[GAP Forum] Immutable lists and memory usage

[Asst. Prof. Dmitrii (Dima) Pasechnik]

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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Dmitrii Pasechnik
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