Analysis of I/O performance of client caching in parallel file system

The design and implementation of client caching in LCTS-PFS was introduced, and the performance results were present. In the end, the influence on system I/O performance of client caching is concluded. I/O response time is one of the most important criterions of Parallel File System. Based on the Parallel File System queuing model with multi-client accessing and client-caching, the analysis of the influence on I/O response time of client caching was presented by changing the cache hit rate, the cache size and the file size. The conclusions are as follows: First, the higher the cache hit rate, the smaller the I/O response time, and the curves of the I/O response time with and without client caching has a point of intersection. The most important thing is that before the two curves intersect, the I/O response time without client caching is less than that with client caching; But after the two curves intersect, the phenomena is totally opposite. Second, the bigger the cache size, the longer the I/O response time with the cache hit rate remaining the same. Third, the bigger the file size, the smaller the improvement on the I/O response time by client caching if the client require produce rate remains the same. And the bigger the file size, the bigger the improvement on the I/O response time by client caching when the client require produce rate changes and the cache hit rate remains the same. The performance result turns out to be consistent with the analysis result.