Vm-dev June 2010

vm-dev@lists.squeakfoundation.org

42 participants
52 discussions

Re: [squeak-dev] A couple of memory management related questions
by Yoshiki Ohshima 16 Jun '10

16 Jun '10

At Tue, 15 Jun 2010 16:44:57 -0500, Ralph Johnson wrote: > > If people define classes by hand, I imagine 64k would be enough. But > suppose they are using light-weight classes, i.e. giving each object > its own behavior. Then it would be fairly easy to have more than 64K > of them, though 1M is still a reasonable limit. > > What is the difference in cost between choosing 64K as the limit and > choosing 1M? I know, one byte, but what else would you use that byte > for? If the next highest notch from 16 bit is 24 bit but not 20 bit, that would be 16M but not 1M. The big images in "our" use cases is with several million objects (not that big in other standard), so if each object theoretically had a distinct class, it would only barely fits. But in reality 16M classes and an object occupies around 40 byte each on avarage, only 6 instances or such per class on average before hitting 4GB. So, for 32-bit address space in mind, 16M classes would be a lot. 1M classes would be 100 instances on average (where the distribution of instance count is highly skewed so average would not make so much sense however), it still would be okay. (As Ralph asked, what are the other things that are competing the bits?) -- Yoshiki

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Re: [Vm-dev] I think I've found a bug in the 64-bit Squeak VM memory compactor
by ungar＠mac.com 15 Jun '10

15 Jun '10

Jecel, Great story! Creative fix. Just to clarify, I am talking about the part of the image AFTER the header; where the oops start. Thanks for the smile, - David On Jun 14, 2010, at 6:05 PM, Jecel Assumpcao Jr. wrote: > > Dave, > >> The workaround for my VM is simply to skip those first free words, so that the >> first word in the heap is a non-free object. (The snapshot code does a GC so all >> real free objects are gone by this time). > > Doesn't the image start with some header bytes (512 in the case of Unix) > which end up loaded into the start of the heap? Or do these get stripped > away at some point? > > This reminds me of an OS I created for the iAPX286. I don't know if that > particular processor was bad or if it was a design flaw, but jumping or > calling to byte 0 of a segment didn't work in protected mode. So I moved > the class pointer to the first two bytes of every segment (we had one > object per segment and the class pointer had previously been a part of > the object table) and the bug didn't bother us anymore. > > -- Jecel >

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VM Maker: VMMaker-jcg.182.mcz
by squeak-dev-noreply＠lists.squeakfoundation.org 15 Jun '10

15 Jun '10

Joshua Gargus uploaded a new version of VMMaker to project VM Maker: http://www.squeaksource.com/VMMaker/VMMaker-jcg.182.mcz ==================== Summary ==================== Name: VMMaker-jcg.182 Author: jcg Time: 14 June 2010, 3:17:32 am UUID: a90f8eaa-cb37-4f2d-8b25-93240caf0823 Ancestors: VMMaker-dtl.181 Fix stack-imbalance in FFIPlugin>>primitiveDestroyManualSurface. =============== Diff against VMMaker-dtl.181 =============== Item was changed: ----- Method: FFIPlugin>>primitiveDestroyManualSurface (in category 'primitives - surfaces') ----- primitiveDestroyManualSurface "arguments: name(type, stack offset) surfaceID(Integer, 0)" | surfaceID result | self export: true. interpreterProxy methodArgumentCount == 1 ifFalse: [^interpreterProxy primitiveFail]. surfaceID := interpreterProxy stackIntegerValue: 0. interpreterProxy failed ifTrue: [^nil]. result := self destroyManualSurface: surfaceID. result = 0 ifTrue: [^interpreterProxy primitiveFail]. + ^interpreterProxy pop: 1 - ^interpreterProxy pop: 2 !

