[book][optimization][C++] Optimized C++ - Kurt Guntheroth

Measure Performance

• Performance must be measured.
• Make testable predictions, jot down the predictions.
• Make a record of code changes.
• If each experiment run is documented, it can quickly be repeated.
• A measurement must be both true and precise to be accurate.
• Resolution is not accuracy.
• Do not use only intuition, but with methodology.
• in C++, count the number of memory reads/writes performed by the statement shows how expensive the statement is.