September 2016 - Pharo-users

Re: [Pharo-users] [SCREENCAST] Creating GUIs with Pharo

by Esteban Lorenzano

I will not be able to attend :( (Iâm in a train nowâ¦ but as a regular observationâ¦ I think a Friday 21h is not the best moment :P) Esteban > On 09 Sep 2016, at 20:30, Dimitris Chloupis <kilon.alios(a)gmail.com> wrote: > > Just a friendly reminder the screencast will begin in 30 minutes. > > https://www.twitch.tv/kilonalios <https://www.twitch.tv/kilonalios> > > > > On Fri, Sep 9, 2016 at 2:09 PM Dimitris Chloupis <kilon.alios(a)gmail.com <mailto:kilon.alios@gmail.com>> wrote: > Sure no problem , I am always online with Discord, so even if one does not attend he can ask me to show him on a next screencast. I will try to make one screencast per month. 50 per year , one or half hour long depending on the subject and how much I know. For those that prefer the mailing list you can use this thread for discussion. > On Fri, 9 Sep 2016 at 13:07, Ben Coman <btc(a)openinworld.com <mailto:btc@openinworld.com>> wrote: > Sounds interesting but its 3am for me, so probably I wont attend. I > look forward to watch it later. > > cheers -ben > > On Fri, Sep 9, 2016 at 5:39 PM, Dimitris Chloupis <kilon.alios(a)gmail.com <mailto:kilon.alios@gmail.com>> wrote: > > So as I promised tonight I will share a live screencast about creating GUIs > > with Pharo, that includes UIManager , Morphic and a bit of Spec. The focus > > will be mainly Morphic that I am more familiar with. > > > > The place is my twitch channel > > > > https://www.twitch.tv/kilonalios <https://www.twitch.tv/kilonalios> > > > > You dont need an account to watch but if you want to chat with me live > > during the screencast you do. I will be checking Discord chat as well. > > > > The time is 22:00 local time (Athens, Greece) which is 20:00 GMT (including > > +1 hour summer time) which is 19:00 UTC (no +1 hour summer time) > > there is also a countdown here > > > > https://www.timeanddate.com/countdown/launch?iso=20160909T22&p0=26&msg=%5BS… <https://www.timeanddate.com/countdown/launch?iso=20160909T22&p0=26&msg=%5BS…> > > > > After the screencast I will be in the Discord channel for questions and > > ideas , you can get an invite here > > > > https://discord.gg/F6nAd <https://discord.gg/F6nAd> > > > > If you are unable to attend , Twitch makes screencasts available online to > > watch any time its convenient for you > > > > See you then, have fun :) > > > > >

Sept. 9, 2016

Re: [Pharo-users] [SCREENCAST] Creating GUIs with Pharo

by Dimitris Chloupis

Just a friendly reminder the screencast will begin in 30 minutes. https://www.twitch.tv/kilonalios On Fri, Sep 9, 2016 at 2:09 PM Dimitris Chloupis <kilon.alios(a)gmail.com> wrote: > Sure no problem , I am always online with Discord, so even if one does not > attend he can ask me to show him on a next screencast. I will try to make > one screencast per month. 50 per year , one or half hour long depending on > the subject and how much I know. For those that prefer the mailing list you > can use this thread for discussion. > On Fri, 9 Sep 2016 at 13:07, Ben Coman <btc(a)openinworld.com> wrote: > >> Sounds interesting but its 3am for me, so probably I wont attend. I >> look forward to watch it later. >> >> cheers -ben >> >> On Fri, Sep 9, 2016 at 5:39 PM, Dimitris Chloupis <kilon.alios(a)gmail.com> >> wrote: >> > So as I promised tonight I will share a live screencast about creating >> GUIs >> > with Pharo, that includes UIManager , Morphic and a bit of Spec. The >> focus >> > will be mainly Morphic that I am more familiar with. >> > >> > The place is my twitch channel >> > >> > https://www.twitch.tv/kilonalios >> > >> > You dont need an account to watch but if you want to chat with me live >> > during the screencast you do. I will be checking Discord chat as well. >> > >> > The time is 22:00 local time (Athens, Greece) which is 20:00 GMT >> (including >> > +1 hour summer time) which is 19:00 UTC (no +1 hour summer time) >> > there is also a countdown here >> > >> > >> https://www.timeanddate.com/countdown/launch?iso=20160909T22&p0=26&msg=%5BS… >> > >> > After the screencast I will be in the Discord channel for questions and >> > ideas , you can get an invite here >> > >> > https://discord.gg/F6nAd >> > >> > If you are unable to attend , Twitch makes screencasts available online >> to >> > watch any time its convenient for you >> > >> > See you then, have fun :) >> > >> > >> >>