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Immutability, newspeak (was: Vm-dev post from jbaptiste.arnaud@gmail.com requires approval)
by David T. Lewis 13 Jun '10

13 Jun '10

The following message to vm-dev was blocked due to size of the attachments (3 MB) so I am forwarding the message text directly to the list without attachments. Jean Baptiste, If you can make the ImageSide.zip and VMMaker-jb.172.mcz files available from a web site, that would be helpful. Thanks, Dave ----- Forwarded message from vm-dev-owner(a)lists.squeakfoundation.org ----- From: Jean Baptiste Arnaud <jbaptiste.arnaud(a)gmail.com> Subject: Immutability, newspeak Date: Mon, 7 Jun 2010 13:31:44 +0200 To: Squeak Virtual Machine Development Discussion <vm-dev(a)lists.squeakfoundation.org> X-Mailer: Apple Mail (2.1078) Hi, I extract the code of The immutability bit from Newspeak. I have do a first step : - I have the same test from Newspeak image : - Pass the test as Newspeak image. Use the same bit and the same primitive numbers from Newspeak. Do it from a Pharo image: Pharo-1.0 Latest update: #10517 on a VMMaker 170 version (the code have Pharo patch and Alien-VMMaker-Support). I send the code if that interest some people. You can give me feedback, recommendation. The VMMaker Change All other change of the image. Regard Jean Baptiste Arnaud jbaptiste.arnaud(a)gmail.com

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Temp directory for Squeak
by K. K. Subramaniam 13 Jun '10

13 Jun '10

Hi, I propose that we add one more user directory to squeak - a volatile writable directory that can used for temporary files. On most hosts, temporaryDirectory will be mapped to RAM and not hard disk or flash memory. RAM has reduced I/O latency, power drain and wear/tear. mktemp family of calls can be used to create it (on first access) portably in both plugin code and in launch scripts. One use case was its use to convert LaTeX code into images on the fly (cf LatexMorph) for typesetting Indic/Math text. We could use it for Squeakets, for caching large remote files, for dealing with A/V clips etc. Subbu

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Re: [Pharo-project] could not find module vm-display-X11
by Mariano Martinez Peck 13 Jun '10

13 Jun '10

I cc'ed vm mailing list that maybe they can help you. Cheers mariano On Thu, Jun 10, 2010 at 9:56 AM, spiralofhope <spiralofhope(a)lavabit.com>wrote: > Reading here: > http://www.pharo-project.org/pharo-download > It says this file "contains all necessary files", so I downloaded it: > http://gforge.inria.fr/frs/download.php/26828/Pharo-1.0-OneClick.zip > It says "run the executable". I don't know what executable it's > referring to, so I'm trying Pharo.sh > > When I do, I get: > could not find module vm-display-X11 > > I've done general searches as well as searches through the Pharo forum > and mailing lists. I haven't seen anyone else with this problem, so I'm > still not sure what to do and I need help. > > I'm running Linux i686.. it's only a release candidate distro (Unity > Linux), so I wouldn't be surprised to learn that there are > distro/library issues. > > I can give additional system information if you need. The website > doesn't mention any dependencies, but could I be missing some? > > --- > > Reading here: > http://www.pharo-project.org/pharo-download > I see a section for "Custom downloads". > > The instructions say: > To run Pharo you need an image, changes, and a sources file, as well as > a VM for your platform. When downloads are completed, uncompress all > files and put them into the same directory (this directory should then > contain a .image, .changes, and a .sources file). Then start the VM. > > I downloaded these files: > Image and Changes: > http://gforge.inria.fr/frs/download.php/26790/Pharo-1.0.zip > Sources: > https://gforge.inria.fr/frs/download.php/24391/PharoV10.sources.zip > Virtual Machine: > http://gforge.inria.fr/frs/download.php/24736/pharo-vm-0.15.2f-linux.zip > > I unzipped them all into the same directory. > > Pharo-1.0.zip already had a PharoV10.sources within it, so I used the > one from PharoV10.sources.zip > > I see these files in the same directory: > Pharo-1.0.image > Pharo-1.0.changes > PharoV10.sources > > I don't know what to do now, there are no instructions for running > Pharo after those steps. > > --- > > I've done a lot of playing outside of the above steps, but I'm > completely ignorant of how Pharo is installed (or compiled?) and run. > So far it's nothing like the other software I've used. > > Any advice is appreciated. I'm also willing to try a LiveCD of any > Linux/BSD distro if that'll help me get Pharo working more easily. My > goal here is just to check Pharo out, so I could deal with using another > distro temporarily. > > > -- > http://spiralofhope.com > > > _______________________________________________ > Pharo-project mailing list > Pharo-project(a)lists.gforge.inria.fr > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project >

