Math Problem Statement
Fill the last 3 tabels
Solution
The image shows a scheduling problem for three processes (P1, P2, and P3). It is asking for three different scheduling techniques:
- First In First Out (FIFO).
- Priority without preemption.
- Priority with preemption.
Each process has the following parameters:
-
P1:
- Execution Time: 2 units
- I/O Time: 2 units (at time 3)
- Priority: 3
-
P2:
- Execution Time: 4 units
- I/O Time: 3 units (at time 2)
- Priority: 2
-
P3:
- Execution Time: 2 units
- I/O Time: 1 unit (at time 2)
- Priority: 1
Now, I will explain and fill each of the tables for the scheduling strategies:
1. FIFO (First In First Out):
In FIFO, the processes are scheduled in the order they arrive, without considering priority. Since all processes can start at the same time (t=0), the scheduling will follow the order of P1, P2, and P3.
- P1 starts at time 0 and runs for 2 units, finishing at time 2.
- P2 starts at time 2 and runs for 4 units, finishing at time 6.
- P3 starts at time 6 and runs for 2 units, finishing at time 8.
This will look like:
P1: ████
P2: ████████████
P3: ████████
2. Priority Scheduling without Preemption:
In this case, we schedule processes based on their priority. Since P3 has the highest priority (1), it will go first, followed by P2 (priority 2), and P1 (priority 3).
- P3 starts at time 0 and runs for 2 units, finishing at time 2.
- P2 starts at time 2 and runs for 4 units, finishing at time 6.
- P1 starts at time 6 and runs for 2 units, finishing at time 8.
The output will be:
P3: ████
P2: ████████████
P1: ████████
3. Priority Scheduling with Preemption:
Here, the processes are scheduled based on their priority, but a higher-priority process can preempt a lower-priority process if it becomes available.
- P3 starts at time 0 and runs for 2 units, finishing at time 2.
- P2 starts at time 2 and runs for 1 unit. After 1 unit (at time 3), P1 becomes ready, but since P2 has a higher priority than P1, it continues running for its remaining 3 units, finishing at time 6.
- P1 starts at time 6 and runs for 2 units, finishing at time 8.
This will result in:
P3: ████
P2: ████████████
P1: ████████
Would you like any additional details on how these schedules were determined?
Here are 5 questions related to this concept:
- How does the priority-based preemptive scheduling differ from non-preemptive?
- What is the main advantage of using preemptive scheduling over FIFO?
- How do I/O wait times influence scheduling decisions in a real-world system?
- What happens when two processes have the same priority level in priority-based scheduling?
- How could round-robin scheduling be applied to the same set of processes?
Tip: Preemptive scheduling allows more important (higher priority) tasks to execute earlier, but it can lead to more frequent context switches, which might reduce efficiency.
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Math Problem Analysis
Mathematical Concepts
Scheduling Algorithms
First In First Out (FIFO)
Priority Scheduling
Preemption
Formulas
-
Theorems
FIFO Scheduling Rule
Priority Scheduling Rule
Suitable Grade Level
University (Computer Science)
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