RE: [Axiom-developer] Memory leak in Axiom

[Vanuxem Grégory]

Hi,

> -----Message d'origine-----
> De : Page, Bill [mailto:address@hidden
> Envoyé : mercredi 22 juin 2005 01:11
> À : 'Vanuxem Grégory'
> Cc : address@hidden
> Objet : RE: [Axiom-developer] Memory leak in Axiom
>
>
> On Tuesday, June 21, 2005 3:43 PM Vanuxem Grégory wrote:
>
> > It seems that there is a memory leak in Axiom;
> >
> > Open a shell, type 'top' and observe residual and virtual memory.
> >
> > Open AXIOMsys and type
> >
> >  new(1000,1000,0.0)$Matrix(SF);
> >
> > and repeat this action.
>
> I can not reproduce this error using the Windows version
> of Axiom 0.1.4. This version of Axiom is based GCL 2.6.5.
> On windows I can monitor memory usage with Task Manager,
> Performance tab.
>
> What version of Axiom and operating system are you using
> for your test? What version of GCL was used to build Axiom?

GCL-2.6.6 on axiom patch 40

>
> > A (1000,1000) C double float array takes 7.63 Mb.
> >
> > If I alloc a contiguous storage memory array of 1000x1000,
> > amount of virtual and residual memory augment of 10Mb. It seems
> > it is never released.
> >
> > I haven't found this in gcl.
>
> Could you describe the test you use on GCL? What version of
> gcl are you using?

(make-array '(1000 1000) :element-type 'long-float :initial-element 0)

about 50 times

>
> >
> > Any idea ?
>
> If you repeat this process several times:
>

Sorry,
1) Open Axiom
4) display residual and virtural memory
-- avoid printing
new(1000,1000,0)$Matrix(SF);
-- memory has increased of 10Mb
new(1000,1000,0)$Matrix(SF);
-- memory has increased of 10Mb
new(1000,1000,0)$Matrix(SF);
-- memory has increased of 10Mb
new(1000,1000,0)$Matrix(SF);
-- memory has increased of 10Mb
new(1000,1000,0)$Matrix(SF);
-- memory has increased of 10Mb
new(1000,1000,0)$Matrix(SF);
-- memory has increased of 10Mb
new(1000,1000,0)$Matrix(SF);
-- memory has increased of 10Mb
.
.
.
a lot of times (axiom will crash) => xmalloc failed


Cheers,

Greg


>
> For example do this 5 times in a row, do you find that the
> total available memory is constantly decreasing?
>
> If this is not that case, but only occurs on the first
> iteration, then what you might be seeing is some kind of
> executable cacheing being done by the operating system.
> (Does linux do that? Some versions of Windows do. I see
> such an effect under Windows XP.)
>
> Regards,
> Bill Page.
>