December 2014 - Pharo-dev - lists.pharo.org

Re: [Pharo-dev] [Vm-dev] [ANN] ARM Stack VMs available
by Eliot Miranda Dec. 7, 2014

Dec. 7, 2014

Hi Juan, On Dec 5, 2014, at 4:56 AM, "J. Vuletich (mail lists)" <juanlists(a)jvuletich.org> wrote: > Hi Folks, > > The Squeak process scheduler usually preempts a process only by another one of higher priority. And when the scheduler is ready to go back at the lower priority, it will always resume the same process that was last suspended. The only way for two or more processes of the same priority to share the processor is when the running process calls #wait or #yield. No. According to the blue book preempting sends the preempted process to the back if its run queue so preempting forces a yield. Obviously this is wrong, but that's the way it was defined. The ObjectWorks & VisualWorks VMs changed this to work as you describe. When I implemented Cog I wanted to fix this but not break old code so I made it optional. The behavior is controlled by a flag in the image. You can see the flags via Smalltalk vmParameterAt: 48. Bit 2 (value 4) is set if preempting puts the preempted process at the head of its list, and hence does not yield. Here's the part of the comment from vmParameterAt: 48 various properties of the Cog VM as an integer encoding an array of bit flags. Bit 0: implies the image's Process class has threadId as its 3rd inst var (zero relative) Bit 1: on Cog VMs asks the VM to set the flag bit in interpreted methods Bit 2: if set, preempting a process puts it to the head of its run queue, not the back, i.e. preempting a process by a higher one will not cause the process to yield to others at the same priority. > This means that using shared state from several processes at the same priority (without using any locking mechanism, such as Semaphores, Monitors or critical sections) is safe, as long as the processes do #wait or #yield only when that shared state is in a consistent state. Right. > > It looks like this ARM VM is somehow not following this convention. If this was the case, the problems Ken sees are to be expected. Can you check the bit is set in the image? Thanks for raising this. It looks like the Spur images have the bit cleared. Ouch. Ah, it's not a problem of the bootstrap, its at least a problem in trunk. The bit is not set in trunk. I need to a) write some tests to test the bit and b) make sure its set in the relevant places. > > HTH, > Juan Vuletich Eliot (phone) > Quoting Douglas McPherson <djm1329(a)san.rr.com>: > >> Hi Ken, >> >>> On Nov 11, 2014, at 16:28, Ken Dickey <Ken.Dickey(a)whidbey.com> wrote: >>> >>> >>> On Sun, 9 Nov 2014 20:56:47 -0800 >>> Douglas McPherson <djm1329(a)san.rr.com> wrote: >>> >>> KenD>> >>>>> The stkspurlinuxhtARM VM, however, complains: >>>>> This interpreter (vers. 6521) cannot read image file (vers. 6505). >>>>> >>>>> I presume some conversion is required to get the image into SPUR format? >>>> Yes, the Spur VMs require a new image format. There are recent Squeak trunk images in the spur format on Eliotâs site. Iâll let Eliot and others comment about how a Cuis image might be converted. >>> >>> I tried out the Squeak SPUR image from the Cog site and everything Squeak seems fine. >>> >>> >>> There is a timing bug with Cuis redraw that shows up on both the stklinuxhtARM vm and the one you sent me earlier. >>> >>> Basically, I am using DisplayObject>>slideFrom:to:nSteps:delay: to do some animation. When multiple timer events fire during an animation it sometimes appears that the x,y redraw origin is used from the currently drawing morph's position, not 0,0. I.e. part of the redisplay is offset. [Display redraw via menu corrects the display]. >>> >>> This _only_ happens on the Samsung ARM Chromebook, never on Intel CPUs. >> >> Thanks for reporting this. Iâll try to look into it. There are definitely ARM-specific changes to support certain atomic operations, so there may be something not quite right with these. >> >> Can you suggest a method for reproducing this in Squeak? I repeatedly sent morphs to the trash (with appropriate preference set to enable the animation) but didnât see an issue. I suspect Iâm not driving it hard enough. >> >>> My life is really, really busy right now, so I have never had time to dig into this. I can redraw the display, so a workaround exists. >>> >>> [One possible resource. The Apache Portable Runtime, http://apr.apache.org/ , implements compareAndSwap and various other atomic operations across various OSs.] >> >> Thanks for the reference. It may be useful. I also found a library called Mintomic (http://preshing.com/20130505/introducing-mintomic-a-small-portable-lock-fre…) which may help. >> >>> I am happy to do quick tests, but must apologize for lack of time to dig into this. >> >> No problems, and thanks again for reporting it. >> >> >>> FYI, >>> -KenD

