Vm-dev June 2009

vm-dev@lists.squeakfoundation.org

15 participants
17 discussions

Profiling and delay accuracy
by Andreas Raab 06 Aug '11

06 Aug '11

Hi Folks - For a long time now I had this feeling that MessageTally reports pretty bogus results in many situations without being able to precisely track down why this would be the case. Today I was looking at primitiveResponse() and, much to my surprise, noticed that the checkForInterrupts() that used to be there for years is gone (see Squeak3.6 for example which still has it). The sole reason for this check was to get both high delay accuracy and good profiling behavior. Consider this example: fc := FormCanvas on: Display. MessageTally spyOn:[ 1 to: 100 do:[:i| fc fillColor: Color white. fc printString. ]. ]. Using 3.6 this will be measured correctly as: **Tree** 87.5% {243ms} FormCanvas>>fillColor: |87.5% {243ms} GrafPort>>fillRect:offset: | 87.5% {243ms} GrafPort>>copyBits 12.5% {35ms} FormCanvas(Object)>>printString 12.5% {35ms} FormCanvas(Object)>>printStringLimitedTo: whereas the 3.10 reports it as **Tree** 99.6% {670ms} FormCanvas(Object)>>printString 94.9% {639ms} primitives 4.6% {31ms} FormCanvas(Object)>>printStringLimitedTo: I think you can see the problem and just imagine what this does to any cumulative results. I also wonder what that change does to platforms that don't have high-resolution asynchronous timers. This used to be the one place where we would catch timer changes at high resolution and unless the platform forces high resolution timer interrupts asynchronously (by resetting the interrupt counter) we must be loosing a lot in terms of delay accuracy. (it just so happens that the Windows VM *does* do asynchronous timer interrupts so I never noticed this but I'm very curious about the difference on Linux which typically still has pretty bad timer granularity). Any opinions? My feeling is that the timer check should go back in for all of the above reasons. At the very least a quickCheckForInterrupt() is required but I actually think putting the full check back in is worth it. Cheers, - Andreas

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Joys of Squeak-dev image, VM Compiling on MacIntel and Spoon remote OtherBrowsing
by Ken G. Brown 16 Nov '10

16 Nov '10

MacPro OS X 10.4.9 Xcode 2.4.1 Squeak-dev-114-2, VMMaker 2.8b6.1, Squeak 3.8.15beta6U.app, and version 1657 of svn MacOS VM sources, and Spoon v2a12. Downloaded http://www.squeakvm.org/cgi-bin/viewcvs.cgi/ trunk version 1657 for MacOS Ran squeak-dev-beta-114-2.image on Squeak 3.8.15beta6U.app Loaded VMMaker 3.8b6.1 from dev image Universes. Generated vm sources by following instructions in <http://www.squeakvm.org/cgi-bin/viewcvs.cgi/trunk/platforms/Mac%20OS/vm/Doc…> Fought with Xcode wanting to use MacOSX10.3.9.sdk for ppc which was giving an error which was known and documented in the Readme. Finally figured out what Xcode wanted so built universal app just using 10.4.9 sdk. Couple issues: Exupery references remain in sqnamedPrims.h and sqPlatformSpecific.h from svn version 1657, I just commented them out. Notes said: Info-NPSqueak__Upgraded_.plist was to be found in the Developer directory. I could not find it so scammed a info.plist out of John's Squeak 3.8.15beta6U.app vm. Not sure what impact this has. And much, much diddling about figuring out various things... Finally got a build. It's a lot smaller (3.9MB) than John McIntosh's Squeak 3.8.15beta6U.app (8.1MB), and it looks like it is a PowerPC one but at least it runs. I'll look into the Xcode build process some more. Then: Replaced interp.c with Craig's interp.c for Spoon, rebuilt and got a VM with Spoon client stuff. Downloaded Spoon release 2a12. Moved a copy of Flow plugin from within Craig's naiad.app package into a plugins subdirectory where the new spoon client compatible MacIntel universal VM was run from. Followed Craig's Spoon instructions for loading niaid.st and niaid.pr into the 3.10 image (Squeak-dev-114-2) running on the new VM. Did the run spoon.app thing from Spoon.dmg (version 2a12), needs to be done twice if Safari is not running. Got Spoon processor running. Followed instructions again in the Spoon client and lo! Got OtherBrowser browsing the Spoon memory running on processor. Yay Craig! Who do i get to sign my certificate? :) Ken

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Fwd: [Pharo-project] Could not load VMMaker in 10315
by John M McIntosh 18 Aug '09

