May 2015 - Pharo-dev - lists.pharo.org

Re: [Pharo-dev] Transcript needs your love

by David T. Lewis

On Fri, May 08, 2015 at 08:10:33PM +0200, Igor Stasenko wrote: > > i think there is a fundamental difference between 'stream' and 'update on > the screen' . Choose one and stick to it. > We shall separate such responsibilities and NEVER ever merge them again , > even if it was cool, nice, soft and puffy in the past. > Yes, sure, we can then build the facade on top of that providing similar > behavior of what was in the past.. > > But if not, then it will always be something that will forever be causing > problem, since it is conceptually wrong and looks like attempt to cross > breed two different species. <OT> I have no particular opinions about Transcsript, but I would like to say that I am very happy to have Igor back in the Squeak/Pharo/Cuis/Smalltalk discussions. I may not agree with everything, but I really appreciate his thoughtful perspective. There are a few people whose posts I will always read, and Igor is one of them. </OT> Dave

May 10, 2015

Re: [Pharo-dev] A fast Transcript

by Eliot Miranda

Hi Tudor, On Sat, May 9, 2015 at 2:23 PM, Tudor Girba <tudor(a)tudorgirba.com> wrote: > Hi Eliot, > > Just a question: Could you describe the situations when you need to have > the Transcript editable? > > I am not trying to provoke you, > my reputation preceeds me ;-) > but to understand use cases. While working on GT I found that it is often > possible to support the same use cases with multiple UI solutions. And > sometimes considering alternatives leads to interesting results. > While I have an over-full transcript that holds progress over time, notes etc, these could be moved to a workspace. What I really use editablity in the transcript for is to cut-down output. For example, if I'm analysing some jitted code it will get printed out in the transcript (without a lot of retooling) and it is very convenient to cut down the often large amount of output to focus on what I'm interested in. Or I might be trying to fix a bug with repeated runs and again collect relevant data (print outs of objects or stack frames from the simulator) for use as reference points in later runs. Or I might collect some warnings from the Slang SMalltalk-to-C translator. In short, there's a lot of different kinds of data going to the transcript and it can be useful to edit it in place instead of having to copy it elsewhere. > Cheers, > Doru > > > > On Sat, May 9, 2015 at 9:32 PM, Eliot Miranda <eliot.miranda(a)gmail.com> > wrote: > >> Hi Juan, >> >> I see that your new transcript is indeed much faster but is also not >> editable. I wonder if it would be possible to have the best of both worlds >> and arrange that, when active, the transcript is editable. For example, >> selecting the TranscriptWIndow could put it into a mode where the >> transcript's state was imported into a more conventional editable text >> morph, and then when the window was exited, reverted to the standard fast >> output mode. As you can infer I like having an editable transcript. I can >> do without it, because Squeak's slow transcript is indeed a PITA, but I'm >> not sure that speed need preclude editability. >> >> On Sat, May 9, 2015 at 10:17 AM, J. Vuletich (mail lists) < >> juanlists(a)jvuletich.org> wrote: >> >>> Hi Folks, >>> >>> (below) >>> >>> >>> Quoting Ben Coman <btc(a)openinworld.com>: >>> >>> On Sat, May 9, 2015 at 10:35 PM, Eliot Miranda <eliot.miranda(a)gmail.com >>>> > >>>> wrote: >>>> >>>> >>>>> >>>>> On Sat, May 9, 2015 at 7:09 AM, Ben Coman <btc(a)openinworld.com> wrote: >>>>> >>>>> From my limited experience bug hunting, calling #changed: from a >>>>>> thread >>>>>> other than the UI thread is a source of evil. There are too many >>>>>> assumptions throughout the system that the UI is single threaded. Can >>>>>> anyone advise me that is not a proper belief? >>>>>> >>>>>> Then that implies that a Transcript implementation where #nextPut: >>>>>> direct >>>>>> calls #changed: >>>>>> is not appropriate for use with multi-threaded applications. In >>>>>> Pharo, >>>>>> #changed: is only called from #stepGlobal, which is called from >>>>>> doOneCycle:. (This came about as a last minute bug fix before Pharo 3 >>>>>> release and maybe could use some cleanup. >>>>>> >>>>>> Separating the UI from Transcript into its own viewer might be a good >>>>>> idea, but actually it would not solve Stef's case since his code would >>>>>> still be running in the UI thread -- unless the viewer ran in another >>>>>> thread, which would have its own complexities. >>>>>> >>>>>> I think the point about efficiency is significant. The following >>>>>> example... >>>>>> Time millisecondsToRun: [ 1000 timesRepeat: [ Transcript show: >>>>>> 'x' >>>>>> ] ] >>>>>> on Squeak 4.5 --> 12749ms >>>>>> on Pharo 50029 --> 2ms >>>>>> >>>>>> This better performance helped me a lot trying to understand the high >>>>>> priority timerEventLoop being able to indiscriminately scatter >>>>>> Transcript >>>>>> tracing through that code. I believe its also probably beneficial for >>>>>> working with externally triggered semaphores and timing sensitive race >>>>>> conditions. >>>>>> >>>>>> So we have two mutually exclusive cases: >>>>>> * better interactivity, poorer system performance >>>>>> * faster system performance, worse interactivity >>>>>> >>>>>> Which of these is broken depends on your viewpoint. >>>>>> >>>>>> >>>>> Something that runs fast but is incorrect is still incorrect. The fact >>>>> that the transcript doesn't output until a world step is possible is a >>>>> bug. It forces programs that use the transcript to be rewritten in >>>>> order >>>>> to see transcript output. >>>>> >>>>> >>>> As a point of comparison for correctness, for the following... >>>> >>>> Transcript clear. >>>> [ $a asciiValue to: $z asciiValue do: [ :c | >>>> [ 1 to: 9 do: [ :i | Transcript show: c asCharacter printString , i >>>> printString , ' ' ] ] forkAt: 40 >>>> ]. >>>> ] forkAt: 41 >>>> >>>> Squeak 4.5 gives... >>>> $a1 $a2 $a3 $a4 $a5 $a6 $a7 $a8 $a9 $b1 $b2 $b3 $b4 $b5 $b5 $c1 $c2 $c3 >>>> $c4 >>>> $c5 $c6 $c7 $c8 $c9 $d1 $d2 $d3 $d4 $d5 $d6 $d7 $d8 $d9 $d9 $e2 $g2 $h2 >>>> $h2 >>>> $i2 $k2 $k2 $l2 $n2 $n2 $o2 $o2 $r2 $s2 $t2 $u2 $u2 $v2 $x2 $y2 $z2 $z2 >>>> $b7 >>>> $f3 $e3 $e3 $g3 $j3 $h3 $i3 $k3 $k3 $m3 $n3 $p3 $p3 $q3 $o3 $s3 $t3 $t3 >>>> $u3 >>>> $v3 $x3 $y3 $z3 $b8 $f4 $e4 $e4 $g4 $h4 $i4 $k4 $l4 $m4 $m4 $n4 $r4 $q4 >>>> $o4 >>>> $o4 $s4 $w4 $u4 $u4 $v4 $y4 $y4 $z4 $z4 $f5 $j5 $j5 $g5 $i5 $k5 $l5 $l5 >>>> $m5 >>>> $m5 $n5 $q5 $o5 $s5 $s5 $t5 $u5 $u5 $x5 $y5 $z5 $f6 $f6 $h6 $h6 $g6 $g6 >>>> $k6 >>>> $p6 $m6 $r6 $r6 $n6 $o6 $s6 $s6 $w6 $u6 $x6 $x6 $e7 $f7 $j7 $h7 $h7 $i7 >>>> $l7 >>>> $l7 $k7 $m7 $m7 $q7 $n7 $n7 $o7 $t7 $w7 $w7 $u7 $v7 $x7 $z7 $z7 $e8 $e8 >>>> $h8 >>>> $g8 $i8 $i8 $l8 $k8 $k8 $m8 $q8 $n8 $n8 $s8 $t8 $w8 $y8 $y8 $u8 $x8 $z8 >>>> $f9 >>>> $f9 $e9 $h9 $h9 $g9 $p9 $p9 $k9 $r9 $r9 $m9 $n9 $n9 $o9 $t9 $t9 $w9 $v9 >>>> $u9 >>>> $u9 $z9 $x9 >>>> >>>> Pharo 50041 gives... >>>> $a1 $a2 $a3 $a4 $a5 $a6 $a7 $a8 $a9 $b1 $b2 $b3 $b4 $b5 $b6 $b7 $b8 $b9 >>>> $c1 >>>> $c2 $c3 $c4 $c5 $c6 $c7 $c8 $c9 $d1 $d2 $d3 $d4 $d5 $d6 $d7 $d8 $d9 $e1 >>>> $e2 >>>> $e3 $e4 $e5 $e6 $e7 $e8 $e9 $f1 $f2 $f3 $f4 $f5 $f6 $f7 $f8 $f9 $g1 $g2 >>>> $g3 >>>> $g4 $g5 $g6 $g7 $g8 $g9 $h1 $h2 $h3 $h4 $h5 $h6 $h7 $h8 $h9 $i1 $i2 $i3 >>>> $i4 >>>> $i5 $i6 $i7 $i8 $i9 $j1 $j2 $j3 $j4 $j5 $j6 $j7 $j8 $j9 $k1 $k2 $k3 $k4 >>>> $k5 >>>> $k6 $k7 $k8 $k9 $l1 $l2 $l3 $l4 $l5 $l6 $l7 $l8 $l9 $m1 $m2 $m3 $m4 $m5 >>>> $m6 >>>> $m7 $m8 $m9 $n1 $n2 $n3 $n4 $n5 $n6 $n7 $n8 $n9 $o1 $o2 $o3 $o4 $o5 $o6 >>>> $o7 >>>> $o8 $o9 $p1 $p2 $p3 $p4 $p5 $p6 $p7 $p8 $p9 $q1 $q2 $q3 $q4 $q5 $q6 $q7 >>>> $q8 >>>> $q9 $r1 $r2 $r3 $r4 $r5 $r6 $r7 $r8 $r9 $s1 $s2 $s3 $s4 $s5 $s6 $s7 $s8 >>>> $s9 >>>> $t1 $t2 $t3 $t4 $t5 $t6 $t7 $t8 $t9 $u1 $u2 $u3 $u4 $u5 $u6 $u7 $u8 $u9 >>>> $v1 >>>> $v2 $v3 $v4 $v5 $v6 $v7 $v8 $v9 $w1 $w2 $w3 $w4 $w5 $w6 $w7 $w8 $w9 $x1 >>>> $x2 >>>> $x3 $x4 $x5 $x6 $x7 $x8 $x9 $y1 $y2 $y3 $y4 $y5 $y6 $y7 $y8 $y9 $z1 $z2 >>>> $z3 >>>> $z4 $z5 $z6 $z7 $z8 $z9 >>>> >>>> (start your comparison at $b5) >>>> >>>> So in one axis Pharo has improved Transcript, but we didn't notice the >>>> significance of the use case we lost. >>>> >>>> cheers -ben >>>> >>> >>> Please take a good look at Cuis' Transcript and consider using it. >>> >>> By default, the display is updated immediately, but without calling >>> Morphic, it can even work with no UI framework at all. It does updates >>> faster than Squeak or Visualworks: >>> >>> Time millisecondsToRun: [ 1000 timesRepeat: [ Transcript show: >>> 'x' ] ]. 763. >>> >>> But if you want minimum overhead without immediate feedback: >>> >>> Time millisecondsToRun: [ Transcript showOnDisplay: false. 1000 >>> timesRepeat: [ Transcript show: 'x' ]. Transcript showOnDisplay: true ]. 1. >>> "As fast as Pharo" >>> >>> It is also thread safe, and for Ben's example: >>> >>> Transcript clear. >>> [ >>> $a asciiValue to: $z asciiValue do: [ :c | >>> [ 1 to: 9 do: [ :i | Transcript show: c asCharacter >>> printString , i printString , ' ' ] ] forkAt: 40 >>> ]. >>> ] forkAt: 41 >>> >>> it gives the same result as Pharo. >>> >>> The fact that the updates are not bound to Morphic also means that it is >>> possible to do #show: deep in Morphic logic, without causing infinite loops >>> or recursions, and get immediate feedback. It has proved to be a useful aid >>> in debugging Morphic code. >>> >>> Cheers, >>> Juan Vuletich >>> >>> >>> >> >> >> -- >> best, >> Eliot >> > > > > -- > www.tudorgirba.com > > "Every thing has its own flow" > -- best, Eliot

