Web Reference: Jan 16, 2026 · False Sharing: When multiple threads access different variables that accidentally reside in the same cache line. The threads don’t share data, but the CPU treats the entire cache line as shared. This leads to unnecessary cache invalidations and performance loss— even though the program is correct. False sharing happens when two CPU cores modify different variables that happen to live on the same cache line. The hardware treats the entire line as contested and forces expensive synchronization on every write, even though the cores are logically working on independent data. False sharingis a performance problem in multi-threaded applications that occurs when multiple threads modify variables located close together in memory(typically on the same CPU cache line),...
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