Cache, prefetch, and branches: hardware that affects software
An introduction to cache, prefetch, false sharing, and branches shows why understanding hardware behavior can help engineers investigate software performance.
Cache, prefetch, false sharing, and branches are hardware concepts relevant to programmers. Understanding them helps frame hypotheses about how hardware behavior can affect software performance.
Start by identifying what you want to study: cache and prefetch concern data access; false sharing and branches are other factors that can influence execution. Use these categories to guide your reading without assuming that any one of them explains a specific problem.
When investigating a program, compare measurements under consistent conditions and change one thing at a time. Record what changed and the observed result; a hardware hypothesis does not replace evidence gathered on the system itself.
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