18 Aug '09

Begin forwarded message: > From: Stéphane Ducasse <stephane.ducasse(a)inria.fr> > Date: May 24, 2009 1:35:01 AM PDT (CA) > To: Pharo Development <Pharo-project(a)lists.gforge.inria.fr> > Subject: [Pharo-project] Could not load VMMaker in 10315 > Reply-To: Pharo-project(a)lists.gforge.inria.fr > > Hi > > I did > > ScriptLoader loadFFI > Then loaded VMMaker-dtl.122 > Then proceeded when asked about klatt. > > And I got Cannot compile -- stack including temps is too deep > > what did I miss? > > Stef > > _______________________________________________ > Pharo-project mailing list > Pharo-project(a)lists.gforge.inria.fr > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project -- = = = ======================================================================== John M. McIntosh <johnmci(a)smalltalkconsulting.com> Twitter: squeaker68882 Corporate Smalltalk Consulting Ltd. http://www.smalltalkconsulting.com = = = ========================================================================

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Forwarded: [squeak-dev] Re: Problems building squeak VM (Fedora core 11)
by David T. Lewis 16 Aug '09

16 Aug '09

FYI for folks building VMs on Linux, the following is from the squeak-dev list. See the list archives for background. Dave ----- Forwarded message from Casimiro de Almeida Barreto <casimiro.barreto(a)gmail.com> ----- Date: Thu, 25 Jun 2009 00:16:06 -0300 From: Casimiro de Almeida Barreto <casimiro.barreto(a)gmail.com> To: The general-purpose Squeak developers list <squeak-dev(a)lists.squeakfoundation.org> Subject: [squeak-dev] Re: Problems building squeak VM (Fedora core 11) Precedence: list Problem is Fedora rel 11 compiler is botched. Made a copy of /usr/include/stdio.h in $ROOT/platforms/unix/vm/stdio.h Edited this file removing dprintf (starting line 399) Changed: #include <stdio.h> to: #include "stdio.h" whenever had problem. in file debug.c included line #include <stdlib.h> Dirty work. But fix things... :( ----- End forwarded message -----

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Resources directory in SecurityPlugin
by Bert Freudenberg 04 Aug '09

04 Aug '09

When running Etoys inside a web browser, the file sandbox is preventing access to all files outside the "Etoys" working directory (a.k.a. "untrusted user directory"). That means we cannot open help guides or switch languages or access examples or the sources file etc. Proposed solution: In the SecurityPlugin, allow read-only file to a "resource" directory (in addition to read-write access to the "untrusted user directory"). The default for this resource directory would be the image directory. I did it for Unix, you can find a diff attached to the Etoys ticket: http://tracker.squeakland.org/browse/SQ-241 Basically, the writeFlag is now passed down to isAccessiblePathName(), and in case it's read-only, it allows access to the resource dir (which is configurable but defaulting to the image path). Any chance to get the same behavior implemented on Mac and Win VMs, too? Thanks :) - Bert -

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behavior issues with windows vm?
by John M McIntosh 29 Jun '09

29 Jun '09

Given a Pharo0.1Core-10204.image with the following changes to collect startup times in SystemDictionary>>send: toClassesNamedIn: with: Seem simple? I hacked usage of FilePackage log: because it was simple and wanted to record times & progress to a file in the VM directory. But the windows VM coughs up the dialog saying the file does not exist, create a new file or choose another file. This does not happen on mac or linux? The file is not created via the hopeful code in the modified FilePackage>>logFileStream It does not write a debug log, does not allow mouse clicks, keyboard entry etc, in general it's obvious to any input activity at this point. Now I wondering here if sandboxing for etoys is leaping in and being nasty? Is there some magical call that is done later in the startup: processing that ok's the ability to create files? And that I *know* later after system startup I *can* invoke FilePackage log: 'foo' and we are happy if I rip out the file access in log: Oh and I'm here because WikiServer wouldn't start on Windows, well because I've ripped out lots of eToy stuff, like the the eToy startup security sandboxing which isn't needed on the iPhone. changes to base 10204 image SystemDictionary>>send: startUpOrShutDown toClassesNamedIn: startUpOrShutDownList with: argument "Send the message #startUp: or #shutDown: to each class named in the list. The argument indicates if the system is about to quit (for #shutDown:) or if the image is resuming (for #startUp:). If any name cannot be found, then remove it from the list." | removals class t6 t7 | removals := OrderedCollection new. startUpOrShutDownList do: [:name | class := self at: name ifAbsent: [nil]. class == nil ifTrue: [removals add: name] ifFalse: [class isInMemory ifTrue: [t6 := Time millisecondClockValue. class perform: startUpOrShutDown with: argument. startUpOrShutDown = #startUp: ifTrue: [t7 := class printString , ' ' , (Time millisecondClockValue - t6) printString. FilePackage log: t7]]]]. "Remove any obsolete entries, but after the iteration" startUpOrShutDownList removeAll: removals FilePackage>>logFileStream LogFileStream ifNil: [LogFileStream := StandardFileStream forceNewFileNamed: 'ConflictChecker.log'. LogFileStream setToEnd]. LogFileStream closed ifTrue: [LogFileStream reopen. LogFileStream setToEnd]. ^ LogFileStream Oh at shutdown: time we need to do a FilePackage closeLog, where that happens is an exercise for the reader. -- = = = ======================================================================== John M. McIntosh <johnmci(a)smalltalkconsulting.com> Twitter: squeaker68882 Corporate Smalltalk Consulting Ltd. http://www.smalltalkconsulting.com = = = ========================================================================

