With the rapid developments of cluster systems,the problem of I/O bottleneck becomes more and moresevere. A good file system is crucial to the whole systems. Throughput,which means the jobs done per unit time ,is animportant index of the systems' performance. In this paper,through testing,the authors find that the throughput ofPVFS(Parallel Virtual File Systems),which now is popular in the field of parallel processing,is abnormally low. Thispaper discusses the cause of this phenomenon and improves the throughput of PVFS drastically by eliminating thisbottleneck. The performance before and after this improvement has also been compared.
