[js_test:all_collection_stats] performance test $shardedDataDistribution: 1000 00:00:05
[js_test:all_collection_stats] performance test $shardedDataDistribution: 2000 00:00:10
[js_test:all_collection_stats] performance test $shardedDataDistribution: 3000 00:00:16
[js_test:all_collection_stats] performance test $shardedDataDistribution: 4000 00:00:23
[js_test:all_collection_stats] performance test $shardedDataDistribution: 5000 00:00:33

(function() {
'use strict';

const numberOfCollections = 5000;

// Configure initial sharding cluster
const st = new ShardingTest({shards: 3});
const mongos = st.s;
const dbName = "test";
const db = mongos.getDB(dbName);

let iterator = 1000;
let total = 0;
while (total < numberOfCollections) {
    // Insert data to validate the aggregation stage
    for (let i = 0; i < iterator; i++) {
        const coll = "coll" + total;
        // assert.commandWorked(db.createCollection(coll));
        assert(st.adminCommand({shardcollection: dbName + "." + coll, key: {skey: 1}}));
        total++;
    }

    let it = 0;
    const start = new Date();
    const cursor = mongos.getDB("admin").aggregate([{$shardedDataDistribution: {}}]);
    while (cursor.hasNext()) {
        const data = cursor.next();
        it++;
    }
    const end = new Date();

    const time = new Date(end - start).toISOString().slice(11, 19);
    print(`performance test $shardedDataDistribution: ` + total + ` ` + time);

    assert.eq(it, total + 1);
}

st.stop();
})();