What to do if frozen ?

Patrick Dupre pd520 at york.ac.uk
Tue Aug 25 17:35:46 UTC 2009

On Tue, 25 Aug 2009, Patrick O'Callaghan wrote:

> On Tue, 2009-08-25 at 17:38 +0100, Patrick Dupre wrote:
>>> On Tue, 2009-08-25 at 16:40 +0100, Patrick Dupre wrote:
>>>> Hello,
>>>> I am a perl-Tk application (Sterra.pl)  with seems does not want to give
>>>> me the hand back because of swapping !
>>> If you say absolutely nothing about what your application is for or
>>> where it came from, how do you expect people to help you?
>> What do you need to know about my application ?
> Put it this way: you said "my app is swapping, why is this"? The only
> coherent answer is that its virtual memory demand is too high for your
> machine (in combination with all the other apps you're running). As to
> *why* it's too high, it could be anything from a basic requirement (e.g.
> you're inverting huge matrices in the most simplistic way) to a simple
> memory leak. That's why it's important to say what the app is doing.
> Also, does it show this behaviour all the time, or only after it's been
> running for a long time?

The serious problems appear after I updated from fedora 10 i386 to
fedora 11 x86_64.

I do agree that I may have memory leak, and I tried to work to it but I
do not see what else I can do. I am using perl calling CPP calling perl.
I do not know how to have full control on the memory. I do my 
deallocations as well as I can.
But, as I said I identified similar behavior with firefox. In addition
I also doubled the memory size (compared to i386).
My calculation tells me that I only need ~350 000 Mo (204 * 204 * double) !
for the matrix diagonalization. However, I do not have 100% control under 
the packages that I am using: PDL and Minuit (in term of memory allocation). 
If they do not it right, what can I do ?

By the way, when your application takes 67% of the memory and consumes
only 2% of the CPU (and no additional application is using the CPU), it 
looks like that you would like to do something because their are still 33% 
of the memory available !


>> I even had the same behavior with firefox !
> I have sluggish behaviour with Firefox (it gets bigger and slower over
> time), but it's definitely caused by an add-on. I'm in the process of
> discovering which one.
> poc

  Patrick DUPRÉ                      |   |
  Department of Chemistry            |   |    Phone: (44)-(0)-1904-434384
  The University of York             |   |    Fax:   (44)-(0)-1904-432516
  Heslington                         |   |
  York YO10 5DD  United Kingdom      |   |    email: pd520 at york.ac.uk

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