08:38 PM, phil(a)highoctane.be wrote: > > > > Ah, I see there is something in the Numerical Methods book. :rolleyes: > > > > Phil > > > > On Sun, Sep 17, 2017 at 8:30 PM, phil(a)highoctane.be <phil(a)highoctane.be> > > wrote: > >> > >> Do we have anything related to continued fractions in Pharo? > >> > >> https://en.wikipedia.org/wiki/Continued_fraction > >> > >> I need that to match rectanges to aspect ratios etc. > >> > >> TIA > >> Phil > > > > > > > > >

Sept. 19, 2017

Re: [Pharo-users] Smalltalk gets a reference in fastcompany Kay interview

by Hilaire

Thanks to share the article. Alan Kay thought can be hard to follow, especially considering, in one hand, his main foci are education, educating, authoring media, and in the other hand, his audience is mainly in the computer field without much notion about education & al. His main vision, about computerized authoring tool to enlighten the mind is a strong and exciting assertion. In this vision, the users will build their own model to explore a given concept. Etoys was really what came close to this idea, with medias you can interconnect to build simulation, model, etc. It let you build these things more easily than any programming tool. However I am wondering if even talented young students or teachers can really embrace it. I know talented teachers and I doubt they could do it with Etoys. May be Etoys was just itching the surface of this vision. Hilaire Le 17/09/2017 Ã 14:34, Tim Mackinnon a Ã©critÂ : > Interesting (although I found slightly rambling) interview with Alan > Kay about personal computing. But Smalltalk does get a link. > > https://medium.com/fast-company/the-father-of-mobile-computing-is-not-impre… > <https://medium.com/fast-company/the-father-of-mobile-computing-is-not-impre…> > > Tim -- Dr. Geo http://drgeo.eu

Sept. 19, 2017

Re: [Pharo-users] Continued Fractions

by Stephane Ducasse

Hi phil just out of sane curiosity do you have a pointer on ratio and rectangle and continued fraction? Stef On Mon, Sep 18, 2017 at 12:40 PM, werner kassens <wkassens(a)libello.com> wrote: > Hi Phil, > yes, in polymath it is the the object PMContinuedFraction. > werner > > > On 09/17/2017 08:38 PM, phil(a)highoctane.be wrote: > > Ah, I see there is something in the Numerical Methods book. :rolleyes: > > Phil > > On Sun, Sep 17, 2017 at 8:30 PM, phil(a)highoctane.be <phil(a)highoctane.be> > wrote: >> >> Do we have anything related to continued fractions in Pharo? >> >> https://en.wikipedia.org/wiki/Continued_fraction >> >> I need that to match rectanges to aspect ratios etc. >> >> TIA >> Phil > > >

Sept. 19, 2017

Re: [Pharo-users] Web stack practices (Glorp / QCMagritte)

by Stephane Ducasse

Hi laurent Let us know how we can help. If necessary we can send our 15 year experience Java Architect and nearly the same in Pharo (Esteban) to meet you at Annecy. Did you see that Sven released also a native driver for SQL30? I do not remember. I do not know if you see but sorabito deploys everything in Pharo and they mixed also mustache and Seaside. BTW I know a german company that got a nice and large project for a large train company and they will use Pharo on the server (plus mobile apps and others). I can put you in contact also. Mariano and Quuve used Gemstone + magritte. But this is not the same techno :) Stef On Mon, Sep 18, 2017 at 12:22 PM, laurent <laurent.laffont(a)gmail.com> wrote: > Hi all, > > it's been a long time :) At work we are currently comparing several > technologies to start a business project that will hopefully be used by > thousands of people for several years ;) > > We need a web stack and we put Pharo & co in the comparative process. My > team have strong experience in load-balanced php / mysql deployment that > handles millions of records but we are ready to build on something else > though MySQL is still a requirement. > > Thanks for Garage + Glorp, I can prototype things. I wonder how to handle > database schema migrations. With our PHP projects we have versionned PHP > scripts that are automatically run given a database revision number ( see > http://git.afi-sa.fr/afi/opacce/tree/master/cosmogramme/sql/patch ). What > are the practices with Glorp ? > > > We try QCMagritte and we enjoy what we see so far. What are the best > practices to glue Magritte and Glorp together ? Especially when you > load-balance requests on several images. Some examples ? > > ( FYI, I cannot load QCMagritte in a fresh Pharo 6 image ( for #stable > version, MADescriptionBuilder missing. For #development versions of Magritte > and QCMagritte, QCConfiguration missing ). So actually I use the one built > on CI. ) > > > May be you have some other suggestions on a framework you love ? > > > Best regards, > > Laurent Laffont > > > > >

