Re: Separation into dock widgets

[John Swensen]

On Apr 30, 2011, at 4:44 AM, Jacob Dawid wrote:

> I went ahead and did rand(10000, 10000) and it works flawlessly. There is no 
> need to optimize unless there is a problem that requires it.

Jacob,
I just went and looked at the code for the symbol_record class and it looks 
like the copy constructor only increased a reference counter.  It actually 
doesn't do a deep copy as you expected.  I noticed this because I went back to 
check why rand(10000,10000) in Quint wasn't using 2 times as much memory as the 
same command in just Octave.  I think this implies that despite the best 
intentions of OctaveLink, carrying around a reference to variables still being 
manipulated by the Octave internals destroy and thread-safetiness that 
OctaveLink is intended to provide, as you could access these references outside 
the Readline idle event loop.

I don't know if it is a related problem (I expect it is), but if you try to 
clear the large random matrix, Quint crashes.
Try:
zz = rand(10000,10000);
clear zz
This crashes every time on both Ubuntu and OSX when updating the 
VariablesDockWidget. It doesn't happen for certain smaller variables, but I'm 
not sure why.

John Swensen