put.js

"use strict";
const AWS = require("aws-sdk");
const dynamodb = new AWS.DynamoDB({
  region: "us-east-2"
});

(async function() {
  console.log("start");
  let wait = [];
  for (let i = 0; i < 10000; i++) {
    wait.push(add_dummy());
  }
  const result = await Promise.all(wait);
  console.log(count(result));
})();

function count(array) {
  let success = 0;
  let fail = 0;
  for (let i = 0; i < array.length; i++) {
    if (array[i] === 0) {
      success++;
    } else {
      fail++;
    }
  }
  return {
    success: success,
    fail: fail
  };
}
function unixtime() {
  const d1 = new Date();
  const d2 = d1.getTime();
  const d3 = parseInt(d2 / 1000);
  return String(d3);
}
async function add_dummy() {
  const id = Math.random()
    .toString(36)
    .slice(-8);
  const evaluated = Math.floor(Math.random() * Math.floor(1000)).toString();
  var params = {
    Item: {
      article_id: {
        S: id
      },
      evaluated_at: {
        N: evaluated
      },
      created_at: {
        N: unixtime()
      }
    },
    TableName: "hogehogetable"
  };
  let result = 0;
  try {
    await dynamodb.putItem(params).promise();
    result = 0;
  } catch (e) {
    console.log(`error = ${e}`);
    result = 1;
  }
  return result;
}

read.js

"use strict";

let AWS = require('aws-sdk');
let dynamodb = new AWS.DynamoDB({
    region: 'us-east-2'
});

(async function() {
  console.log("start");
  let wait = [];
  for (let i = 0; i < 100; i++) {
    wait.push(get_items());
  }
  const result = await Promise.all(wait);
  console.log(count(result));
})()

function count(array) {
  let success = 0;
  let fail = 0;
  for (let i = 0; i < array.length; i++) {
    if (array[i] === 0) {
      success++;
    } else {
      fail++;
    }
  }
  return {
    success: success,
    fail: fail
  };
}
async function get_items(key1, key2){
  const params = {
    ExpressionAttributeNames: {
      "#AD": "article_id",
      "#EV": "evaluated_at"
    }, 
    ConsistentRead: true,
    ProjectionExpression: "#AD,#EV", 
    TableName: "hogehogetable",
  };
  let result = 0;
  try {
    const response = await dynamodb.scan(params).promise();
    console.log("OK");
    result = 0;
  }
  catch (e) {
    console.log(`error = ${e}`);
    result = 1;
  }
  return result;
}