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An Efficient Cache Design for Solid-state Drives

Sharifi, Sina | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50031 (19)
  4. University: Sharif University of Technology
  5. Department: Computer Engineering
  6. Advisor(s): Sarbazi Azad, Hamid
  7. Abstract:
  8. The use of raed cache of hard disk or solid state drives has a magnificent effect on their performance, power consumption, and their endurance. However, one of the main problems of their read cache is its low hit ratio. Thus, the read cache must be used more efficiently. Based on previous studies, nearly all of the blocks which are brought to the read cache are zero-reuse or dead-on-arrival, which means that after the blocks enter to the read cache, they are not accessed until they are evicted. Thus, a large portion of the disk read cache is nearly unused because of these dead blocks. In this thesis, we will design a disk read cache which does not allow to the dead blocks to enter the cacheand replaces them with useful blocks and therefore, uses the read cache space more efficiently. As a result, the read cache is less polluted, its hit ratio will be increased, and finally the performance of disk subsystem will be improved. To investigate the performance of proposed scheme against previous mechanisms, we use FlashSim simulator. The simulation results show that the proposed scheme improves the geometric mean of read requests’ IOPS by 22% over the best replacement policy and also by 45% over the best previous prefetching scheme
  9. Keywords:
  10. Cache Memory ; Performance ; Solid State Disk Drive ; Hit Ratio ; Dead Block

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