Use Intel VTune and AMD uProf for Advanced Analysis

When perf stat Is Not Enough

Intel VTune and AMD uProf add source-line mapping, memory access analysis, and microarchitecture-specific metrics like frontend stalls and port utilization. Kernel teams use them when perf events are multiplexed too aggressively or when you need cache-line conflict detail that generic counters miss.

Workflow Overview

Build with debug symbols (-g). Run the profiler in hotspot or memory-access mode. Drill from function to source line to assembly. Compare before/after optimization runs saved as separate sessions.

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• Install the microarchitecture-specific event pack for your CPU generation
• Profile realistic input sizes; tiny inputs mislead cache analysis
• Pair with flame graphs: VTune for line-level, perf for regression CI
• Document compiler flags in the report so results are reproducible

Working Through the Exercise

Keep the relevant documentation open while you implement. When your output disagrees with the reference, trace one failing case by hand before changing random lines.

• Trace first: walk one failing input step by step
• Read the manual: skim the official doc for the mechanism named in this task
• Compare baselines: save measurements from the prior step so speedups are honest

Why for this exercise

You will document a profiling plan using VTune or uProf on a sample binary and interpret a provided summary table. This exercise requires mapping one hotspot function to a concrete optimization hypothesis.