A simple scheduler in Python

Here’s a simple scheduler simulator in Python that you can download from here. You give it a list of processes and scheduling algorithm you want to be used for scheduling and as result you get a simple output like this which shows you the sequence of the processes running in intervals:

System starts up
002.000: Algorithm SPN is in use
004.000: Process 001 Created
004.000: Process 001 -> readyQ
004.000: Process 001 -> CPU
006.100: Algorithm MLFQ is in use
007.300: Process 002 -> swapped out

This program is interesting in several aspects:

• Firstly, it helps you to grasp ideas behind scheduling algorithms in OS.
• Secondly, it takes advantage of threading to simulate IO operations.
• Also, it reads its input from an XML file, worth taking a look.
• And finally, it’s in Python.

Unfortunately, because of lack of enough time for this project, it’s not as beautiful as I liked, but as a proverb says, “Something is (most of the times) better than nothing.”