What is false sharing in a multiprocessor system and how does it affect performance?
What will be an ideal response?
False sharing is a phenomenon that occurs in multiprocessor systems. Data in a multiprocessor system may exist in one or more private caches (the local caches of individual processors) and the main memory. When a processor performs a write operation, its cached value of a variable has to be updated. This is done by making the cache line invalid. However, it is possible that that cache line may contain other data that is still fresh. Invalidating the line also removes good data from the cache. This is false sharing because that data is not really being shared – it just happened to be in the same cache line. 13.
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