公开(公告)号：US11442862B2

公开(公告)日：2022-09-13

申请号：US16850310

申请日：2020-04-16

Applicant: SAP SE

Inventor： Robert Schulze ,  Adrian Dragusanu ,  Anup Ghatage ,  Colin Florendo ,  Mihnea Andrei ,  Randall Hammon ,  Sarika Iyer ,  Simhachala Sasikanth Gottapu ,  Yanhong Wang

IPC: G06F12/08 ,  G06F12/0862 ,  G06F12/0882 ,  G06F16/24 ,  G06F16/22

Abstract: Disclosed herein are system, method, and computer program product embodiments for performing fair prefetching. An embodiment operates by splitting a data vector into a first subrange and a second subrange. The embodiment performs a first chance prefetch operation on the first subrange based on a fixed number of pages, thereby loading a set of pages of the first subrange into a main memory. The embodiment performs the first chance prefetch operation on the second subrange based on the fixed number of pages, thereby loading a first set of pages of the second subrange into the main memory. The embodiment performs a second chance prefetch operation on the second subrange based on the performing the first chance prefetch operation on the second subrange, thereby loading a second set of pages of the second subrange into the main memory. The embodiment then executes the query.