Sept. 19, 2017

Re: [Pharo-users] Standalone HTML Model

by Sean P. DeNigris

Craig Latta wrote > Oh, it wasn't clear to me that this was one of Sean's requirements. I would say "sorry" but I'm glad I wasn't clear because I learned something cool from your reply ;) ----- Cheers, Sean -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

Sept. 19, 2017

Re: [Pharo-users] "Leaking" CommandLineHandler when running headless image

by Tim Mackinnon

There was a long post from Guille about how to sort this. It had to do with altering the priority of shutdown code - I'm not sure if we resolved it, but we should go back and see as it was well reasoned. Tim Sent from my iPhone > On 19 Sep 2017, at 14:20, Denis Kudriashov <dionisiydk(a)gmail.com> wrote: > > Hi. > > It is probably related to issue 20309 > > 2017-09-19 15:02 GMT+02:00 Holger Freyther <holger(a)freyther.de>: >> Hi, >> >> I am currently trying to run one of my images as non-root and related to that look into keeping changes in a different directory or not writing them at all. While looking at a write failure I saw some paths being logged that I used during CI to load code and should have been GCed. >> >> >> Observation: >> >> >> Pharo --headless My.image eval "Smalltalk garbageCollect. CommandLineHandler allSubInstances size" >> 84 >> >> Pharo --headfull My.image eval "Smalltalk garbageCollect. CommandLineHandler allSubInstances size" >> 2 >> >> >> As part of the CommandLineHandler allSubInstances there are eight LoadUpdatesCommandLineHandler still active. I would assume that a full GC should have collected them by now (some of them being created in May). In a headfull image they disappear quickly >> >> I varied the execution a bit: >> >> Pharo --headless RoamingHub.image eval --no-quit "[ Smalltalk garbageCollect. FileStream stdout print: CommandLineHandler allSubInstances size; lf. Smalltalk snapshot: false andQuit: true] fork" >> 0 >> >> >> Hypothesis: >> >> >> * Command line handlers call >>#snapshot:andQuit:. >> * Image resumes in this process >> * New session created >> * Command line handlers execute >> * Calls snapshot:andQuit: >> * Image resumes.. >> * New session created >> * Command line handlers execute >> ... >> >> >> Can this be true? I think the proposal to start the image differently would help here? Any comments/ideas? >> >> holger >

Sept. 19, 2017

Re: [Pharo-users] "Leaking" CommandLineHandler when running headless image

by Denis Kudriashov

Hi. It is probably related to issue 20309 <https://pharo.fogbugz.com/f/cases/20309/Startup-should-run-always-in-a-fres…> 2017-09-19 15:02 GMT+02:00 Holger Freyther <holger(a)freyther.de>: > Hi, > > I am currently trying to run one of my images as non-root and related to > that look into keeping changes in a different directory or not writing them > at all. While looking at a write failure I saw some paths being logged that > I used during CI to load code and should have been GCed. > > > Observation: > > > Pharo --headless My.image eval "Smalltalk garbageCollect. > CommandLineHandler allSubInstances size" > 84 > > Pharo --headfull My.image eval "Smalltalk garbageCollect. > CommandLineHandler allSubInstances size" > 2 > > > As part of the CommandLineHandler allSubInstances there are eight > LoadUpdatesCommandLineHandler still active. I would assume that a full GC > should have collected them by now (some of them being created in May). In a > headfull image they disappear quickly > > I varied the execution a bit: > > Pharo --headless RoamingHub.image eval --no-quit "[ Smalltalk > garbageCollect. FileStream stdout print: CommandLineHandler allSubInstances > size; lf. Smalltalk snapshot: false andQuit: true] fork" > 0 > > > Hypothesis: > > > * Command line handlers call >>#snapshot:andQuit:. > * Image resumes in this process > * New session created > * Command line handlers execute > * Calls snapshot:andQuit: > * Image resumes.. > * New session created > * Command line handlers execute > ... > > > Can this be true? I think the proposal to start the image differently > would help here? Any comments/ideas? > > holger >