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Re: [vm-dev] Adding curlplugin source into the source tree
by Marco Schmidt 29 Jun '09

29 Jun '09

Super! This could be the last part of my google-api puzzle... Could we set HTTP-Header in the new version? Thx Marco danil.osipchuk wrote: > > > Hello > > In my spare time I'm trying to bring CurlPlugin up to date and to make > it easier to install. There are also several pending feature requests > from users. > > CurlPlugin has several dependencies (libssl, ssh etc) and to make a > working infrastructure for it is not very fun (especially when time > has passed since last build). > > Could vm-builders please consider to add platform specific files into > the trunk to ease the maintainence of this thing? > At a moment I have a working setup for windows > (.\platforms\win32\plugins\CurlPlugin ) which I can email right now > and I also plan to add linux setup. I've noticed that John has already > added necessary files into the tree for mac os. > > regards, Danil > > -- View this message in context: http://www.nabble.com/Adding-curlplugin-source-into-the-source-tree-tp24205… Sent from the Squeak vm-dev mailing list archive at Nabble.com.

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Adding curlplugin source into the source tree
by danil osipchuk 25 Jun '09

25 Jun '09

Hello In my spare time I'm trying to bring CurlPlugin up to date and to make it easier to install. There are also several pending feature requests from users. CurlPlugin has several dependencies (libssl, ssh etc) and to make a working infrastructure for it is not very fun (especially when time has passed since last build). Could vm-builders please consider to add platform specific files into the trunk to ease the maintainence of this thing? At a moment I have a working setup for windows (.\platforms\win32\plugins\CurlPlugin ) which I can email right now and I also plan to add linux setup. I've noticed that John has already added necessary files into the tree for mac os. regards, Danil

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Thoughts about Cog and "tracing" etc
by Göran Krampe 24 Jun '09

24 Jun '09

Hi folks! This post is a just a "heads up" based on some websurfing around VMs and JITs. I am itching badly to hear Eliot announce some kind of Cog-thingy - so consider this rambling post to be a symptom of that itch. :) There are a few things going on in the VM world that most of us have no clues about. We know about V8 but most may not know about TraceMonkey/Tamarin and its use of a new technique called "tracing" and a backing library for it - nanojit. Evidently TraceMonkey is giving V8 a real run for its money, and AFAICT this is mainly due to work of Andreas Gal (really interesting long article): http://andreasgal.com/2008/08/22/tracing-the-web And some other: http://www.bailopan.net/blog/?p=72 Hot off the press (yesterday): http://www.bailopan.net/blog/?p=430 After having read that Eliot does not think LLVM is suitable mainly due to lack of large basic blocks in Smalltalk code - and he seems to be looking hard at Factor and its JIT - I just wanted to mention the above as Yet Another Interesting Bit. I also think that the latest work on Lua (LuaJIT) includes tracing, not sure though. So Eliot, how is your work progressing? No pressure, just LOTS of interest! :) regards, Göran PS. Being bored hacking C#...

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Ctrl-M?
by Michael Rueger 23 Jun '09

23 Jun '09

Hi all, while debugging through some event handling on Windows it seems that ctrl-m is the only key (combination) that is not generating a keystroke event? See the low level key event log below. Explanations? Red herring pointers? Thanks Michael P.S. Haven't checked on other platforms [keyDown '<tab>'] [keystroke '<tab>'] #(2 32815515 9 2 0 9 0 1) [keyUp '<tab>'] #(2 32819187 17 1 2 17 0 1) [keyDown '<Ctrl-q>'] pressing the ctrl key #(2 32819890 77 1 2 77 0 1) [keyDown '<Ctrl-M>'] #(2 32819968 77 2 2 77 0 1) [keyUp '<Ctrl-M>'] #(2 32820515 17 2 0 17 0 1)

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Vm-dev June 2009