May 10, 2015

Re: [Pharo-dev] Transcript needs your love

by Yuriy Tymchuk

For me saying that internals are not important as long as transcript does what is expected from it, is like saying that Parser being a subclass of Scanner and Compiler being as subclass of Parser is ok as long as it compiles source code. We already had that and it was bad. On the other hand itâs obvious that we donât have enough resources to rewrite Pharo from scratch and we cannot leave issues as they are just because we cannot solve them perfectly now. I would say that Igor is correct saying that we need a better architecture, and Stef and Eliot are correct saying that we need tools that fulfill usersâ needs. And we have to say: âok now we hack this around, but we have to do this the right way one dayâ. Is anyone familiar with same-css[1] concept? Uko P.S. maybe my 2 cents are useless, but all the fight around this discussion is really strange for me. In Ukraine we have a saying that itâs better to be healthy and poor than sick and rich. Now I use to say that itâs better to be healthy and rich than sick and poor. And all the fight here was if itâs better to be healthy or rich. Definitely itâs better to be both, we cannot do that instantly but we can set goals and milestones, and find the optimal strategy. [1]: http://csswizardry.com/2013/04/shame-css/ > On 09 May 2015, at 16:17, Eliot Miranda <eliot.miranda(a)gmail.com> wrote: > > > > On Sat, May 9, 2015 at 5:29 AM, stepharo <stepharo(a)free.fr <mailto:stepharo@free.fr>> wrote: > Eliot > > I changed the transcript because it is not thread safe so I could use it at all to explain concurrent programming output. > It was terrible. > > I don't see what that has to do with my usability point. The transcript was > a) a stream > b) something that displayed its output immediately > > Those two features are essential. If you change the transcript so that it no longer has those features you have broken it. > > Igor waffled on about internals, the desire to separate the UI from the stream, a point that has nothing to do with the utility of the transcript. No you're going on about its thread-safety. But no one is addressing my point. And you have ClÃ©ment telling you that he cannot develop the VM in Pharo because the transcript is broken, and you have others proposing various potentially error-prone work-arounds to get around the fact that the transcript is broken. > > Why won't anyone stand up and say yes, the transcript is broken and yes we will fix it? This is dysfunctional. > > > Stef > > > Le 8/5/15 16:16, Eliot Miranda a Ã©crit : > > Hi, > > if one uses a at doit transcript then no special action is required to get output to appear beyond sending flush to Transcript right? So any solution that requires special action to get the moronic transcript to work us broken. We should fix the transcript, not expect every application to work around a bug. > > Eliot (phone) > > On May 8, 2015, at 6:15 AM, Alain Rastoul <alf.mmm.cat(a)gmail.com <mailto:alf.mmm.cat@gmail.com>> wrote: > > Le 08/05/2015 11:34, stepharo a Ã©crit : > Hi guys > > the Transcript in Pharo is that it's not asynchronous so I can't use it > in VM development to show the current progress of the simulation. For > example: > 1 to: 100 do: [ :i | > 0.1 seconds asDelay wait. > Transcript show: 'x'. ] > => on Squeak, this shows a x every 0.1 second in the Transcript > => on Pharo, nothing happens during 10 seconds then all the x are shown. > > https://pharo.fogbugz.com/default.asp?15515 <https://pharo.fogbugz.com/default.asp?15515> > Yes, as do it are evaluated in the World morphic process, running in a forked process or sending World doOneCycle in the loop solve the problem. > > Probably in squeak, in Transcript this is done somewhere under the hood. > > via dependents ? > > TranscriptStream>>endEndtry > "Display all the characters since the last endEntry, and reset the stream" > self semaphore critical:[ > self changed: #appendEntry. > self reset. > ]. > > Object>>changed: aParameter > self dependents do: [:aDependent | aDependent update: aParameter] > > And probably not doOnecycle since you cannot do anything else during execution (clicking or moving windows). > > > -- > Regards, > > Alain > > > > > > > > > > -- > best, > Eliot

