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From: "Andreas Raab" <andreas.raab at gmx.de>
Sent: Tuesday, July 13, 2010 11:29 AM
To: "The general-purpose Squeak developers list" 
<squeak-dev at lists.squeakfoundation.org>
Subject: [squeak-dev] Re: UI lockup in Squeak 4.1

> On 7/13/2010 6:39 AM, Rob Withers wrote:
>> The low-space watcher is running, at least before the problem starts. I
>> do eventually run out of memory, but the uninterruptable state happens
>> before this.
>
> In which case you want to do the following:
> * Launch your app and wait until it's in the "growing state"
> * Hit F2 and from the VM's preference menu choose "Debug" and then "Print 
> all processes"
>
> This will dump a list of all the call stacks of all processes. One of them 
> is the culprit consuming memory and you'll probably be able to tell 
> quickly from just looking at it (if not, you can email the output here but 
> it typically takes a domain expert to understand what's going wrong).
>

Thanks for this pointer, Andreas.

This time it was a Cog VM which spasmed, which I use for my client (Squeak 
4.1 for server for use with linux vm - I have no ability to compile a linux 
Cog vm:  would love if someone posted one that could be launched headless 
for my webhost).

It started running at 100% and I did your F2 -> Debug Options -> Print all 
processes.  It started dumping a LOT to the Debug Console, then it froze, 
still at 100%, but no increase in memory now and it went (Not Responding) 
and greyed out the window.

Luckily, I was able to see enough of the stack that was causing problems. 
It is infinitely looping in this method:

LanguageEnvironment class>>#localeID: localeID
	^self knownEnvironments at: localeID ifAbsent: [self localeID: (LocaleID 
isoLanguage: 'en')]

This has nothing to do with my code, except I must be calling something that 
enters this loop.  It happens in both Cog (Windows) and Squeak4.1 (Linux 
<headless> and Windows).

Not sure how to fix this.

Rob

> Cheers,
>   - Andreas
>