At present, there are many effective ways to achieve high performance in cluster system storage management, including server-end disk, server-end caching, local caching and cooperative caching. The cooperative caching...At present, there are many effective ways to achieve high performance in cluster system storage management, including server-end disk, server-end caching, local caching and cooperative caching. The cooperative caching mechanism shares caches among different clients so as to avoid expensive disk access costs and to improve overall throughput of cluster system. In this paper, a Single Copy Cooperative Cache model is proposed together with block lookup algorithm, block replacement algorithm and the consistency algorithm based on the model. Meanwhile, the prototype system of the model is implemented in PVFS file system. Finally, the performance of this system is tested in InfiniBand Framework, the result of which shows that in contrast to the original PVFS system, read performance of PVFS file system is improved by about two times, while write performance is reduced by nearly ten percent.展开更多
In this paper, we propose a strategy of maintaining cache consistency in wireless mobile environments, which adds a validation server （VS） into the GPRS network, utilizes the location information of mobile terminal ...In this paper, we propose a strategy of maintaining cache consistency in wireless mobile environments, which adds a validation server （VS） into the GPRS network, utilizes the location information of mobile terminal in SGSN located at GPRS backbone, just sends invalidation information to mobile terminal which is online in accordance with the cached data, and reduces the information amount in asynchronous transmission. This strategy enables mobile terminal to access cached data with very little computing amount, little delay and arbitrary disconnection intervals, and excels the synchronous IR and asynchronous slate （AS） in the total performances.展开更多
Directory protocols are widely adopted to maintain cache coherence of distributed shared memory multiprocessors. Although scalable to a certain extent, directory protocols are complex enough to prevent it from being u...Directory protocols are widely adopted to maintain cache coherence of distributed shared memory multiprocessors. Although scalable to a certain extent, directory protocols are complex enough to prevent it from being used in very large scale multiprocessors with tens of thousands of nodes. This paper proposes a lock-based cache coherence protocol for scope conyistency. It does not rely on directory information to maintain cache coherence. Instead, cache coherence is mailltained through requiring the releasing processor of a lock to store all write-notices generated in the associated critical section to the lock and the acquiring processor invalidates or updates its locally cached data copies according to the write notices of the lock. To evaluate the performance of the lock-based cache coherence protocol, a software DSM system named JIAJIA is built on network of workstations. Besides the lockbased cache coherence protocol, JIAJIA also characterizes itself with its shared memory organization scheme which combines the physical memories of multiple workstations to form a large shared space. Performance measurements with SPLASH2 program suite and NAS benchmarks indicate that, compared to recent SVM systems such as CVM, higher speedup is achieved by JIAJIA.Besides, JIAJIA can solve large scale problems that cannot be solved by other SVM systems due to memory size limitation.展开更多
基金This work was supported by the National High Technology Development Program of China under Grant(No.2004AA111110,No.2006AA01A109)
文摘At present, there are many effective ways to achieve high performance in cluster system storage management, including server-end disk, server-end caching, local caching and cooperative caching. The cooperative caching mechanism shares caches among different clients so as to avoid expensive disk access costs and to improve overall throughput of cluster system. In this paper, a Single Copy Cooperative Cache model is proposed together with block lookup algorithm, block replacement algorithm and the consistency algorithm based on the model. Meanwhile, the prototype system of the model is implemented in PVFS file system. Finally, the performance of this system is tested in InfiniBand Framework, the result of which shows that in contrast to the original PVFS system, read performance of PVFS file system is improved by about two times, while write performance is reduced by nearly ten percent.
文摘In this paper, we propose a strategy of maintaining cache consistency in wireless mobile environments, which adds a validation server （VS） into the GPRS network, utilizes the location information of mobile terminal in SGSN located at GPRS backbone, just sends invalidation information to mobile terminal which is online in accordance with the cached data, and reduces the information amount in asynchronous transmission. This strategy enables mobile terminal to access cached data with very little computing amount, little delay and arbitrary disconnection intervals, and excels the synchronous IR and asynchronous slate （AS） in the total performances.
文摘Directory protocols are widely adopted to maintain cache coherence of distributed shared memory multiprocessors. Although scalable to a certain extent, directory protocols are complex enough to prevent it from being used in very large scale multiprocessors with tens of thousands of nodes. This paper proposes a lock-based cache coherence protocol for scope conyistency. It does not rely on directory information to maintain cache coherence. Instead, cache coherence is mailltained through requiring the releasing processor of a lock to store all write-notices generated in the associated critical section to the lock and the acquiring processor invalidates or updates its locally cached data copies according to the write notices of the lock. To evaluate the performance of the lock-based cache coherence protocol, a software DSM system named JIAJIA is built on network of workstations. Besides the lockbased cache coherence protocol, JIAJIA also characterizes itself with its shared memory organization scheme which combines the physical memories of multiple workstations to form a large shared space. Performance measurements with SPLASH2 program suite and NAS benchmarks indicate that, compared to recent SVM systems such as CVM, higher speedup is achieved by JIAJIA.Besides, JIAJIA can solve large scale problems that cannot be solved by other SVM systems due to memory size limitation.
