[GAP Forum] Immutable lists and memory usage

[Keshav Rao Kini]

I see, that makes sense. Thanks!

-Keshav

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2011/2/8 Dmitrii V Pasechnik (Asst Prof) <Dima at ntu.edu.sg>

> IMHO it's an efficiency decision:
> ShrinkAllocationPlist calls the GC, and might be (very) slow.
>
> On 8 February 2011 11:35, Keshav Rao Kini <krkini at ntu.edu.sg> wrote:
> > Hello,
> >
> > Here is the result of some experimentation I did:
> >
> > gap> x := [];; for i in [1..100] do Add(x, i); od; MemoryUsage(x);
> MakeImmutable(x);; MemoryUsage(x); ShrinkAllocationPlist(x); MemoryUsage(x);
> > 512
> > 512
> > 416
> >
> > I'm wondering why ShrinkAllocationPlist isn't called automatically by
> MakeImmutable, since once I use MakeImmutable() it should be impossible to
> extend x or even to shrink it, if I understand correctly...
> >
> > -Keshav
> >
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