| 发明名称 | Tracking prefetcher accuracy and coverage | ||
| 摘要 | A method, an apparatus, and a non-transitory computer readable medium for tracking accuracy and coverage of a prefetcher in a processor are presented. A table is maintained and indexed by an address, wherein each entry in the table corresponds to one address. A number of demand requests that hit in the table on a prefetch, a total number of demand requests, and a number of prefetch requests are counted. The accuracy of the prefetcher is calculated by dividing the number of demand requests that hit in the table on a prefetch by the number of prefetch requests. The coverage of the prefetcher is calculated by dividing the number of demand requests that hit in the table on a prefetch by the total number of demand requests. The table and the counters are reset when a reset condition is reached. | ||
| 申请公布号 | US9058278(B2) | 申请公布日期 | 2015.06.16 |
| 申请号 | US201213720072 | 申请日期 | 2012.12.19 |
| 申请人 | Advanced Micro Devices, Inc. | 发明人 | Kalamatianos John;Keltcher Paul |
| 分类号 | G06F12/08 | 主分类号 | G06F12/08 |
| 代理机构 | Volpe and Koenig, P.C. | 代理人 | Volpe and Koenig, P.C. |
| 主权项 | 1. A method for tracking accuracy and coverage of a prefetcher in a processor, comprising: maintaining a table indexed by an address, wherein: each entry in the table corresponds to one address;the table includes one bit per entry; andthe entry is set to “1” when a prefetch has been issued to the corresponding address; counting a number of demand requests that hit in the table on a prefetch using a first counter; calculating the accuracy of the prefetcher by dividing the number of demand requests that hit in the table on a prefetch by a number of prefetch requests, the number of prefetch requests being stored in a second counter; calculating the coverage of the prefetcher by dividing the number of demand requests that hit in the table on a prefetch by a total number of demand requests, the total number of demand requests being stored in a third counter; and resetting the table and the counters when a reset condition is reached, wherein: the reset condition is reached when a number of entries in the table that are set to “1” divided by a total number of entries in the table exceeds a predetermined value; andthe reset condition is checked each time an entry in the table is set to “1”. | ||
| 地址 | Sunnyvale CA US | ||