OSPS

Introduction

OSPS (Operating System's Process Scheduler) is a node module that simulates the process scheduling algorithms.

Installation

npm install osps

Usage

var osps = require("./osps.js");
var sim = osps.schedule(proc_info);

Inputs

The proc_info object should contain the following:

• "proc_list": A list of process objects. Each of these objects should look like:

    { 
  
    "proc_id": 1, //A positive unique number identifying each process
  
    "len": 10, //A number showing the amount of CPU time that process needs to complete
  
    "arrival_time": 2, //A number showing the simulation time at which the process enters the system
  
    }

• "cs_time": A number showing the amount of context switch time required. 0 if negligible.

• "alg": A string that specifies the algorithm of the simulation. Can be one of:

"fifo" (First In First Out), "sjf" (Shortest Job First), "rr" (Round Robin)

• "quanta": For quanta based algorithms (like "rr"), specifies the amount of quanta at each turn.

Outputs

Output is a list of objects, each one showing one block of execution that can be process execution, context switch or CPU idle time. Each object looks like this:

      {

      "proc_id": 1, //shows the id of the process that is being executed in this block, -1 if cs_time or is_idle is true

      "begin_time": 10, //begin time of this block of execution

      "end_time": 15, //begin time of this block of execution

      "is_cs": false, //true if this block is for context switching

      "id_idle": false, // true if during this block cpu is idle

      }