Measure Scheduling Latency Using Clock Functions

Measure scheduling latency at task switch points.

Requirements:

• Use clock_gettime(CLOCK_MONOTONIC) for precise timing
• Record timestamp before process yields (voluntary switch)
• Record timestamp when process resumes
• Calculate difference = scheduling latency
• Measure multiple switches and compute statistics
• Support both involuntary (time slice) and voluntary (yield) switches
• Print minimum, maximum, average latency
• Demonstrate effect of system load on latency
• Show histogram of latencies (optional)

Measurement Points:

1. Before calling yield() or sleep()
2. Immediately after resuming from yield/sleep
3. Before timer interrupt (involuntary preemption)
4. After returning from timer interrupt

Statistics to Collect:

• Minimum latency (best case)
• Maximum latency (worst case)
• Average latency (mean)
• Median latency (50th percentile)
• Standard deviation (jitter)

Test Scenarios:

• Low load: 2 processes (fast switching)
• High load: 50 processes (slower switching)
• Voluntary switch: process explicitly yields
• Involuntary switch: timer preemption