compares the time of doing a single mongo bulk write vs divide all operations in N bulks

single mongo bulk vs multiple.js

function createRandomObj(fieldCount, allowNested) {
    var generatedObj = {};

    for(var i = 0; i < fieldCount; i++) {
        var generatedObjField;

        switch(randomInt(allowNested ? 6 : 5)) {

            case 0:
            generatedObjField = randomInt(1000);
            break;

            case 1:
            generatedObjField = Math.random();
            break;

            case 2:
            generatedObjField = Math.random() < 0.5 ? true : false;
            break;

            case 3:
            generatedObjField = randomString(randomInt(4) + 4);
            break;

            case 4:
            generatedObjField = null;
            break;

            case 5:
            generatedObjField = createRandomObj(fieldCount, allowNested);
            break;
        }
        generatedObj[randomString(8)] = generatedObjField;
    }
    return generatedObj;
    
    function randomInt(rightBound){
        return Math.floor(Math.random() * rightBound);
    }

    function randomString(size){
        var alphaChars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
        var generatedString = '';
        for(var i = 0; i < size; i++) {
            generatedString += alphaChars[randomInt(alphaChars.length)];
        }

        return generatedString;
    }
}

function chunkArrayInGroups(arr, size) {
  var myArray = [];
  for(var i = 0; i < arr.length; i += size) {
    myArray.push(arr.slice(i, i+size));
  }
  return myArray;
}

function getInserts(count) {
    
    var objs = [...Array(count).keys()].map(_ => {
    
        var item = createRandomObj(4, false);
        
        return {
            "insertOne": {
                "document": item,
            }
        };
    });
    
    print(`[${Date()}] - gerado commands para ${count} itens`);
    
    return objs;
}

function executeBulk(bulkOperations) {

    var result = db.orders.bulkWrite(bulkOperations, { "ordered": false });

    print(`${bulkOperations.length] operations done`);
}


function doBulk(itenCount, bulkCount) {
    var start = new Date();

    var operations = getInserts(itenCount);
    var part = itenCount / bulkCount;
    var bulkOperations = chunkArrayInGroups(operations, part);
    
    for(var i = 0; i < bulkCount; i++)
    {
        executeBulk(bulkOperations[i]);
    }
    
    var end = new Date();
    const diffTime = Math.abs(end - start);
    print(`total time = ${diffTime} ms`);
}

doBulk(10000, 1);
doBulk(10000, 2);
doBulk(10000, 3);