公开(公告)号：US08443151B2

公开(公告)日：2013-05-14

申请号：US12614619

申请日：2009-11-09

申请人： Puqi P. Tang ,  Hemant G. Rotithor ,  Ryan L. Carlson ,  Nagi Aboulenein

发明人： Puqi P. Tang ,  Hemant G. Rotithor ,  Ryan L. Carlson ,  Nagi Aboulenein

IPC分类号： G06F12/00 ,  G06F12/08

CPC分类号： G06F12/0862 ,  G06F15/8069 ,  G06F2212/502 ,  Y02D10/13

摘要： An apparatus and method is described herein for optimization to prefetch throttling, which potentially enhances performance, reduces power consumption, and maintains positive gain for workloads that benefit from prefetching. More specifically, the optimizations described herein allow for bandwidth congestion and prefetch accuracy to be taken into account as feedbacks for throttling at the source of prefetch generation. As a result, when there is low congestion, full prefetch generation is allowed, even if the prefetch is inaccurate, since there is available bandwidth. However, when congestion is high, the determination of throttling falls to prefetch accuracy. If accuracy is high—miss rate is low—then less throttling is needed, because the prefetches are being utilized—performance is being enhanced. Yet, if prefetch accuracy is low—miss rate is high—then more prefetch throttling is needed to save power, because the prefetch are not being utilized—performance is not being enhanced by the large number of prefetches.

摘要翻译： 本文描述了用于优化预取节流的装置和方法，其潜在地增强了性能，降低了功耗，并为从预取中受益的工作负载保持了正增益。 更具体地说，这里描述的优化允许考虑带宽拥塞和预取精度作为用于在预取生成源处节流的反馈。 结果，当拥塞低时，即使预取不准确，由于存在可用带宽，因此允许完全预取生成。 然而，当拥塞较高时，节流的确定下降到预取精度。 如果精度高，错失率低，则需要较少的节流，因为预取已被利用 - 性能正在提高。 然而，如果预取精度低错过率高，则需要更多的预取节流来节省功率，因为​​预取不被利用 - 性能并没有被大量预取提高。