Function concurrency

Eample

async function concurrencyTest(paralelism = 5, total = 100) {
    const startTime = Date.now();
    const taskList = Array.from({ length: total })
        .fill(1)
        .map((_v, idx) => () => sleep(50, idx));

    console.log(tasklist);
    const result = await concurrency(taskList, paralelism);
    console.log('TimeCost:', Date.now() - startTime);

    return result;
}

await concurrencyTest(10);
await concurrencyTest(100);
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