C++ - Debugging & Performance

Overview

Estimated time: 60–80 minutes

Profile before you optimize. Learn basic profiling tools, measurement techniques, and safe optimization guidelines.

Learning Objectives

• Use profilers (perf, Instruments, VTune) and timers.
• Apply optimization flags and understand their impact.

Measurement

#include 
#include 
using namespace std::chrono;
auto t0 = steady_clock::now();
// work
auto t1 = steady_clock::now();
std::cout << duration_cast(t1-t0).count() << "ms\n";

Common Pitfalls

• Micro-optimizing without profiling; premature optimization.
• Ignoring undefined behavior; compilers may optimize in unexpected ways.