Which environment?

I thought the Pharo base image (3.10 with a few fonts & Balloon3d added) running on Windows was looking pretty stable. But after an hour of editing code --an hour since the last save—Squeak has abandoned me. It is unresponsive.

Trying both control and alt in combination with ‘.’, ‘l’ (lower case L), ‘c’, does nothing apparently useful. I tried a few other weird combos I thought I saw, but nothing visibly changed.

 

The process stack reported by Vista shows it to be incurring page-faults like mad. [OK, that has subsided while I typed this email.] My machine has 4 GB of RAM, I am running two instances of internet-explorer, and I have turned off the Windows search-indexing service. I know Vista has a guess-the-next-program pre-loader that could be a little overzealous in displacing programs from RAM… but still… it seems like this 101MB program shouldn’t generate any page faults when the other two leading memory pigs are using less than double that much virtual memory. Vista’s Resource Monitor claims I am using only 43% of physical memory. The page-fault count for Squeak.exe doubled while I typed this message.

 

When I click the Squeak icon on the window frame of the running copy (upper left on Windows), I do see the menu for VM Preferences. It shows me the menu and allows me to invoke actions. It will allow me to toggle the “Show output console” on and off. The output console shows me changes to memory (as I have that option checked). I can use my mouse wheel to scroll this console. Control-‘.’ and Control-c (and lower case L) in this console do not change anything.

 

After mucking around in the console area, I am now getting “WARNING: event buffer overflow” just moving my mouse around in squeak. After turning the console off, the pointer is now invisible except when you click. It appears that the overall squeak window is repainting itself properly.

 

-- Help me debug it

 

I have an interest in building a commercial application in Squeak. The FAQs says squeak is stable. Given the active community of developers (including The Great Ones), I imagine that it is stable, and that I am just doing something dumb… repeatedly. However, for Squeak to be adopted more broadly, it can’t go zombie on users, even when the user does something dumb. That’s an absolute.

 

What is the longest uptime a squeak image has ever endured (while doing something useful)? Which version was that and on what platform?

 

So I am willing to work to help make squeak more robust, but as a complete newbie with it, I need much guidance. So right now, with this hung-up image, what should I do? Should I attach to it with gdb? And if so, then what? [If the internal process control is working, I won’t be able to make heads or tales out of it from gdb, right?]  Or can I launch another squeak and send it a signal in some way [is it listening?]? What is most useful in this case?

 

[Is there a way in Windows/Vista to signal an app so as to force a core dump?]

 

Thanks in advance,

Cam

PS: I want to emphasize that I do not care about the code lost in this particular instance (it was tutorial code), instead I am looking for a stable free development environment… and I’m willing to help make one.

 

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Hello Steve,

SW> The concerns I have over which environment to use goes like this:
<snipped concerns>

In addition I think the environment should be in wide use too. So that
people who already have Squeak can do the tutorial without downloading
another variant of Squeak.

SW> I've restarted writing two chapters in my updated tutorial
SW> more than once now because I keep doubting which choice is optimal.

If you could make sure at least the code runs in as many versions as
possible that would be great.


Cheers,

Herbert  

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I'm doing your tutorial now, with Squeak3.10.2-7179-basic. The only
issues I've had with it when I do something wrong, like an infinite
loop in the mouse handling routines... .BAM. 7 zillion debuggers.

On Sat, Jan 10, 2009 at 11:04 AM, Herbert König <[hidden email]> wrote: _______________________________________________
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Steve,

Your tutorial is great (as far as I’ve gone: late section 2). I almost skipped straight to downloading the code and reviewing it… and then I thought, no, I should walk through it and see how Squeakers work. Anybody with some knowledge of using modern windowing systems and basic smalltalk should be able to use it, even with different menus.

 

I want to emphasize that these lock-ups I keep encountering with Squeak on Vista have occurred with pretty much any Squeak 3.10 image I have started with, and under a host of situations, but usually just perusing code in a browser…  - a core activity for a smalltalk coder.

 

Images tried – with the exception of Croquet, the rest were 3.10 VMs.

 

Squeak3.10.2-7179 – the basic release

Pharo0.1

Croquet SDK 1.0.18 (using its vm of course)

Cassou’s images (sp?)

 

--

The fact that the console can be turned on and off (while the rest of squeak appears ‘locked up’) and that it displays data for us is suggests two things: 1) it is not stuck in an infinite loop in the GC, and 2) basic threading/time-slicing is working. So, is the user (world-menu) thread being lost? Can I protect it… or add another thread that makes certain the core user thread is always up? … Who can point me in the right direction? Perhaps I can add controls to the same place the VM controls (available on the outer-most window-frame menu) are controlled from. (Tell me where to look for that please.) There are likely several band-aid approaches that will help make it usable, even if I can’t fix the core problem.

 

Ryan Zerby writes:

> I'm doing your tutorial now, with Squeak3.10.2-7179-basic. The only

issues I've had with it when I do something wrong, like an infinite

loop in the mouse handling routines... .BAM. 7 zillion debuggers.

 

On which platform? I too have encountered the 7-zillion debuggers problem… just browsing. Or clicking terminate on the debugger.

 

I would like help to make Squeak usable. Yesterday I had an image lock up after less than one minute of uptime, and all I did was launch Monticello to go get my code. Something is broken -- perhaps not on all platforms, but at least on my two Vista machines. [And these two machines have been stable for all other apps: eclipse-java, python report generators that grind for about 12 hours per week, and various browsers and editors.

 

If I want to alter the root menus on Squeak, where do I get started?

 

On which forum should I take up this matter? Release?

 

Thanks folks,

Cam

 

 

 

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Thanks for the feedback.

- Steve

On Jan 10, 2009, at 11:43 AM, "Ryan Zerby" <[hidden email]> wrote:

I'm doing your tutorial now, with Squeak3.10.2-7179-basic. The only
issues I've had with it when I do something wrong, like an infinite
loop in the mouse handling routines... .BAM. 7 zillion debuggers.

On Sat, Jan 10, 2009 at 11:04 AM, Herbert König <[hidden email]> wrote:
Hello Steve,

SW> The concerns I have over which environment to use goes like this:
<snipped concerns>

In addition I think the environment should be in wide use too. So that
people who already have Squeak can do the tutorial without downloading
another variant of Squeak.

SW> I've restarted writing two chapters in my updated tutorial
SW> more than once now because I keep doubting which choice is optimal.

If you could make sure at least the code runs in as many versions as
possible that would be great.


Cheers,

Herbert

_______________________________________________
Beginners mailing list
[hidden email]
http://lists.squeakfoundation.org/mailman/listinfo/beginners

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[hidden email]
http://lists.squeakfoundation.org/mailman/listinfo/beginners




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