[Vm-dev] Re: [squeak-dev] What is the upper memory limits of Cog?

Chris Muller asqueaker at gmail.com
Fri Sep 26 23:02:35 UTC 2014

On Fri, Sep 26, 2014 at 7:08 AM, David T. Lewis <lewis at mail.msen.com> wrote:
> On Thu, Sep 25, 2014 at 11:28:04PM -0500, Chris Muller wrote:
>> I have had to put memory-checking into my code and terminate "stale"
>> resources when it hits the ceiling.  Part of my memory-checking logic
>> relies on (Smalltalk vmParameterAt: 3) to estimate available memory,
>> but since it is returning -868260916 (that's right, --negative--) for
>> that value, my assumptions that it would always be positive were wrong
>> and that explains why the memory-checking is not working correctly.
>> Is something possibly wrong that this is negative?  Am I supposed to
>> take the absolute value of it?
> It's probably a VM buglet, an unsigned address is being returned as a signed integer.

Indeed, I had installed the 3072 VM but forgot to refresh my scripts
which were still pointing to a older VM.  Oops!

Since then, I have not seen a negative value for that in 3072.


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