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2011
IEEE

Increasing the effectiveness of directory caches by deactivating coherence for private memory blocks

7 years 10 months ago
Increasing the effectiveness of directory caches by deactivating coherence for private memory blocks
To meet the demand for more powerful high-performance shared-memory servers, multiprocessor systems must incorporate efficient and scalable cache coherence protocols, such as those based on directory caches. However, the limited directory cache size of the increasingly larger systems may cause frequent evictions of directory entries and, consequently, invalidations of cached blocks, which severely degrades system performance. A significant percentage of the referred memory blocks are only accessed by one processor (even in parallel applications) and, therefore, do not require coherence maintenance. Taking advantage of techniques that dynamically identify those private blocks, we propose to deactivate the coherence protocol for them and to treat them as uniprocessor systems do. The protocol deactivation allows directory caches to omit the tracking of an appreciable quantity of blocks, which reduces their load and increases their effective size. Since the operating system collaborates...
Blas Cuesta, Alberto Ros, María Engracia G&
Added 21 Aug 2011
Updated 21 Aug 2011
Type Journal
Year 2011
Where ISCA
Authors Blas Cuesta, Alberto Ros, María Engracia Gómez, Antonio Robles, José Duato
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