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Enabling and Exploiting Partition-Level Parallelism (PALP) in Phase Change Memories by Shihao Song; Anup Das; Onur Mutlu; Nagarajan Kandasamy is a Computer Science article available to read on EtoBox.

What is Enabling and Exploiting Partition-Level Parallelism (PALP) in Phase Change Memories about?

Phase-change memory (PCM) devices have multiple banks to serve memory requests in parallel . Unfortunately, if two requests go to the same bank , they have to be served one after another , leading to lower system performance . We observe that a modern PCM bank is implemented as a collection of partitions that operate mostly independently while sharing a few global peripheral structures, which include the sense amplifiers (to read) and the write drivers (to write). Based on this observation, we propose PALP , a new mechanism that enables partition-level parallelism within each PCM bank, and exploits such parallelism by using the memory controller’s access scheduling decisions. PALP consists of three new contributions. First , we introduce new PCM commands to enable parallelism in a bank’s partitions in order to resolve the read-write bank conflicts, with no changes needed to PCM logic or its interface. Second , we propose simple circuit modifications that introduce a new operating mode for the write drivers, in addition to their default mode of serving write requests. When configured in this new mode, the write drivers can resolve the read-read bank conflicts, working jointly with t

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Author

Shihao Song; Anup Das; Onur Mutlu; Nagarajan Kandasamy

Publisher

ACM

Published

2019

Language

EN

Field

Computer Science (Physical Sciences)