Last Updated
：2025/12/04
false sharing
Noun
uncountable
Japanese Meaning
キャッシュライン単位でのデータが意図せず共有され、各プロセッサやスレッドが別々の変数を更新する際に、キャッシュ全体の再読み込みが発生し、不必要なオーバーヘッドによって性能が低下する現象。 / マルチプロセッサ環境で、複数のスレッドが同一キャッシュライン上の異なる変数を操作するために、キャッシュコヒーレンシが頻発し、結果としてアプリケーションの実行速度が落ちる現象。
Quizzes for review
(computing theory) A performance-degrading usage pattern where the size of units in a cache means that the system may reload entire units even when it is not necessary.
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false sharing
During profiling, we discovered that false sharing between worker threads was degrading throughput due to unnecessary cache-line reloads.
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During profiling, we discovered that false sharing between worker threads was degrading throughput due to unnecessary cache-line reloads.
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