August 2010 - Pharo-dev - lists.pharo.org

Re: [Pharo-project] What is correct way to save image automatically in background?

by John M McIntosh

On 2010-07-23, at 9:03 AM, Yanni Chiu wrote: > Here's my understanding of how it works. Garbage collection is completed before the Unix fork system call is made. At the moment of the fork, the original server VM process and the new image saving VM process share the exact same pages in the Unix OS - due to "Unix copy-on-write memory management". > > Immediately after the fork, the server VM process continues processing requests. Meanwhile, the image saving VM process proceeds to save the image. As each process continues execution, they will "dirty" their memory pages. Each dirty page means that that page is no longer shared between the two processes - leading to increased OS memory resources being allocated to the two processes. > > If the server VM process is very active, then a lot of dirty pages will be created, before the image saving VM process can complete. So, running the image saving process at a lower priority may actually be detrimental. > > One thing that occurs to me now, is whether or not the garbage collection is completed before the fork. If not, and it's done first thing by the image saving process, then it will be as you describe - the whole memory gets copied anyway. > > -- > Yanni Let me clarify a few things. First the Copy On Write only makes a copy of the original page if the page is going to be written to. Now *usually* 99% of the write activity is in young/new space which starts with zero bytes of memory after the Full GC is triggered. So as the saving task is writing out say the 0-100MB of memory, the running VM is busy allocating and writing to objects at 100+MB so there will be no effect on pages 0-100MB. Of course there are some updates into the 0-100MB area but that is rare as compared to write activity in new space. So if the process doing the write runs at a lower priority it shouldn't have an impact on the process running the VM. The danger is that a full GC should occur which would cause a compaction, but a server image should not be doing full GC more than a few times per hour.... Maybe never... -- =========================================================================== John M. McIntosh <johnmci(a)smalltalkconsulting.com> Twitter: squeaker68882 Corporate Smalltalk Consulting Ltd. http://www.smalltalkconsulting.com ===========================================================================

Aug. 3, 2010

Re: [Pharo-project] [update 1.2] #12080

by Henrik Sperre Johansen

On 03.08.2010 23:28, Levente Uzonyi wrote: > On Tue, 3 Aug 2010, StÃ©phane Ducasse wrote: > >> 12080 >> ----- >> >> - Issue 1298: CrLfFileStream not properly initialized on Mac OS. >> Thanks Andrew Black and Carlo Teixeira. > > CrLFFileStream? That shouldn't be used anywhere. It was superseded by > MultiByteFileStream. In Squeak [CrLfFileStream new] will return a > MultiByteFileStream. > > > Levente Yes, in March this year the same was done in Pharo. The issue was from october '09 though :) Cheers, Henry

Aug. 3, 2010

Re: [Pharo-project] Telling the OS that the VM wants focus

by John M McIntosh

Many things come to mind, one is to use some of the old text to voice features of squeak and have the computer yell at you when it's ready... That should work on all platforms that support sound. More subtle and complex would be to use Alien/FFI and talk to the operating system's notification/alert API. On 2010-08-03, at 12:51 AM, Max Leske wrote: > Hi folks > > The project I'm currently working on requires that I have to wait frequently for computations / operations to complete. To control the status I used progress bars wherever possible. Now, since the operations might take several minutes I like to sometimes switch to another Desktop, maybe read an e-mail or an article. > I'd find it rather useful if the OS would notify me that the VM needs my attention as soon as the operations have completed or if there was an error during execution, so that I don't have to go and check every 30 seconds. Is there an existing way to do this? If not, I'd like to propose this as a feature for a future release (although I don't have an inkling how one would accomplish this...). > > Cheers, > Max > _______________________________________________ > 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 ===========================================================================

Aug. 3, 2010

Re: [Pharo-project] Default end of line on mac osX

by John M McIntosh

Well actually Smalltalk isMacOS9 can just answer false since a Pharo based image will never run on macintosh OS 9 (aka pre os-x) However which system attribute are you using? http://isqueak.org/getAttributeIntoLength what you think might be safe might surprise/bite you.... On 2010-08-03, at 1:38 PM, StÃ©phane Ducasse wrote: > Hi guys > > I'm working on merging the changes 1298 about the guess of default end of line. > And I would like to know on mac os x (compared to Os9) what is the default > character of end of line. I thought it was CR > > since the previous code was > > ((OSPlatform osVersion) beginsWith: 'darwin') > ifTrue: [^ self defaultToCR] > ifFalse: [^ self defaultToLF]] > > > but carlo wrote > > Smalltalk isMacOS9 ifTrue: [^ self defaultToCR] ifFalse: [^ self defaultToLF]]. > > and I have some doubts because 'darwin' should be mac os x > > 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 ===========================================================================