May 9, 2015

Re: [Pharo-dev] Transcript needs your love

by Nicolai Hess

2015-05-09 20:16 GMT+02:00 ClÃ©ment Bera <bera.clement(a)gmail.com>: > > Stef believes it is important that Pharo is able to host development for > its own VM. Therefore, I discussed with him and Esteban about a first list > of points that are necessary for Pharo to support its VM development in > Pharo, which includes this Transcript behavior. > > Can you share this list of points, please. I am interested in this. nicolai

May 9, 2015

Re: [Pharo-dev] [Review]: Issue 13159: ListDialogWindow - Grow Width to Fit List

by Nicolai Hess

2015-05-09 22:08 GMT+02:00 Sean P. DeNigris <sean(a)clipperadams.com>: > https://pharo.fogbugz.com/default.asp?13159 > > Right now, it doesn't do a very good job of sizing itself. See the > screenshot below of the Metacello Configuration Browsers "Switch > Repository" > dialog. The width is insufficient for the tool to be resizable without > first > manually resizing. > > <http://forum.world.st/file/n4825490/Screenshot_2015-05-09_09.png> > > Fix in inbox, validated by monkey: > SLICE-Issue-13159-ListDialogWindow---Grow-Width-to-Fit-List-SeanDeNigris.1 > - Keep extent relatively consistent with the contained list morph > > > Does not work well in all situations (-> https://pharo.fogbugz.com/default.asp?13159#BugEvent.126933) Maybe optimal extent should be at least as large as the initial extent. And when the dialog opens in its inital extent it shortly afterward resizes. This short and sudden change looks strange. > > ----- > Cheers, > Sean > -- > View this message in context: > http://forum.world.st/Review-Issue-13159-ListDialogWindow-Grow-Width-to-Fit… > Sent from the Pharo Smalltalk Developers mailing list archive at > Nabble.com. > >

May 9, 2015

Re: [Pharo-dev] GanttChartMorph openOn: aCollectionOfActivities ?

by H. Hirzel

Thank you for the examples, Alexandre! I have Pharo 4.0 with Roassal 2.0 installed (AlexandreBergel.718) I paste the following into a 'Playground' window and 'do it'. b := RTTimeLine new. b addEntry: (RTTimeLineEntry new identifier: #WP1; start: 0; end: 5). b addEntry: (RTTimeLineEntry new identifier: #WP2; start: 5; end: 8). b addEntry: (RTTimeLineEntry new identifier: #WP3; start: 7; end: 10). b axisX numberOfLabels: 5. b I get the error message that RTTimeLine is not known. What am I missing? --Hannes On 5/8/15, Alexandre Bergel <alexandre.bergel(a)me.com> wrote: > Hi Hannes! > > Here is a first shoot paired-programmed with Juraj using Roassal: > > -=-=-=-=-=-=-=-=-=-=-=-= > b := RTTimeLine new. > > b addEntry: (RTTimeLineEntry new identifier: #WP1; start: 0; end: 5). > b addEntry: (RTTimeLineEntry new identifier: #WP2; start: 5; end: 8). > b addEntry: (RTTimeLineEntry new identifier: #WP3; start: 7; end: 10). > > b axisX numberOfLabels: 5. > b > -=-=-=-=-=-=-=-=-=-=-=-= > > > > Here some slightly more elaborated example: > > -=-=-=-=-=-=-=-=-=-=-=-= > âOne color per entry" > | b d | > b := RTTimeLine new. > b addEntry: (RTTimeLineEntry new identifier: #c1; start: 0; end: 5). > b addEntry: (RTTimeLineEntry new identifier: #c1; start: 6; end: 8). > > b addEntry: (RTTimeLineEntry new identifier: #c2; start: 0; end: 5). > b addEntry: (RTTimeLineEntry new identifier: #c2; start: 8; end: 10). > > b addEntry: (RTTimeLineEntry new identifier: #c3; start: 0; end: 10). > > b addEntry: (RTTimeLineEntry new identifier: #c4; start: 5; end: 10). > > b addEntry: (RTTimeLineEntry new identifier: #c5; start: 5; end: 8). > > d := RTVerticalTickLineDecorator new. > d shape line color: Color white. > b addDecorator: d. > b axisX > numberOfLabels: 5; > labelRotation: -45; > labelConversion: [ :v | Date year: 2015 day: v ]. > > b shape color: (RTMultiLinearColorForIdentity new objects: b entries). > b > -=-=-=-=-=-=-=-=-=-=-=-= > > > > One color per timeline > > > -=-=-=-=-=-=-=-=-=-=-=-= > | b | > b := RTTimeLine new. > b addEntry: (RTTimeLineEntry new identifier: #c1; start: 0; end: 5). > b addEntry: (RTTimeLineEntry new identifier: #c1; start: 6; end: 8). > > b addEntry: (RTTimeLineEntry new identifier: #c2; start: 0; end: 5). > b addEntry: (RTTimeLineEntry new identifier: #c2; start: 8; end: 10). > > b addEntry: (RTTimeLineEntry new identifier: #c3; start: 0; end: 10). > > b addEntry: (RTTimeLineEntry new identifier: #c4; start: 5; end: 10). > > b addEntry: (RTTimeLineEntry new identifier: #c5; start: 5; end: 8). > > d := RTVerticalTickLineDecorator new. > d shape line color: Color white. > b addDecorator: d. > b axisX > numberOfLabels: 5; > labelRotation: -45; > labelConversion: [ :v | Date year: 2015 day: v ]. > > b shape color: (RTMultiLinearColorForIdentity new command: #identifier; > objects: #(c1 c2 c3 c4 c5)). > b > -=-=-=-=-=-=-=-=-=-=-=-= > > > Age of some classes: > -=-=-=-=-=-=-=-=-=-=-=-= > | b | > b := RTTimeLine new. > b extent: 500 @ 500. > ((RTShape withAllSubclasses sortedAs: #ageInDaysRounded) select: > #hasMethods) > do: [ :cls | > e := RTTimeLineEntry new. > e identifier: cls. > e start: cls computeYoungestMethod ageInDays. > e end: cls computeOldestMethod ageInDays. > b addEntry: e ]. > b > -=-=-=-=-=-=-=-=-=-=-=-= > > > > All these examples are in the Roassal time line example menu. > > This is still an early version. Let us know how it goes! > https://www.facebook.com/ObjectProfile/posts/840542572699008 > > Cheers, > Alexandre > > -- > _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: > Alexandre Bergel http://www.bergel.eu > ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. > > > >> On May 7, 2015, at 4:25 PM, H. Hirzel <hannes.hirzel(a)gmail.com> wrote: >> >> Hello >> >> Has somebody done a GANTT chart? >> >> GanttChartMorph openOn: aCollectionOfActivities >> >> ? >> >> Activities have >> - id >> - description >> - start date >> - end date >> ? >> >> Regards >> >> Hannes >> > >

