How to understand the performance of C++

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Per.5: don't assume that low-level code must be faster than high-level code.

Reason (reason)

Low-level code sometimes inhibits optimizations. Optimizers sometimes do marvels with high-level code.

Low-level code sometimes hinders optimization. Sometimes the optimizer makes amazing optimizations for high-level code.

Per.6: Don't make claims about performance without measurements

Per.6: don't just complain about performance problems qualitatively

Reason (reason)

The field of performance is full of myths and false legends. Advanced hardware and optimizers cannot resist ignorant assumptions; even experts are often surprised.

Note (Note)

Getting good performance measurements can be hard and require specialized tools.

Getting good performance metrics is difficult and requires specific tools.

Note (Note)

Some simple benchmark programs or standard libraries that use Unix time can help dispel most obvious myths. If you cannot accurately measure the entire system, you should at least measure important operations and algorithms. The analyzer can tell you which part of the system is performance-sensitive. Usually, the result will surprise you.

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