Differences
This shows you the differences between two versions of the page.
— |
seminars:seminar_4_19_17 [2017/09/21 02:02] (current) |
||
---|---|---|---|
Line 1: | Line 1: | ||
+ | ====== LazyPIM: Efficient Support for Cache Coherence in Processing-in-Memory Architectures ====== | ||
+ | Wednesday April 19, 2017\\ | ||
+ | Location: CIC Panther Hollow Room\\ | ||
+ | Time: 4:30PM\\ | ||
+ | |||
+ | **Amirali Boroumand (CMU)**\\ | ||
+ | |||
+ | =====Abstract===== | ||
+ | Processing-in-memory (PIM) architectures have seen an increase | ||
+ | in popularity recently, as the high internal bandwidth | ||
+ | available within 3D-stacked memory provides greater incentive | ||
+ | to move some computation into the logic layer of the | ||
+ | memory. To maintain program correctness, the portions of | ||
+ | a program that are executed in memory must remain coherent | ||
+ | with the portions of the program that continue to execute within | ||
+ | the processor. Unfortunately, PIM architectures cannot use | ||
+ | traditional approaches to cache coherence due to the high offchip | ||
+ | traffic consumed by coherence messages, which, as we | ||
+ | illustrate in thiswork, can undo the benefits of PIM execution | ||
+ | for many data-intensive applications. | ||
+ | We propose LazyPIM, a new hardware cache coherence | ||
+ | mechanism designed specifically for PIM. Prior approaches | ||
+ | for coherence in PIM are ill-suited to applications that share a | ||
+ | large amount of data between the processor and the PIM logic. | ||
+ | LazyPIM uses a combination of speculative cache coherence | ||
+ | and compressed coherence signatures to greatly reduce the | ||
+ | overhead of keeping PIM coherent with the processor, even | ||
+ | when a large amount of sharing exists.We find that LazyPIM | ||
+ | improves average performance across a range of data-intensive | ||
+ | PIM applications by 19.6%, reduces off-chip traffic by 30.9%, | ||
+ | and reduces energy consumption by 18.0%, over the best prior | ||
+ | approaches to PIM coherence. | ||
+ | |||
+ | |||
+ | =====Bio===== | ||
+ | Amirali Boroumand is a PhD student advised by Onur Mutlu. His research is focused on Processing in Memory. | ||
+ | |||
+ | |||
+ | |||
+ | \\ | ||
+ | \\ | ||
+ | **[[seminars| Back to the seminar page]]** |