May 9, 2015

Re: [Pharo-dev] A fast Transcript

by Tudor Girba

Hi Eliot, Just a question: Could you describe the situations when you need to have the Transcript editable? I am not trying to provoke you, but to understand use cases. While working on GT I found that it is often possible to support the same use cases with multiple UI solutions. And sometimes considering alternatives leads to interesting results. Cheers, Doru On Sat, May 9, 2015 at 9:32 PM, Eliot Miranda <eliot.miranda(a)gmail.com> wrote: > Hi Juan, > > I see that your new transcript is indeed much faster but is also not > editable. I wonder if it would be possible to have the best of both worlds > and arrange that, when active, the transcript is editable. For example, > selecting the TranscriptWIndow could put it into a mode where the > transcript's state was imported into a more conventional editable text > morph, and then when the window was exited, reverted to the standard fast > output mode. As you can infer I like having an editable transcript. I can > do without it, because Squeak's slow transcript is indeed a PITA, but I'm > not sure that speed need preclude editability. > > On Sat, May 9, 2015 at 10:17 AM, J. Vuletich (mail lists) < > juanlists(a)jvuletich.org> wrote: > >> Hi Folks, >> >> (below) >> >> >> Quoting Ben Coman <btc(a)openinworld.com>: >> >> On Sat, May 9, 2015 at 10:35 PM, Eliot Miranda <eliot.miranda(a)gmail.com> >>> wrote: >>> >>> >>>> >>>> On Sat, May 9, 2015 at 7:09 AM, Ben Coman <btc(a)openinworld.com> wrote: >>>> >>>> From my limited experience bug hunting, calling #changed: from a thread >>>>> other than the UI thread is a source of evil. There are too many >>>>> assumptions throughout the system that the UI is single threaded. Can >>>>> anyone advise me that is not a proper belief? >>>>> >>>>> Then that implies that a Transcript implementation where #nextPut: >>>>> direct >>>>> calls #changed: >>>>> is not appropriate for use with multi-threaded applications. In Pharo, >>>>> #changed: is only called from #stepGlobal, which is called from >>>>> doOneCycle:. (This came about as a last minute bug fix before Pharo 3 >>>>> release and maybe could use some cleanup. >>>>> >>>>> Separating the UI from Transcript into its own viewer might be a good >>>>> idea, but actually it would not solve Stef's case since his code would >>>>> still be running in the UI thread -- unless the viewer ran in another >>>>> thread, which would have its own complexities. >>>>> >>>>> I think the point about efficiency is significant. The following >>>>> example... >>>>> Time millisecondsToRun: [ 1000 timesRepeat: [ Transcript show: >>>>> 'x' >>>>> ] ] >>>>> on Squeak 4.5 --> 12749ms >>>>> on Pharo 50029 --> 2ms >>>>> >>>>> This better performance helped me a lot trying to understand the high >>>>> priority timerEventLoop being able to indiscriminately scatter >>>>> Transcript >>>>> tracing through that code. I believe its also probably beneficial for >>>>> working with externally triggered semaphores and timing sensitive race >>>>> conditions. >>>>> >>>>> So we have two mutually exclusive cases: >>>>> * better interactivity, poorer system performance >>>>> * faster system performance, worse interactivity >>>>> >>>>> Which of these is broken depends on your viewpoint. >>>>> >>>>> >>>> Something that runs fast but is incorrect is still incorrect. The fact >>>> that the transcript doesn't output until a world step is possible is a >>>> bug. It forces programs that use the transcript to be rewritten in >>>> order >>>> to see transcript output. >>>> >>>> >>> As a point of comparison for correctness, for the following... >>> >>> Transcript clear. >>> [ $a asciiValue to: $z asciiValue do: [ :c | >>> [ 1 to: 9 do: [ :i | Transcript show: c asCharacter printString , i >>> printString , ' ' ] ] forkAt: 40 >>> ]. >>> ] forkAt: 41 >>> >>> Squeak 4.5 gives... >>> $a1 $a2 $a3 $a4 $a5 $a6 $a7 $a8 $a9 $b1 $b2 $b3 $b4 $b5 $b5 $c1 $c2 $c3 >>> $c4 >>> $c5 $c6 $c7 $c8 $c9 $d1 $d2 $d3 $d4 $d5 $d6 $d7 $d8 $d9 $d9 $e2 $g2 $h2 >>> $h2 >>> $i2 $k2 $k2 $l2 $n2 $n2 $o2 $o2 $r2 $s2 $t2 $u2 $u2 $v2 $x2 $y2 $z2 $z2 >>> $b7 >>> $f3 $e3 $e3 $g3 $j3 $h3 $i3 $k3 $k3 $m3 $n3 $p3 $p3 $q3 $o3 $s3 $t3 $t3 >>> $u3 >>> $v3 $x3 $y3 $z3 $b8 $f4 $e4 $e4 $g4 $h4 $i4 $k4 $l4 $m4 $m4 $n4 $r4 $q4 >>> $o4 >>> $o4 $s4 $w4 $u4 $u4 $v4 $y4 $y4 $z4 $z4 $f5 $j5 $j5 $g5 $i5 $k5 $l5 $l5 >>> $m5 >>> $m5 $n5 $q5 $o5 $s5 $s5 $t5 $u5 $u5 $x5 $y5 $z5 $f6 $f6 $h6 $h6 $g6 $g6 >>> $k6 >>> $p6 $m6 $r6 $r6 $n6 $o6 $s6 $s6 $w6 $u6 $x6 $x6 $e7 $f7 $j7 $h7 $h7 $i7 >>> $l7 >>> $l7 $k7 $m7 $m7 $q7 $n7 $n7 $o7 $t7 $w7 $w7 $u7 $v7 $x7 $z7 $z7 $e8 $e8 >>> $h8 >>> $g8 $i8 $i8 $l8 $k8 $k8 $m8 $q8 $n8 $n8 $s8 $t8 $w8 $y8 $y8 $u8 $x8 $z8 >>> $f9 >>> $f9 $e9 $h9 $h9 $g9 $p9 $p9 $k9 $r9 $r9 $m9 $n9 $n9 $o9 $t9 $t9 $w9 $v9 >>> $u9 >>> $u9 $z9 $x9 >>> >>> Pharo 50041 gives... >>> $a1 $a2 $a3 $a4 $a5 $a6 $a7 $a8 $a9 $b1 $b2 $b3 $b4 $b5 $b6 $b7 $b8 $b9 >>> $c1 >>> $c2 $c3 $c4 $c5 $c6 $c7 $c8 $c9 $d1 $d2 $d3 $d4 $d5 $d6 $d7 $d8 $d9 $e1 >>> $e2 >>> $e3 $e4 $e5 $e6 $e7 $e8 $e9 $f1 $f2 $f3 $f4 $f5 $f6 $f7 $f8 $f9 $g1 $g2 >>> $g3 >>> $g4 $g5 $g6 $g7 $g8 $g9 $h1 $h2 $h3 $h4 $h5 $h6 $h7 $h8 $h9 $i1 $i2 $i3 >>> $i4 >>> $i5 $i6 $i7 $i8 $i9 $j1 $j2 $j3 $j4 $j5 $j6 $j7 $j8 $j9 $k1 $k2 $k3 $k4 >>> $k5 >>> $k6 $k7 $k8 $k9 $l1 $l2 $l3 $l4 $l5 $l6 $l7 $l8 $l9 $m1 $m2 $m3 $m4 $m5 >>> $m6 >>> $m7 $m8 $m9 $n1 $n2 $n3 $n4 $n5 $n6 $n7 $n8 $n9 $o1 $o2 $o3 $o4 $o5 $o6 >>> $o7 >>> $o8 $o9 $p1 $p2 $p3 $p4 $p5 $p6 $p7 $p8 $p9 $q1 $q2 $q3 $q4 $q5 $q6 $q7 >>> $q8 >>> $q9 $r1 $r2 $r3 $r4 $r5 $r6 $r7 $r8 $r9 $s1 $s2 $s3 $s4 $s5 $s6 $s7 $s8 >>> $s9 >>> $t1 $t2 $t3 $t4 $t5 $t6 $t7 $t8 $t9 $u1 $u2 $u3 $u4 $u5 $u6 $u7 $u8 $u9 >>> $v1 >>> $v2 $v3 $v4 $v5 $v6 $v7 $v8 $v9 $w1 $w2 $w3 $w4 $w5 $w6 $w7 $w8 $w9 $x1 >>> $x2 >>> $x3 $x4 $x5 $x6 $x7 $x8 $x9 $y1 $y2 $y3 $y4 $y5 $y6 $y7 $y8 $y9 $z1 $z2 >>> $z3 >>> $z4 $z5 $z6 $z7 $z8 $z9 >>> >>> (start your comparison at $b5) >>> >>> So in one axis Pharo has improved Transcript, but we didn't notice the >>> significance of the use case we lost. >>> >>> cheers -ben >>> >> >> Please take a good look at Cuis' Transcript and consider using it. >> >> By default, the display is updated immediately, but without calling >> Morphic, it can even work with no UI framework at all. It does updates >> faster than Squeak or Visualworks: >> >> Time millisecondsToRun: [ 1000 timesRepeat: [ Transcript show: >> 'x' ] ]. 763. >> >> But if you want minimum overhead without immediate feedback: >> >> Time millisecondsToRun: [ Transcript showOnDisplay: false. 1000 >> timesRepeat: [ Transcript show: 'x' ]. Transcript showOnDisplay: true ]. 1. >> "As fast as Pharo" >> >> It is also thread safe, and for Ben's example: >> >> Transcript clear. >> [ >> $a asciiValue to: $z asciiValue do: [ :c | >> [ 1 to: 9 do: [ :i | Transcript show: c asCharacter >> printString , i printString , ' ' ] ] forkAt: 40 >> ]. >> ] forkAt: 41 >> >> it gives the same result as Pharo. >> >> The fact that the updates are not bound to Morphic also means that it is >> possible to do #show: deep in Morphic logic, without causing infinite loops >> or recursions, and get immediate feedback. It has proved to be a useful aid >> in debugging Morphic code. >> >> Cheers, >> Juan Vuletich >> >> >> > > > -- > best, > Eliot > -- www.tudorgirba.com "Every thing has its own flow"

