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

[Ralf Hemmecke]

OK, let's do it again.

%axiom

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
27271 hemmecke  16   0 44072 8492 3016 S  0.0  1.7   0:00.13 AXIOMsys

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

27271 hemmecke  17   0 44116  21m 3060 S  0.0  4.3   0:00.33 AXIOMsys

)undo -2
27271 hemmecke  16   0 44116  21m 3088 S  0.0  4.3   0:00.33 AXIOMsys

)lisp (gbc 3)
27271 hemmecke  17   0 44116  25m 3088 S  0.0  5.2   0:00.40 AXIOMsys

That is funny. Why does AXIOMsys now use even more space???

Ralf

Vanuxem Grégory wrote:
> Hi,
>
> Le mercredi 22 juin 2005 à 06:01 -0400, Page, Bill a écrit :
>
> > On Wednesday, June 22, 2005 4:56 AM Ralf Hemmecke wrote:
> >
> >
> > > 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)
>
>
> Thanks for this information, I have to write a script that records my
> history and restore my variables.
>
>
> > > --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?
> >
> > Don't forget that Axiom runs as a lisp application (GCL). This means
> > memory allocation is dynamic and that memory usage can be affected by
> > when lisp decides to do garbage collection. You can force GCL to do
> > garbage collection and return unused memory. Try using the command:
> >
> >  )lisp (gbc 3)
> >
> > after the )undo -2
> >
> > On my Windows version of Axiom this returns some memory to the operating
> > system. I don't have the linux version here right now to try this.
> > Please let me know what you get.
>
>
> No memory released.
> A new matrix allocation re-increase used memory.
>
>
> Cheers,
>
>
> Greg
>
>
> > Regards,
> > Bill Page.