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2008
IEEE

Gather-arrange-scatter: Node-level request reordering for parallel file systems on multi-core clusters

11 years 7 months ago
Gather-arrange-scatter: Node-level request reordering for parallel file systems on multi-core clusters
—Multiple processors or multi-core CPUs are now in common, and the number of processes running concurrently is increasing in a cluster. Each process issues contiguous I/O requests individually, but they can be interrupted by the requests of other processes if all the processes enter the I/O phase together. Then, I/O nodes handle these requests as non-contiguous. This increases the disk seek time, and causes performance degradation. To overcome this problem, a node-level request reordering architecture, called Gather-Arrange-Scatter (GAS) architecture, is proposed. In GAS, the I/O requests in the same node are gathered and buffered locally. Then, those are arranged and combined to reduce the I/O cost at I/O nodes, and finally they are scattered to the remote I/O nodes in parallel. A prototype is implemented and evaluated using the BTIO benchmark. This system reduces up to 84.3% of the lseek() calls and reduces up to 93.6% of the number of requests at I/O nodes. This results in up to ...
Kazuki Ohta, Hiroya Matsuba, Yutaka Ishikawa
Added 29 May 2010
Updated 29 May 2010
Type Conference
Year 2008
Where CLUSTER
Authors Kazuki Ohta, Hiroya Matsuba, Yutaka Ishikawa
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