May 9, 2015

Re: [Pharo-dev] Transcript needs your love

by Tudor Girba

I do not think there are many people around here that would think that it is irrelevant if the Pharo VM can be developed in Pharo or not. Of course, it is important. So, the discussion should not go to challenge this direction, but rather in you telling us the use cases that you need supported. Please note that I did not say which exact code and how it should look like. I would be interested in learning about the use cases you have. I am quite certain that there are a number of ways to support them and when we work on GT it would be useful to have your use cases on our table. Cheers, Doru On Sat, May 9, 2015 at 9:31 PM, ClÃ©ment Bera <bera.clement(a)gmail.com> wrote: > > > 2015-05-09 20:25 GMT+02:00 stepharo <stepharo(a)free.fr>: > >> >> >> Le 9/5/15 20:16, ClÃ©ment Bera a Ã©crit : >> >> This whole conversation here shows very well the point that I tried to >> explain to Stef last week. I'm sorry if the mail is a bit long but I think >> this discussion has to be done. >> >> My whole Smalltalk development life, I have used Pharo and was happy >> with it. Now I am also working in Cog's JIT compiler and for this specific >> project, I am working with Squeak. I don't work with Squeak because I don't >> like Pharo, I told you before, I have worked with Pharo on all my project >> before, enjoyed it and if it was possible I would use Pharo. I work with >> Squeak because the VM development tool and development process simply does >> *not* work in Pharo. This is not only because of VM tools working with the >> old Morphic not working anymore in Pharo or details like that, it is also >> due to deeper changes in Pharo. >> >> Stef believes it is important that Pharo is able to host development >> for its own VM. Therefore, I discussed with him and Esteban about a first >> list of points that are necessary for Pharo to support its VM development >> in Pharo, which includes this Transcript behavior. >> >> As of today, and I am honest here, I believe that what is required for >> Pharo to support the development process of its VM includes points which >> goes in the opposite direction than a few points in the Pharo roadmap, that >> people in the Pharo community will see as a regression, as "an intrusion >> from the Squeak philosophy into Pharo", or as forbidding the integration of >> features that breaks the VM development process. Therefore, I believe the >> Pharo community would disapprove to make such changes and I highly doubt >> that it is possible to have the development process of the >> Pharo VM in Pharo. >> >> I was thinking that only a few points would be a problem such as the >> increasing memory footprint of the Pharo image that is going to get worse >> with the sources that will be included in the image in the future, whereas >> a VM developer needs a small image (See previous threads in this mailing >> list where Hilaire complains about that for example). >> >> >> clement can I ask a simple question? >> why did I ask guille to work on minikernels and bootstrap for his phd >> instead on a topic where we can publish? >> - choice A: lack of idea >> - choice B: .... >> > > I have already stated that you believe that it is important that Pharo is > able to host development for its own VM. > > I am not against what you did and I am very excited with Guille's work. > > Pharo is community-driven, so I am not asking the question to you only, > but to the community. > >> >> >> However, I didn't think that even simple points like the Transcript >> behavior discussed here, which looks like to me as a regression and is >> required for VM development, would be seen as an improvement by a non >> negligible part of the community. >> >> In this mailing-list, the whole Pharo community is present and can see >> this discussion. So the open questions are: >> >> *Do you want to have the development of the Pharo VM in Pharo, or do >> you want the development of the Pharo VM to remain in Squeak ?* >> *Do you think a system that is not good enough to handle its own VM >> development is a good system ?* >> >> I am not willing to go against the will of the community because I >> enjoy community-driven softwares. If the answer is that Pharo should be >> able to support its own VM development then as I started I will help >> Esteban and Stef to improve Pharo so that it can support its own VM >> development. Now, if the answer is that the development of the Pharo VM >> should remain in Squeak, I will continue developing the VM in Squeak. >> >> You are the Pharo community, you are the ones that make Pharo alive and >> kicking, so you tell me what you think we should do. >> >> Clement >> >> 2015-05-09 18:23 GMT+02:00 Eliot Miranda <eliot.miranda(a)gmail.com>: >> >>> Hi Ben, >>> >>> On May 9, 2015, at 7:41 AM, Ben Coman <btc(a)openinworld.com> wrote: >>> >>> >>> >>> On Sat, May 9, 2015 at 10:09 PM, Ben Coman <btc(a)openinworld.com> wrote: >>> >>>> From my limited experience bug hunting, calling #changed: from a thread >>>> other than the UI thread is a source of evil. There are too many >>>> assumptions throughout the system that the UI is single threaded. Can >>>> anyone advise me that is not a proper belief? >>>> >>>> Then that implies that a Transcript implementation where #nextPut: >>>> direct calls #changed: >>>> is not appropriate for use with multi-threaded applications. In Pharo, >>>> #changed: is only called from #stepGlobal, which is called from >>>> doOneCycle:. (This came about as a last minute bug fix before Pharo 3 >>>> release and maybe could use some cleanup. >>>> >>>> Separating the UI from Transcript into its own viewer might be a good >>>> idea, but actually it would not solve Stef's case since his code would >>>> still be running in the UI thread -- unless the viewer ran in another >>>> thread, which would have its own complexities. >>>> >>>> I think the point about efficiency is significant. The following >>>> example... >>>> Time millisecondsToRun: [ 1000 timesRepeat: [ Transcript show: >>>> 'x' ] ] >>>> on Squeak 4.5 --> 12749ms >>>> on Pharo 50029 --> 2ms >>>> >>> >>> As a point of comparison, on VW 8.0 --> 43817ms >>> and so you might guess, VW 8.0 outputs each 'x' immediately. >>> cheers -ben >>> >>> >>> Way to go, Squeak! Actually this is disappointing. I'm rather >>> frustrated with Squeak's slow transcript, and was hoping that VW would >>> demonstrate it could be faster. Looking at the Squeak implementation I >>> only see an obvious 30% or so improvement via tuning. Looks like good >>> performance will take more work :-/ >>> >>> >>> >>> Eliot (phone) >>> >> >> >> > -- www.tudorgirba.com "Every thing has its own flow"