Sept. 9, 2016

Re: [Pharo-users] arrays with FFI structs

by Esteban Lorenzano

by the way, this is a new feature of UFFIâ¦ old NB didnât have it :) > On 09 Sep 2016, at 19:17, Esteban Lorenzano <estebanlm(a)gmail.com> wrote: > > not very well (I didnât adapted the parser or optimised it, but it works fine :P). > you need to declare a type: > > CXCursor class>>initiallize > VoidPointer3 := FFITypeArray ofType: âvoid*â. > > then you declare: > > CXCursor class >> fieldsDesc > "self rebuildFieldAccessors" > ^ #( > int kind; > int xdata; > VoidPointer3 data; > ) > > that should work (never tried with void*, but I do not see why wouldnât work) > > cheers, > Esteban > > ps: and yes, the idea is to extend the parser for doing thisâ¦ but no time :( > >> On 09 Sep 2016, at 19:11, Ben Coman <btc(a)openinworld.com> wrote: >> >> Are arrays within structs handled? I have a C type declaration... >> >> typedef struct { >> enum CXCursorKind kind; >> int xdata; >> const void *data[3]; >> } CXCursor; >> >> which for the moment I've simplified the enum and defined... >> >> FFIExternalStructure subclass: #CXCursor >> instanceVariableNames: '' >> classVariableNames: '' >> package: 'Libclang' >> >> CXCursor class >> fieldsDesc >> "self rebuildFieldAccessors" >> ^ #( >> int kind; >> int xdata; >> void *data[3]; >> ) >> >> an evaluated... >> CXCursor rebuildFieldAccessors >> >> but it produces... Error: Unable to resolve external type: [ >> So it seems arrays inside structs are currently not handled ? >> >> Now I read the typedef as "data is an array of three pointers to >> void", so how likely is it for something like this to work... >> >> CXCursor class >> fieldsDesc >> "self rebuildFieldAccessors" >> ^ #( >> int kind; >> int xdata; >> void *data1; >> void *data2; >> void *data3; >> ) >> >> I'll experiment some more in the meantime. >> >> cheers -ben >> >

Sept. 9, 2016

Re: [Pharo-users] arrays with FFI structs

by Esteban Lorenzano

not very well (I didnât adapted the parser or optimised it, but it works fine :P). you need to declare a type: CXCursor class>>initiallize VoidPointer3 := FFITypeArray ofType: âvoid*â. then you declare: CXCursor class >> fieldsDesc "self rebuildFieldAccessors" ^ #( int kind; int xdata; VoidPointer3 data; ) that should work (never tried with void*, but I do not see why wouldnât work) cheers, Esteban ps: and yes, the idea is to extend the parser for doing thisâ¦ but no time :( > On 09 Sep 2016, at 19:11, Ben Coman <btc(a)openinworld.com> wrote: > > Are arrays within structs handled? I have a C type declaration... > > typedef struct { > enum CXCursorKind kind; > int xdata; > const void *data[3]; > } CXCursor; > > which for the moment I've simplified the enum and defined... > > FFIExternalStructure subclass: #CXCursor > instanceVariableNames: '' > classVariableNames: '' > package: 'Libclang' > > CXCursor class >> fieldsDesc > "self rebuildFieldAccessors" > ^ #( > int kind; > int xdata; > void *data[3]; > ) > > an evaluated... > CXCursor rebuildFieldAccessors > > but it produces... Error: Unable to resolve external type: [ > So it seems arrays inside structs are currently not handled ? > > Now I read the typedef as "data is an array of three pointers to > void", so how likely is it for something like this to work... > > CXCursor class >> fieldsDesc > "self rebuildFieldAccessors" > ^ #( > int kind; > int xdata; > void *data1; > void *data2; > void *data3; > ) > > I'll experiment some more in the meantime. > > cheers -ben >

Sept. 9, 2016

arrays with FFI structs

by Ben Coman

Are arrays within structs handled? I have a C type declaration... typedef struct { enum CXCursorKind kind; int xdata; const void *data[3]; } CXCursor; which for the moment I've simplified the enum and defined... FFIExternalStructure subclass: #CXCursor instanceVariableNames: '' classVariableNames: '' package: 'Libclang' CXCursor class >> fieldsDesc "self rebuildFieldAccessors" ^ #( int kind; int xdata; void *data[3]; ) an evaluated... CXCursor rebuildFieldAccessors but it produces... Error: Unable to resolve external type: [ So it seems arrays inside structs are currently not handled ? Now I read the typedef as "data is an array of three pointers to void", so how likely is it for something like this to work... CXCursor class >> fieldsDesc "self rebuildFieldAccessors" ^ #( int kind; int xdata; void *data1; void *data2; void *data3; ) I'll experiment some more in the meantime. cheers -ben

Sept. 9, 2016

Re: [Pharo-users] Adopting someone else's image

by Stephan Eggermont

On 09-09-16 13:08, Siemen Baader wrote: > What can I do? Is there a proper way to re-initialize the host dependent > state when taking over someone else's image? I know the preferred way to > share code without state is to use Montichello... In a copy of an image, just open an inspector and set the path. It is a known bug, and I think it was fixed already. Might need a backport Stephan

