D Programming Language (Dlang) - Example Garbage Collection ProfileStats

app.d

import std.stdio;
import core.memory;
import std.algorithm.mutation;

void main()
{
    int[] list;
    int[] list2;
    int[] result;

    writeln("start");

    foreach (_; 0 .. 10)
    {

        foreach (i; 0 .. 2000)
        {
            list ~= i;
            list2 ~= i + 1;
        }

        result = list ~ list2;
        writeln(result.length);

        // remove
        foreach (i; list)
        {
            list.remove(i);
        }

        // force more collections, you can remove this to compare
        GC.collect();

        // add more
        foreach (i; 0 .. 2000)
        {
            list ~= i;
            list2 ~= i + 1;
        }

        list = null;
        list2 = null;
    }

    writeln("\nGC Stats");
    auto ps = GC.profileStats();
    writeln("numCollections: ", ps.numCollections);
    writeln("totalCollectionTime: ", ps.totalCollectionTime);
    writeln("totalPauseTime: ", ps.totalPauseTime);
    writeln("maxPauseTime: ", ps.maxPauseTime);
    writeln("maxCollectionTime: ", ps.maxCollectionTime);
}