Re: [Axiom-developer] Memory leak in Axiom : mistake

[Ralf Hemmecke]

Well, there is something else. How is Axiom supposed to behave in the 
following case? (See axiom--main--1--patch-40/mnt/linux/doc/book.dvi 
Section 1.15.1)

--start axiom
top:
  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
17381 hemmecke  16   0 44072 8492 3016 S  0.0  1.7   0:00.12 AXIOMsys

a:=new(1000,1000,0.0)$Matrix(SF);
b:=new(1001,1001,0.0)$Matrix(SF);

Now top says
17381 hemmecke  17   0 44116  21m 3060 S  0.0  4.3   0:00.34 AXIOMsys

)undo -2

And top says
17381 hemmecke  16   0 44116  21m 3088 S  0.0  4.3   0:00.34 AXIOMsys

I understand that due to %% and )undo previous results must be cached, 
but why doesn't )undo release memory? Do I read the values of the top 
command incorrectly?

Ralf

Vanuxem Grégory wrote:
> Hi,
>
> Sorry,
>
> Section 0.4.2 of axiom book => accessing earlier result.
> It's a little dangerous in term of memory management...
>
> Cheers,
>
> Greg
>
>
>
>
> > -----Message d'origine-----
> > De : address@hidden
> > [mailto:address@hidden la
> > part de Vanuxem Grégory
> > Envoyé : mercredi 22 juin 2005 03:10
> > À : Bill Page (E-mail)
> > Cc : address@hidden
> > Objet : RE: [Axiom-developer] Memory leak in Axiom
> >
> >
> > 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.
> >
> >
> >
> >
> > _______________________________________________
> > Axiom-developer mailing list
> > address@hidden
> > http://lists.nongnu.org/mailman/listinfo/axiom-developer
>
>
>
>
>
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