May 9, 2015

Re: [Pharo-dev] A fast Transcript

by J. Vuletich (mail lists)

Hi Eliot, Yes, it is not editable. The approach you describe is a good idea. There are a few details to take care, like that the Cuis Transcript doesn't do wordwrap, and that's why it can work without the usual text editor machinery. So, maybe this editable Transcript should do no wordwrap, and have an horizontal scrollbar. Most likely there would be 2 models, one like the one in Cuis, that is just a collection of lines, and another that is a regular text model. So those would need to be sync'ed, etc. But it can be done and it would be great. Cheers, Juan Vuletich Quoting Eliot Miranda <eliot.miranda(a)gmail.com>: > Hi Juan, > > I see that your new transcript is indeed much faster but is also not > editable. I wonder if it would be possible to have the best of both worlds > and arrange that, when active, the transcript is editable. For example, > selecting the TranscriptWIndow could put it into a mode where the > transcript's state was imported into a more conventional editable text > morph, and then when the window was exited, reverted to the standard fast > output mode. As you can infer I like having an editable transcript. I can > do without it, because Squeak's slow transcript is indeed a PITA, but I'm > not sure that speed need preclude editability. > > On Sat, May 9, 2015 at 10:17 AM, J. Vuletich (mail lists) < > juanlists(a)jvuletich.org> wrote: > >> Hi Folks, >> >> (below) >> >> >> Quoting Ben Coman <btc(a)openinworld.com>: >> >> On Sat, May 9, 2015 at 10:35 PM, Eliot Miranda <eliot.miranda(a)gmail.com> >>> wrote: >>> >>> >>>> >>>> On Sat, May 9, 2015 at 7:09 AM, Ben Coman <btc(a)openinworld.com> wrote: >>>> >>>> From my limited experience bug hunting, calling #changed: from a thread >>>>> other than the UI thread is a source of evil. There are too many >>>>> assumptions throughout the system that the UI is single threaded. Can >>>>> anyone advise me that is not a proper belief? >>>>> >>>>> Then that implies that a Transcript implementation where #nextPut: >>>>> direct >>>>> calls #changed: >>>>> is not appropriate for use with multi-threaded applications. In Pharo, >>>>> #changed: is only called from #stepGlobal, which is called from >>>>> doOneCycle:. (This came about as a last minute bug fix before Pharo 3 >>>>> release and maybe could use some cleanup. >>>>> >>>>> Separating the UI from Transcript into its own viewer might be a good >>>>> idea, but actually it would not solve Stef's case since his code would >>>>> still be running in the UI thread -- unless the viewer ran in another >>>>> thread, which would have its own complexities. >>>>> >>>>> I think the point about efficiency is significant. The following >>>>> example... >>>>> Time millisecondsToRun: [ 1000 timesRepeat: [ Transcript show: 'x' >>>>> ] ] >>>>> on Squeak 4.5 --> 12749ms >>>>> on Pharo 50029 --> 2ms >>>>> >>>>> This better performance helped me a lot trying to understand the high >>>>> priority timerEventLoop being able to indiscriminately scatter >>>>> Transcript >>>>> tracing through that code. I believe its also probably beneficial for >>>>> working with externally triggered semaphores and timing sensitive race >>>>> conditions. >>>>> >>>>> So we have two mutually exclusive cases: >>>>> * better interactivity, poorer system performance >>>>> * faster system performance, worse interactivity >>>>> >>>>> Which of these is broken depends on your viewpoint. >>>>> >>>>> >>>> Something that runs fast but is incorrect is still incorrect. The fact >>>> that the transcript doesn't output until a world step is possible is a >>>> bug. It forces programs that use the transcript to be rewritten in order >>>> to see transcript output. >>>> >>>> >>> As a point of comparison for correctness, for the following... >>> >>> Transcript clear. >>> [ $a asciiValue to: $z asciiValue do: [ :c | >>> [ 1 to: 9 do: [ :i | Transcript show: c asCharacter printString , i >>> printString , ' ' ] ] forkAt: 40 >>> ]. >>> ] forkAt: 41 >>> >>> Squeak 4.5 gives... >>> $a1 $a2 $a3 $a4 $a5 $a6 $a7 $a8 $a9 $b1 $b2 $b3 $b4 $b5 $b5 $c1 $c2 $c3 >>> $c4 >>> $c5 $c6 $c7 $c8 $c9 $d1 $d2 $d3 $d4 $d5 $d6 $d7 $d8 $d9 $d9 $e2 $g2 $h2 >>> $h2 >>> $i2 $k2 $k2 $l2 $n2 $n2 $o2 $o2 $r2 $s2 $t2 $u2 $u2 $v2 $x2 $y2 $z2 $z2 >>> $b7 >>> $f3 $e3 $e3 $g3 $j3 $h3 $i3 $k3 $k3 $m3 $n3 $p3 $p3 $q3 $o3 $s3 $t3 $t3 >>> $u3 >>> $v3 $x3 $y3 $z3 $b8 $f4 $e4 $e4 $g4 $h4 $i4 $k4 $l4 $m4 $m4 $n4 $r4 $q4 >>> $o4 >>> $o4 $s4 $w4 $u4 $u4 $v4 $y4 $y4 $z4 $z4 $f5 $j5 $j5 $g5 $i5 $k5 $l5 $l5 >>> $m5 >>> $m5 $n5 $q5 $o5 $s5 $s5 $t5 $u5 $u5 $x5 $y5 $z5 $f6 $f6 $h6 $h6 $g6 $g6 >>> $k6 >>> $p6 $m6 $r6 $r6 $n6 $o6 $s6 $s6 $w6 $u6 $x6 $x6 $e7 $f7 $j7 $h7 $h7 $i7 >>> $l7 >>> $l7 $k7 $m7 $m7 $q7 $n7 $n7 $o7 $t7 $w7 $w7 $u7 $v7 $x7 $z7 $z7 $e8 $e8 >>> $h8 >>> $g8 $i8 $i8 $l8 $k8 $k8 $m8 $q8 $n8 $n8 $s8 $t8 $w8 $y8 $y8 $u8 $x8 $z8 >>> $f9 >>> $f9 $e9 $h9 $h9 $g9 $p9 $p9 $k9 $r9 $r9 $m9 $n9 $n9 $o9 $t9 $t9 $w9 $v9 >>> $u9 >>> $u9 $z9 $x9 >>> >>> Pharo 50041 gives... >>> $a1 $a2 $a3 $a4 $a5 $a6 $a7 $a8 $a9 $b1 $b2 $b3 $b4 $b5 $b6 $b7 $b8 $b9 >>> $c1 >>> $c2 $c3 $c4 $c5 $c6 $c7 $c8 $c9 $d1 $d2 $d3 $d4 $d5 $d6 $d7 $d8 $d9 $e1 >>> $e2 >>> $e3 $e4 $e5 $e6 $e7 $e8 $e9 $f1 $f2 $f3 $f4 $f5 $f6 $f7 $f8 $f9 $g1 $g2 >>> $g3 >>> $g4 $g5 $g6 $g7 $g8 $g9 $h1 $h2 $h3 $h4 $h5 $h6 $h7 $h8 $h9 $i1 $i2 $i3 >>> $i4 >>> $i5 $i6 $i7 $i8 $i9 $j1 $j2 $j3 $j4 $j5 $j6 $j7 $j8 $j9 $k1 $k2 $k3 $k4 >>> $k5 >>> $k6 $k7 $k8 $k9 $l1 $l2 $l3 $l4 $l5 $l6 $l7 $l8 $l9 $m1 $m2 $m3 $m4 $m5 >>> $m6 >>> $m7 $m8 $m9 $n1 $n2 $n3 $n4 $n5 $n6 $n7 $n8 $n9 $o1 $o2 $o3 $o4 $o5 $o6 >>> $o7 >>> $o8 $o9 $p1 $p2 $p3 $p4 $p5 $p6 $p7 $p8 $p9 $q1 $q2 $q3 $q4 $q5 $q6 $q7 >>> $q8 >>> $q9 $r1 $r2 $r3 $r4 $r5 $r6 $r7 $r8 $r9 $s1 $s2 $s3 $s4 $s5 $s6 $s7 $s8 >>> $s9 >>> $t1 $t2 $t3 $t4 $t5 $t6 $t7 $t8 $t9 $u1 $u2 $u3 $u4 $u5 $u6 $u7 $u8 $u9 >>> $v1 >>> $v2 $v3 $v4 $v5 $v6 $v7 $v8 $v9 $w1 $w2 $w3 $w4 $w5 $w6 $w7 $w8 $w9 $x1 >>> $x2 >>> $x3 $x4 $x5 $x6 $x7 $x8 $x9 $y1 $y2 $y3 $y4 $y5 $y6 $y7 $y8 $y9 $z1 $z2 >>> $z3 >>> $z4 $z5 $z6 $z7 $z8 $z9 >>> >>> (start your comparison at $b5) >>> >>> So in one axis Pharo has improved Transcript, but we didn't notice the >>> significance of the use case we lost. >>> >>> cheers -ben >>> >> >> Please take a good look at Cuis' Transcript and consider using it. >> >> By default, the display is updated immediately, but without calling >> Morphic, it can even work with no UI framework at all. It does updates >> faster than Squeak or Visualworks: >> >> Time millisecondsToRun: [ 1000 timesRepeat: [ Transcript show: >> 'x' ] ]. 763. >> >> But if you want minimum overhead without immediate feedback: >> >> Time millisecondsToRun: [ Transcript showOnDisplay: false. 1000 >> timesRepeat: [ Transcript show: 'x' ]. Transcript showOnDisplay: true ]. 1. >> "As fast as Pharo" >> >> It is also thread safe, and for Ben's example: >> >> Transcript clear. >> [ >> $a asciiValue to: $z asciiValue do: [ :c | >> [ 1 to: 9 do: [ :i | Transcript show: c asCharacter >> printString , i printString , ' ' ] ] forkAt: 40 >> ]. >> ] forkAt: 41 >> >> it gives the same result as Pharo. >> >> The fact that the updates are not bound to Morphic also means that it is >> possible to do #show: deep in Morphic logic, without causing infinite loops >> or recursions, and get immediate feedback. It has proved to be a useful aid >> in debugging Morphic code. >> >> Cheers, >> Juan Vuletich >> >> >> > > > -- > best, > Eliot

May 9, 2015

Re: [Pharo-dev] Transcript needs your love

by J. Vuletich (mail lists)

