NethSam

Free CPU scheduling calculators and a SQL-to-ER diagram generator for computer science students.

OS Algorithms

FCFS
First Come First Serve
Runs in order of arrival.
Non-preemptive
SJF
Shortest Job First
Shortest burst runs first.
Non-preemptive
RR
Round Robin
Time quantum scheduler.
Preemptive
P
Priority
Lowest number runs first.
Non-preemptive
⇄
Compare
All four side by side.
Compare

Database

ER
ER Diagram Builder
Paste SQL, get an ER diagram.
SQL → ER