DICER

DistrIbuted Code ExecutoR

• Javascript Library to easily parallelize your code and execute it
• Master Slave architecture
• Job distribution via ronund robin
• Low latency transfer via sockets.

Pre-requisites

• You need a Master server setup with at least 1 slave connected to it
• The slaves need not be accessible publicly and can be behind a firewall or NAT
• The master should be accessible by the client
• Your parallelizable jobs must be defined in a class

Setup

• Step 1: Setup Master

import Master from "../server";

/**
 * port used is controlled by process.env.PORT
 * default value is 3000
 * */
const master = new Master();

• Step 2: Setup Slave

/**
 * @arg1 URL string
 * specifies the URL of the master
 *
 * @arg2 boolean logging
 * false by default. set to True to see execution logs
 * */
const slave2 = new Slave(
  process.env.MASTER_URL || "http://localhost:3000",
  true
);

• Step 3: Setup Client

import Library from "../library";
import { SlaveResponse } from "../protocol";

/**
 * We define a class with the functions to be distributed across the nodes
 * The @lib.exec decorator is used to mark a function as ready for distribution
 * */

class Job {
  @lib.exec
  static square(x: number): any {
    return x ** 2;
  }

  @lib.exec
  static cube(x: number): any {
    return x ** 3;
  }

  @lib.exec
  static sqrt(x: number): any {
    return Math.sqrt(x);
  }

  @lib.exec
  static arrayMult(x: number[], y: number[]): any {
    let ans = [];
    for (let i = 0; i < x.length; i++) {
      ans.push(x[i] * y[i]);
    }
    return ans;
  }
}

Usage

import assert from "assert";
import { SlaveResponse } from "../protocol";

interface SlaveResponse {
  result: any;
  time: number;
  error?: any;
}

const res: SlaveResponse = await Job.square(2);

const res2: SlaveResponse = await Job.sqrt(9);
console.log(`Took ${res2.time}ms `);

let arr1 = [1, 2, 3, 4, 5, 6, 7, 8, 9];
let arr2 = [10, 11, 12, 13, 14, 15, 16, 17, 18];

const re3: SlaveResponse = await Job.arrayMult(arr1, arr2);
if (res3.error) {
  //error handling goes here
}