import core.thread;
import std.stdio;
import std.algorithm;
import std.datetime.stopwatch;

const numFibers = 1_000_000;
const stackSize = 4 * 1024 * 1024; // 4 Mb

void worker() {
    Fiber.yield();
}

void main() {
    auto fibers = new Fiber[numFibers];

    auto results = benchmark!({
        foreach(ref f; fibers) f = new Fiber(&worker, stackSize, 0);
    }, {
        fibers.each!(f => f.call());
    })(1);

    writefln("create: %s", results[0]);
    writefln("run:    %s", results[1]);
}

$ ldc2 -O3 --run test.d
create: 2 secs, 352 ms, 162 μs, and 3 hnsecs
run:    236 ms, 594 μs, and 5 hnsecs