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New Cog VMs available
by Eliot Miranda Dec. 7, 2014

Dec. 7, 2014

... at http://www.mirandabanda.org/files/Cog/VM/VM.r3163/. CogVM binaries as per VMMaker.oscog-eem.972/r3163 Fix a devilishly tricky bug with 32-bit Spur and PICs in the Cogit. In 32-bit Spur only zero is a valid cache tag, that for Characters, due to SmallIntegers having both 2r11 and 2r01 as valid tags. The cache check prolog collapses these down onto 1 by anding with 1 and hence collapses Character's 2r10 to 0. The cache tag is also tested in the PIC abort routine to distinguish between an MNU abort and an interpret abort. A PIC MNU entry jumps to code that first zeros the cache tag (held in ClassReg) before calling the abort routine, which tests ClassReg and selects the relevant abort processing. Hence in 32-bit Spur if a send site is linked for Character and later extended to a PIC with an interpret case, that interpret case will instead invoke MNU processing. This is rare; first there needs to be a send to a CHaracter, then a send to something else which binds to something that must be interpreted. Ouch. The fix is simple; if a send site that was linked with a zero cache tag (which can only happen in 32-bit Spur) link to an open PIC instead of to a closed PIC, or in the case of an MNU do not link. Add a debug lookup routine that only looks up (and follows forwarding pointers). Add a -breakmnu vm argument that calls warning on an mnu of a specific selector. Fix SmartSyntaxPlugin code generation for Spur of - asOop: old code assumed 4 byte oops & headers - Unsigned old code assumed 32-bit oops Affects AsyncFilePlugin, BochsIA32Plugin & FT2Plgin. Avoid duplication of effort in special selector send forwarding fault handling. Improve stack trace printing for Newspeak and Glue by providing something that assumes the penultimate literal is the selector or an AdditionalMethodState-like thing containing it. Reimplement primitiveCopyObject to work for both pointer and bits objects. This to support a good Object>>clone for Spur. Fix Spur's isWordsOrBytes[NonImm]:. Old code answered true for CompiledMethods. -- best, Eliot

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[pharo-project/pharo-core] e1a077: 40402
by GitHub Dec. 7, 2014

Dec. 7, 2014

Branch: refs/heads/4.0 Home: https://github.com/pharo-project/pharo-core Commit: e1a077fc751bef685657e9fc7e81175c3bf30f1b https://github.com/pharo-project/pharo-core/commit/e1a077fc751bef685657e9fc… Author: Jenkins Build Server <board(a)pharo-project.org> Date: 2014-12-06 (Sat, 06 Dec 2014) Changed paths: A ConfigurationOfShoreLineReporter.package/ConfigurationOfShoreLineReporter.class/README.md A ConfigurationOfShoreLineReporter.package/ConfigurationOfShoreLineReporter.class/class/accessing/project.st A ConfigurationOfShoreLineReporter.package/ConfigurationOfShoreLineReporter.class/class/development support/DevelopmentSupport.st A ConfigurationOfShoreLineReporter.package/ConfigurationOfShoreLineReporter.class/class/development support/validate.st A ConfigurationOfShoreLineReporter.package/ConfigurationOfShoreLineReporter.class/class/loading/load.st A ConfigurationOfShoreLineReporter.package/ConfigurationOfShoreLineReporter.class/class/loading/loadBleedingEdge.st A 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ShoreLine-Report-UI.package/SlReportWindow.class/instance/actions/updateSettings.st A ShoreLine-Report-UI.package/SlReportWindow.class/instance/initialization/generateReport.st A ShoreLine-Report-UI.package/SlReportWindow.class/instance/initialization/initializeAutoSubmit.st A ShoreLine-Report-UI.package/SlReportWindow.class/instance/initialization/initializeGranularity.st A ShoreLine-Report-UI.package/SlReportWindow.class/instance/initialization/initializePresenter.st A ShoreLine-Report-UI.package/SlReportWindow.class/instance/initialization/initializeWidgets.st A ShoreLine-Report-UI.package/SlReportWindow.class/instance/protocol/title.st Log Message: ----------- 40402 14566 ShoreLine Reporter Integration https://pharo.fogbugz.com/f/cases/14566 http://files.pharo.org/image/40/40402.zip