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Old SqueakFFIPrims in Squeak 4.1 VM (Squeak 4.2.4beta1U.app)
by Josh Gargus 11 Jun '10

11 Jun '10

Hi, I just discovered that the standard Squeak 4.1 VM doesn't contain my API to support ExternalForm. This is disappointing, since I pushed to get these changes so that I could use them in my OpenCL package in an unmodified Squeak 4.1. My fault... since I'm the one who cared, I should have checked. FFI-Tests-jcg.4 adds a new test: #testBlitToAndFromExternalForm. It succeeds on Windows and fails on OS X. I don't know about Linux because I don't have a machine handy... does anyone know if the FFI plugin was updated for Squeak 4.1? John, when you release your next VM, can you rebuild SqueakFFIPrims? That would be great! Cheers, Josh

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VM Maker: VMMaker-dtl.181.mcz
by squeak-dev-noreply＠lists.squeakfoundation.org 11 Jun '10

11 Jun '10

Dave Lewis uploaded a new version of VMMaker to project VM Maker: http://www.squeaksource.com/VMMaker/VMMaker-dtl.181.mcz ==================== Summary ==================== Name: VMMaker-dtl.181 Author: dtl Time: 10 June 2010, 7:58:14 am UUID: d0f2702b-0d2d-4240-abae-429f27e55d7b Ancestors: VMMaker-dtl.180 Set unit test timeout in BitBltSimulationTest to permit tests to complete in Squeak trunk image. Use #timeout: explicit call to permit these tests to be loaded in an older image without pragma support. =============== Diff against VMMaker-dtl.180 =============== Item was added: + ----- Method: BitBltSimulationTest>>setUp (in category 'running') ----- + setUp + (self respondsTo: #timeout: ) + ifTrue: [self perform: #timeout: with: 10] + !

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Problem starting opencobalt...
by Casimiro de Almeida Barreto 09 Jun '10

09 Jun '10

Following instructions (executing "CProjectMorph open: CobaltModularPanel" results in message telling that cannot open log file & next it will try to open log at /home/tapple/celery/cobalt...) There are also issues related to UUID (try to create from empty string) and with a missing left.png file (I assume there will be other png files if I pass this error message). Best regards, CdAB

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VM Maker: VMMaker-dtl.180.mcz
by squeak-dev-noreply＠lists.squeakfoundation.org 06 Jun '10

06 Jun '10

Dave Lewis uploaded a new version of VMMaker to project VM Maker: http://www.squeaksource.com/VMMaker/VMMaker-dtl.180.mcz ==================== Summary ==================== Name: VMMaker-dtl.180 Author: dtl Time: 6 June 2010, 12:30:29 pm UUID: d323ff5d-c1b2-40b0-a27c-034d72c53a2a Ancestors: VMMaker-dtl.179 ObjectMemoryVariablesTest must initialize ObjectMemory constants in #setUp (otherwise tests fail when first loaded from Monticello) =============== Diff against VMMaker-dtl.179 =============== Item was added: + ----- Method: ObjectMemoryVariablesTest>>setUp (in category 'running') ----- + setUp + ObjectMemory initializeConstants!

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Vm-dev June 2010