Hi Eliot, Yes, that's the active repo, and that's latest commit. You might also take a look at the packages folder. Not related to Transcript, but there is a lot of good stuff in there. Cheers, Juan Vuletich Quoting Eliot Miranda <eliot.miranda(a)gmail.com>: > Hi Juan, > > > > I'm cloning https://github.com/Cuis-Smalltalk/Cuis-Smalltalk-Dev and > will take a look at Cuis4.2-2280. Is that right? > > On Sat, May 9, 2015 at 10:17 AM, J. Vuletich (mail lists) < > juanlists(a)jvuletich.org> wrote: > >> Hi Folks, >> >> (below) >> >> >> Quoting Ben Coman <btc(a)openinworld.com>: >> >> On Sat, May 9, 2015 at 10:35 PM, Eliot Miranda <eliot.miranda(a)gmail.com> >>> wrote: >>> >>> >>>> >>>> On Sat, May 9, 2015 at 7:09 AM, Ben Coman <btc(a)openinworld.com> wrote: >>>> >>>> From my limited experience bug hunting, calling #changed: from a thread >>>>> other than the UI thread is a source of evil. There are too many >>>>> assumptions throughout the system that the UI is single threaded. Can >>>>> anyone advise me that is not a proper belief? >>>>> >>>>> Then that implies that a Transcript implementation where #nextPut: >>>>> direct >>>>> calls #changed: >>>>> is not appropriate for use with multi-threaded applications. In Pharo, >>>>> #changed: is only called from #stepGlobal, which is called from >>>>> doOneCycle:. (This came about as a last minute bug fix before Pharo 3 >>>>> release and maybe could use some cleanup. >>>>> >>>>> Separating the UI from Transcript into its own viewer might be a good >>>>> idea, but actually it would not solve Stef's case since his code would >>>>> still be running in the UI thread -- unless the viewer ran in another >>>>> thread, which would have its own complexities. >>>>> >>>>> I think the point about efficiency is significant. The following >>>>> example... >>>>> Time millisecondsToRun: [ 1000 timesRepeat: [ Transcript show: 'x' >>>>> ] ] >>>>> on Squeak 4.5 --> 12749ms >>>>> on Pharo 50029 --> 2ms >>>>> >>>>> This better performance helped me a lot trying to understand the high >>>>> priority timerEventLoop being able to indiscriminately scatter >>>>> Transcript >>>>> tracing through that code. I believe its also probably beneficial for >>>>> working with externally triggered semaphores and timing sensitive race >>>>> conditions. >>>>> >>>>> So we have two mutually exclusive cases: >>>>> * better interactivity, poorer system performance >>>>> * faster system performance, worse interactivity >>>>> >>>>> Which of these is broken depends on your viewpoint. >>>>> >>>>> >>>> Something that runs fast but is incorrect is still incorrect. The fact >>>> that the transcript doesn't output until a world step is possible is a >>>> bug. It forces programs that use the transcript to be rewritten in order >>>> to see transcript output. >>>> >>>> >>> As a point of comparison for correctness, for the following... >>> >>> Transcript clear. >>> [ $a asciiValue to: $z asciiValue do: [ :c | >>> [ 1 to: 9 do: [ :i | Transcript show: c asCharacter printString , i >>> printString , ' ' ] ] forkAt: 40 >>> ]. >>> ] forkAt: 41 >>> >>> Squeak 4.5 gives... >>> $a1 $a2 $a3 $a4 $a5 $a6 $a7 $a8 $a9 $b1 $b2 $b3 $b4 $b5 $b5 $c1 $c2 $c3 >>> $c4 >>> $c5 $c6 $c7 $c8 $c9 $d1 $d2 $d3 $d4 $d5 $d6 $d7 $d8 $d9 $d9 $e2 $g2 $h2 >>> $h2 >>> $i2 $k2 $k2 $l2 $n2 $n2 $o2 $o2 $r2 $s2 $t2 $u2 $u2 $v2 $x2 $y2 $z2 $z2 >>> $b7 >>> $f3 $e3 $e3 $g3 $j3 $h3 $i3 $k3 $k3 $m3 $n3 $p3 $p3 $q3 $o3 $s3 $t3 $t3 >>> $u3 >>> $v3 $x3 $y3 $z3 $b8 $f4 $e4 $e4 $g4 $h4 $i4 $k4 $l4 $m4 $m4 $n4 $r4 $q4 >>> $o4 >>> $o4 $s4 $w4 $u4 $u4 $v4 $y4 $y4 $z4 $z4 $f5 $j5 $j5 $g5 $i5 $k5 $l5 $l5 >>> $m5 >>> $m5 $n5 $q5 $o5 $s5 $s5 $t5 $u5 $u5 $x5 $y5 $z5 $f6 $f6 $h6 $h6 $g6 $g6 >>> $k6 >>> $p6 $m6 $r6 $r6 $n6 $o6 $s6 $s6 $w6 $u6 $x6 $x6 $e7 $f7 $j7 $h7 $h7 $i7 >>> $l7 >>> $l7 $k7 $m7 $m7 $q7 $n7 $n7 $o7 $t7 $w7 $w7 $u7 $v7 $x7 $z7 $z7 $e8 $e8 >>> $h8 >>> $g8 $i8 $i8 $l8 $k8 $k8 $m8 $q8 $n8 $n8 $s8 $t8 $w8 $y8 $y8 $u8 $x8 $z8 >>> $f9 >>> $f9 $e9 $h9 $h9 $g9 $p9 $p9 $k9 $r9 $r9 $m9 $n9 $n9 $o9 $t9 $t9 $w9 $v9 >>> $u9 >>> $u9 $z9 $x9 >>> >>> Pharo 50041 gives... >>> $a1 $a2 $a3 $a4 $a5 $a6 $a7 $a8 $a9 $b1 $b2 $b3 $b4 $b5 $b6 $b7 $b8 $b9 >>> $c1 >>> $c2 $c3 $c4 $c5 $c6 $c7 $c8 $c9 $d1 $d2 $d3 $d4 $d5 $d6 $d7 $d8 $d9 $e1 >>> $e2 >>> $e3 $e4 $e5 $e6 $e7 $e8 $e9 $f1 $f2 $f3 $f4 $f5 $f6 $f7 $f8 $f9 $g1 $g2 >>> $g3 >>> $g4 $g5 $g6 $g7 $g8 $g9 $h1 $h2 $h3 $h4 $h5 $h6 $h7 $h8 $h9 $i1 $i2 $i3 >>> $i4 >>> $i5 $i6 $i7 $i8 $i9 $j1 $j2 $j3 $j4 $j5 $j6 $j7 $j8 $j9 $k1 $k2 $k3 $k4 >>> $k5 >>> $k6 $k7 $k8 $k9 $l1 $l2 $l3 $l4 $l5 $l6 $l7 $l8 $l9 $m1 $m2 $m3 $m4 $m5 >>> $m6 >>> $m7 $m8 $m9 $n1 $n2 $n3 $n4 $n5 $n6 $n7 $n8 $n9 $o1 $o2 $o3 $o4 $o5 $o6 >>> $o7 >>> $o8 $o9 $p1 $p2 $p3 $p4 $p5 $p6 $p7 $p8 $p9 $q1 $q2 $q3 $q4 $q5 $q6 $q7 >>> $q8 >>> $q9 $r1 $r2 $r3 $r4 $r5 $r6 $r7 $r8 $r9 $s1 $s2 $s3 $s4 $s5 $s6 $s7 $s8 >>> $s9 >>> $t1 $t2 $t3 $t4 $t5 $t6 $t7 $t8 $t9 $u1 $u2 $u3 $u4 $u5 $u6 $u7 $u8 $u9 >>> $v1 >>> $v2 $v3 $v4 $v5 $v6 $v7 $v8 $v9 $w1 $w2 $w3 $w4 $w5 $w6 $w7 $w8 $w9 $x1 >>> $x2 >>> $x3 $x4 $x5 $x6 $x7 $x8 $x9 $y1 $y2 $y3 $y4 $y5 $y6 $y7 $y8 $y9 $z1 $z2 >>> $z3 >>> $z4 $z5 $z6 $z7 $z8 $z9 >>> >>> (start your comparison at $b5) >>> >>> So in one axis Pharo has improved Transcript, but we didn't notice the >>> significance of the use case we lost. >>> >>> cheers -ben >>> >> >> Please take a good look at Cuis' Transcript and consider using it. >> >> By default, the display is updated immediately, but without calling >> Morphic, it can even work with no UI framework at all. It does updates >> faster than Squeak or Visualworks: >> >> Time millisecondsToRun: [ 1000 timesRepeat: [ Transcript show: >> 'x' ] ]. 763. >> >> But if you want minimum overhead without immediate feedback: >> >> Time millisecondsToRun: [ Transcript showOnDisplay: false. 1000 >> timesRepeat: [ Transcript show: 'x' ]. Transcript showOnDisplay: true ]. 1. >> "As fast as Pharo" >> >> It is also thread safe, and for Ben's example: >> >> Transcript clear. >> [ >> $a asciiValue to: $z asciiValue do: [ :c | >> [ 1 to: 9 do: [ :i | Transcript show: c asCharacter >> printString , i printString , ' ' ] ] forkAt: 40 >> ]. >> ] forkAt: 41 >> >> it gives the same result as Pharo. >> >> The fact that the updates are not bound to Morphic also means that it is >> possible to do #show: deep in Morphic logic, without causing infinite loops >> or recursions, and get immediate feedback. It has proved to be a useful aid >> in debugging Morphic code. >> >> Cheers, >> Juan Vuletich >> >> >> > > > -- > best, > Eliot

May 9, 2015