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Cache pollution
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<p>Cache pollution describes situations where an executing <a href="/facts/Computer_program/e38jH9N9">computer program</a> loads data into <a href="/facts/CPU_cache/x8BYFcdv">CPU cache</a> unnecessarily, thus causing other useful data to be evicted from the cache into lower levels of the <a href="/facts/Memory_hierarchy/ttwjvRyd">memory hierarchy</a>, degrading performance. For example, in a <a href="/facts/Multi-core_processor/ABNb65hQ">multi-core processor</a>, one core may replace the blocks fetched by other cores into shared cache, or <a href="/facts/Cache_prefetching/cuCGl0Vm">prefetched</a> blocks may replace demand-fetched blocks from the cache. </p>