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    • 17. 发明授权
    • Balancing latency and throughput for shared resources
    • 平衡共享资源的延迟和吞吐量
    • US08239589B1
    • 2012-08-07
    • US12751957
    • 2010-03-31
    • Tate Andrew CertainRoland Paterson-JonesJames R. Hamilton
    • Tate Andrew CertainRoland Paterson-JonesJames R. Hamilton
    • G06F3/00G06F13/00G06F13/28
    • G06F13/1626G06F3/0611G06F3/0659G06F3/0673
    • Input and output (I/O) operations performed by a data storage device are managed dynamically to balance aspects such as throughput and latency. Sequential read and write requests are sent to a data storage device whereby the corresponding operations are performed without time delay due to extra disk revolutions. In order to minimize latency, particularly for read operations, random read and write requests are held in a queue upstream of an I/O controller of the data storage device until the buffer of the data storage device is empty. The queued requests can be reordered when a higher priority request is received, improving the overall latency for specific requests. An I/O scheduler of a data server is still able to use any appropriate algorithm to order I/O requests, such as by prioritizing reads over writes as long as the writes do not back up in the I/O queue beyond a certain threshold.
    • 由数据存储设备执行的输入和输出(I / O)操作被动态地管理以平衡诸如吞吐量和延迟的方面。 顺序读写请求被发送到数据存储设备,由此由于额外的磁盘转数,相应的操作没有时间延迟。 为了最小化延迟,特别是对于读取操作,随机读取和写入请求被保存在数据存储设备的I / O控制器上游的队列中,直到数据存储设备的缓冲器为空。 当接收到更高优先级的请求时,排队的请求可以重新排序,从而提高特定请求的总体延迟。 数据服务器的I / O调度器仍然能够使用任何适当的算法来排序I / O请求,例如通过对写入进行优先级排序,只要写入不在I / O队列中备份超过某个阈值 。