Aug. 3, 2010

Re: [Pharo-project] Strange Smalltalk vmVersion

by John M McIntosh

http://isqueak.org/getAttributeIntoLength where indexNumber = 1004, return CFBundleShortVersionString and interpreterVersion Maybe you want 1006 indexNumber = 1006, return build string, which is say 'Mac Carbon 3.8.18b3 10-Apr-08 >DC0EAF5D-C46C-479D-B2A3-DBD4A2DF95A8<' Or what are you looking for? On 2010-08-03, at 12:49 PM, StÃ©phane Ducasse wrote: > I will add a method comment! > > Stef > > On Aug 3, 2010, at 9:28 PM, Adrian Lienhard wrote: > >> That's the version of the image with which the interpreter was generated. >> >> Adrian >> >> On Aug 3, 2010, at 18:50 , StÃ©phane Ducasse wrote: >> >>> Hi john >>> >>> Smalltalk getSystemAttribute: 1004 >>> returns >>> 'Squeak3.8.1 of ''28 Aug 2006'' [latest update: #6747] Squeak VM 4.2.4b1' >>> >>> do you know how we can fix that? >>> >>> Stef >>> >>> _______________________________________________ >>> Pharo-project mailing list >>> Pharo-project(a)lists.gforge.inria.fr >>> http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project >> >> >> _______________________________________________ >> Pharo-project mailing list >> Pharo-project(a)lists.gforge.inria.fr >> http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project > > > _______________________________________________ > 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 ===========================================================================

Aug. 3, 2010

Re: [Pharo-project] Problem with InstructionPrinter?

by Levente Uzonyi

On Tue, 3 Aug 2010, James Ladd wrote: > > Is that example the recommended way to see a dump of the bytecodes for a method? Yes, but you can also explore the CompiledMethod to see it in a structured form. Levente > > > >> Because there are special primitives for that. Try this: >> >> String streamContents: [ :stream | >> (YourClass >> #first) longPrintOn: stream indent: 0 ]. >> >> >> Levente > >

Aug. 3, 2010

Re: [Pharo-project] Extending SUnit [was Re: Autotest, proof-of-concept [was: About TDD and Pharo]]

by Alexandre Bergel

> TestResult announcer on: TestCaseStarted do: [:event | Transcript show: 'new test started']. Hum... I personally find unintuitive to register on the result. Why the result and not the suite or the test case? This means that there is only one announcer in the system? Anyone can provide an opinion on this point? Cheers, Alexandre > > > > > Laurent > > > > > > > > Stef > > > > > > > > Cheers, > > > Alexandre > > > > > > > > > > > >> > > >>> > > >>> Cheers, > > >>> Alexandre > > >>> -- > > >>> _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: > > >>> Alexandre Bergel http://www.bergel.eu > > >>> ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. > > >>> > > >>> > > >>> > > >>> > > >>> > > >>> > > >>> _______________________________________________ > > >>> Pharo-project mailing list > > >>> Pharo-project(a)lists.gforge.inria.fr > > >>> http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project > > >> > > >> > > >> _______________________________________________ > > >> Pharo-project mailing list > > >> Pharo-project(a)lists.gforge.inria.fr > > >> http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project > > > > > > -- > > > _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: > > > Alexandre Bergel http://www.bergel.eu > > > ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. > > > > > > > > > > > > > > > > > > > > > _______________________________________________ > > > Pharo-project mailing list > > > Pharo-project(a)lists.gforge.inria.fr > > > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project > > > > > > _______________________________________________ > > Pharo-project mailing list > > Pharo-project(a)lists.gforge.inria.fr > > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project > > > > _______________________________________________ > > Pharo-project mailing list > > Pharo-project(a)lists.gforge.inria.fr > > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project > > -- > _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: > Alexandre Bergel http://www.bergel.eu > ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. > > > > > > > _______________________________________________ > Pharo-project mailing list > Pharo-project(a)lists.gforge.inria.fr > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project > > _______________________________________________ > Pharo-project mailing list > Pharo-project(a)lists.gforge.inria.fr > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.

Aug. 3, 2010

Re: [Pharo-project] How detect a primitve?

by Levente Uzonyi

On Wed, 4 Aug 2010, James Ladd wrote: > > Hi All, > > Im working on the bytecodes for methods and I am wondering, how can I tell > if a compiled methods bytecode contains (starts) with a primitive, and which > primitive it is? See CompiledMethod >> #primitive. Levente > > Rgs, James. >

Aug. 3, 2010

[Pharo-project] How detect a primitve?

by James Ladd

Hi All, Im working on the bytecodes for methods and I am wondering, how can I tell if a compiled methods bytecode contains (starts) with a primitive, and which primitive it is? Rgs, James.

Aug. 3, 2010

Re: [Pharo-project] [update 1.2] #12080

by Levente Uzonyi

On Tue, 3 Aug 2010, StÃ©phane Ducasse wrote: > 12080 > ----- > > - Issue 1298: CrLfFileStream not properly initialized on Mac OS. Thanks Andrew Black and Carlo Teixeira. CrLFFileStream? That shouldn't be used anywhere. It was superseded by MultiByteFileStream. In Squeak [CrLfFileStream new] will return a MultiByteFileStream. Levente > > Lot of conflicts on this one.... > > Stef > _______________________________________________ > Pharo-project mailing list > Pharo-project(a)lists.gforge.inria.fr > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project >

Aug. 3, 2010