Expert · Module 14 · Lesson 2 of 4

Profiling With perf and Reading Flame Graphs

Record with linux perf, read report output, build flame graphs, and turn hot stacks into layout and algorithm fixes.

ProAbout 10 minutes

By the end you can

Record CPU profiles with perf record and read perf report output
Build and read flame graphs to find hot stacks
Turn profile data into targeted layout or algorithm changes

Builds on Caches and False Sharing: Layout for Speed.

01 · A question first

The queue benchmark shows a 20 percent gap but the code looks balanced. One function burns cycles, one line misses cache, one stack appears in half the samples. Which commands reveal that stack, and how do you read the graph that proves it?

Make a guess before you read on.

02 · The idea

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What's inside

Start with the problem
How the idea works
A repeatable perf loop from record to flame
Why it is correct
What it costs
Pitfalls and variations
Where it is used