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Slow TreeListMorph
by Nicolai Hess Dec. 7, 2014

Dec. 7, 2014

Anyone knows for what this is used: TreeListMorph>> addSubmorphsAfter: parentMorph fromCollection: aCollection allowSorting: sortBoolean "Update the font on each morph." |answer| answer := super addSubmorphsAfter: parentMorph fromCollection: aCollection allowSorting: sortBoolean. "---- THIS TAKES TIME ----" self scroller submorphsDo: [:i | i font: self font; extent: i minWidth @ i minHeight]. "---- XXXXX ----" ^answer setting the font and extent on all scroller submorphs is extremly slow. Try to merge a package with many changes, it takes up to several minutes until the DiffMorph shows up. Removing the above lines makes the DiffMorph much faster and I can not see any visual difference. nicolai

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Problem copy pasting from internet browser to GTPlayground
by kilon alios Dec. 6, 2014

Dec. 6, 2014

I try to copy this code here https://www.facebook.com/ObjectProfile/posts/742756179144315 and paste it to Playground to do it. It inserts illegal characters. I am on MacOS Yosemite and tried Chrome and Safari. Workspace also has same issue. Is there a solution to this ? Copy pasting code from an internet browser is kinda a huge deal.

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contributing to Pharo testing effort
by sheridan＠sheridan-mahoney.com Dec. 6, 2014

Dec. 6, 2014

Hi there, I am interested in helping out with writing tests in Pharo, and was wondering where would be a good place to start. I am familiar with Smalltalk from working at GemStone Systems in their QA department some years ago, but am somewhat new to Pharo. Any advice would be very appreciated. Best regards, Sheridan Mahoney

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Athens-SVG
by stepharo Dec. 6, 2014

Dec. 6, 2014

Hi I started to define a configuration for Athens-SVG to load XML dependencies. And I started to clean the organization and add some comments. Now I will be able to use it in Bloc :) Stef

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default fonts changed in Pharo 4.0
by Esteban Lorenzano Dec. 6, 2014

Dec. 6, 2014

Hi, We changed the default fonts in Pharo for the ones that are used normally in Moose. They are: Source Sans Pro and Source Code Pro. We needed to do it for several reasons: 1) TxText (the new text model) is cairo based, and cairo just can work with real fonts, so we need them as default (now we will be able to integrate TxText and start the replace of old editors) 2) Current fonts takes too much space and do not scales fine (at least that Iâve been told) So, well, thatâ¦ you will see âsomething differentâ when you download latest image version :) cheers, Esteban

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12854 TestRunner>>categorySelected hard coded zero
by Ben Coman Dec. 6, 2014

Dec. 6, 2014

Anyone know why TestRunner>>categorySelected was hard coded to return zero? It breaks shift-click multiple selection in TestRunner. Seems we've lived with it a long time... * Version info --> "lr 10/31/2005 15:11" btw, SystemReporter>>categorySelected method is identical * Hardcoded to return zero * Version info --> "lr 10/31/2005 15:11" maybe one class was copied to the other? cheers -ben Fix submitted... https://pharo.fogbugz.com/default.asp?12854

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GetOpt
by phil＠highoctane.be Dec. 6, 2014

Dec. 6, 2014

I have made Ian Piumarta's GST GetOpt work in Pharo 3.0 See: http://www.smalltalkhub.com/#!/~philippeback/GetOpt Nice tool even if we have some other support in CommandLineHandlers. But for a quick parameters setting in your own CommandLineHandler, it is fast to use and easy to debug. Phil

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