Sept. 19, 2017

"Leaking" CommandLineHandler when running headless image

by Holger Freyther

Hi, I am currently trying to run one of my images as non-root and related to that look into keeping changes in a different directory or not writing them at all. While looking at a write failure I saw some paths being logged that I used during CI to load code and should have been GCed. Observation: Pharo --headless My.image eval "Smalltalk garbageCollect. CommandLineHandler allSubInstances size" 84 Pharo --headfull My.image eval "Smalltalk garbageCollect. CommandLineHandler allSubInstances size" 2 As part of the CommandLineHandler allSubInstances there are eight LoadUpdatesCommandLineHandler still active. I would assume that a full GC should have collected them by now (some of them being created in May). In a headfull image they disappear quickly I varied the execution a bit: Pharo --headless RoamingHub.image eval --no-quit "[ Smalltalk garbageCollect. FileStream stdout print: CommandLineHandler allSubInstances size; lf. Smalltalk snapshot: false andQuit: true] fork" 0 Hypothesis: * Command line handlers call >>#snapshot:andQuit:. * Image resumes in this process * New session created * Command line handlers execute * Calls snapshot:andQuit: * Image resumes.. * New session created * Command line handlers execute ... Can this be true? I think the proposal to start the image differently would help here? Any comments/ideas? holger

Sept. 19, 2017

Re: [Pharo-users] Web stack practices (Glorp / QCMagritte)

by laurent

Thank you Esteban & Joachim for your answers. Laurent Le lun. 18 sept. 2017 Ã 14:58, jtuchel(a)objektfabrik.de <jtuchel(a)objektfabrik.de> a Ã©crit : > Laurent, > > I don't have answers to all your questions, but we use Glorp & > Seaside (no Magritte) on VA Smalltalk for our cloud service > (http://kontolino.de) > > > > Am 18.09.17 um 12:22 schrieb laurent: >> Hi all, >> >> it's been a long time :) At work we are currently comparing several >> technologies to start a business project that will hopefully be used >> by thousands of people for several years ;) >> >> We need a web stack and we put Pharo & co in the comparative >> process. My team have strong experience in load-balanced php / >> mysql deployment that handles millions of records but we are ready >> to build on something else though MySQL is still a requirement. > Sounds interesting. > >> >> Thanks for Garage + Glorp, I can prototype things. I wonder how to >> handle database schema migrations. With our PHP projects we have >> versionned PHP scripts that are automatically run given a database >> revision number ( see >> http://git.afi-sa.fr/afi/opacce/tree/master/cosmogramme/sql/patch ). >> What are the practices with Glorp ? >> > We use a similar approach: our Descriptor class has a method called > schemaVersion, which just returns the current version number. We also > have a "magic" table for settings in our DB, just holding a "name" > and a "value" column, both being Varchars. One of the rows has a name > of "SchemaVersion" and the value is (you guessed it) the printString > of the version number. > > Our images accept a few command line paramters, one of them being > --upgradeSchema. It compoares the number in the DB with the one > provided by the descriptor. If they match, the image quits. If not, > it calls all methods named #upgradeSchemaToVersionXXX until it > reaches the number in the Descriptor. Thus we can do both SQL based > migrations, like DDL stuff, as well as Smalltalk object based > migrations (which can be sooo much faster to implement for complex > cases). And we have all versioned and maintained in our beloved Envy > repository ;-) . > The rest is just bash script magic (like only starting one image with > the --upgradeSchema parameter and only start the real web workers > once that one has ended succesfully). > > > About load balancing: You need Sticky sessions, so no failover > between images. If one image crashes, the user must re-logon on a new > image. Works nicely with Apache, I guess nginx works as least as > well. For Apache, look for mod_prox_balancer to learn more. > > > Hope I could give you a few starting points for your research. And I > also hope you'll find Pharo+Garage+Glorp+QCMagritte a good fit for > your project. We all want success stories ;-) > > > Joachim > > -- > ----------------------------------------------------------------------- > Objektfabrik Joachim Tuchel mailto:jtuchel@objektfabrik.de > Fliederweg 1 http://www.objektfabrik.de > D-71640 Ludwigsburg > http://joachimtuchel.wordpress.com > Telefon: +49 7141 56 10 86 0 Fax: +49 7141 56 10 86 1 >

Sept. 19, 2017