Sept. 9, 2016

Re: [Pharo-users] SpecBooklet: Strange behavior of ProtocolBrowser

by stepharo

Le 8/9/16 Ã 15:14, Johan Fabry a Ã©crit : > Thanks Stef ! There will be a new chapter for you to review soon ;-) eagerly waiting :) Johan we should say that the booklet is for Pharo 60. Like that we have the time to finish it. Stef > > -- > Does this mail seem too brief? Sorry for that, I donât mean to be rude! Please see http://emailcharter.org . > > Johan Fabry - http://pleiad.cl/~jfabry > PLEIAD and RyCh labs - Computer Science Department (DCC) - University of Chile > >> On Sep 8, 2016, at 04:39, stepharo <stepharo(a)free.fr> wrote: >> >> Johan >> >> >> let me know if there is anything that I should do. >> >> >> Stef >> > >

Sept. 9, 2016

Problem cleaning up image

by Vitor Medina Cruz

Hello, Isn't cleanup the headless image working right now? I know it has some problems, but I tried to: curl get.pharo.org | bash ./pharo Pharo.image clean --production It runs for hours and don't complete. Last time I leave it for about 5 hours before I cancelled. Regards, Vitor

Sept. 9, 2016

Re: [Pharo-users] Performance vs Ruby performance

by Vitor Medina Cruz

Thank you for the answers! On Thu, Sep 8, 2016 at 3:31 AM, Dimitris Chloupis <kilon.alios(a)gmail.com> wrote: > It does not matter. When it comes to performance the workflow is always > the same whatever the language you use. > > 1. Profile the code see where it consume most CPU cycles > 2. Can you improve the code to remove unnecessary processing ? You will be > surprised how many times its your code and not the language that is slow > 3. If it's not your code can you find a library written in C that is > optimized for speed ? > 4. If no then write the code in C compile it as shared library and use it > from the language of your choice using an FFI > > Basically when a VM in a dynamic language finds a call to a C shared > library using the FFI it will freeze everything and give priority to the C > code to execute the call to its native speed. Then after the execution the > VM resumes. There is an overhead however for making the call. > > Because speed depends on the factors I described above for many > experienced coders general benchmarks are completely useless. > > Speed in the end is just machine code with as less instructions as > possible using most hardware acceleration as possible. > > Talking about hardware acceleration if you try to do the same processing > on a list of data which is very large in parallel don't even consider C , > instead go directly to GPU because it can accelerate even up to 100 times > compared to CPU. But in the end will depend on how much speed you really > need. If you indeed need it then you can accelerate your code using the GPU > with the help of CUDA or OpenCL. > > Remember however that optimizing is the root of true evil , it will make > your code ugly, hard to read, difficult to extend and much more buggy. > > PS: the vast majority of benchmarks including the ones linked by Clement > use just code written in the language tested also using the library that > the language comes with. That means that they use none of the normal > optimizations I described above and hence they cannot be considered > practical realistic scenarios. > > On Thu, 8 Sep 2016 at 02:30, Vitor Medina Cruz <vitormcruz(a)gmail.com> > wrote: > >> Hello, >> >> How is Pharo compared with Ruby in terms of performance? Has someone done >> some comparison benchmark? If yes, that was done with other platforms? >> >> Regards, >> VItor >> >

Sept. 9, 2016

Re: [Pharo-users] [SCREENCAST] Creating GUIs with Pharo

by Dimitris Chloupis

Sure no problem , I am always online with Discord, so even if one does not attend he can ask me to show him on a next screencast. I will try to make one screencast per month. 50 per year , one or half hour long depending on the subject and how much I know. For those that prefer the mailing list you can use this thread for discussion. On Fri, 9 Sep 2016 at 13:07, Ben Coman <btc(a)openinworld.com> wrote: > Sounds interesting but its 3am for me, so probably I wont attend. I > look forward to watch it later. > > cheers -ben > > On Fri, Sep 9, 2016 at 5:39 PM, Dimitris Chloupis <kilon.alios(a)gmail.com> > wrote: > > So as I promised tonight I will share a live screencast about creating > GUIs > > with Pharo, that includes UIManager , Morphic and a bit of Spec. The > focus > > will be mainly Morphic that I am more familiar with. > > > > The place is my twitch channel > > > > https://www.twitch.tv/kilonalios > > > > You dont need an account to watch but if you want to chat with me live > > during the screencast you do. I will be checking Discord chat as well. > > > > The time is 22:00 local time (Athens, Greece) which is 20:00 GMT > (including > > +1 hour summer time) which is 19:00 UTC (no +1 hour summer time) > > there is also a countdown here > > > > > https://www.timeanddate.com/countdown/launch?iso=20160909T22&p0=26&msg=%5BS… > > > > After the screencast I will be in the Discord channel for questions and > > ideas , you can get an invite here > > > > https://discord.gg/F6nAd > > > > If you are unable to attend , Twitch makes screencasts available online > to > > watch any time its convenient for you > > > > See you then, have fun :) > > > > > >

Sept. 9, 2016