Title: Network-aware cache coherence protocol enhancement

Abstract

A non-uniform memory access system includes several nodes that each have one or more processors, caches, local main memory, and a local bus that connects a node's processor(s) to its memory. The nodes are coupled to one another over a collection of point-to-point interconnects, thereby permitting processors in one node to access data stored in another node. Memory access time for remote memory takes longer than local memory because remote memory accesses have to travel across a communications network to arrive at the requesting processor. In some embodiments, inter-cache and main-memory-to-cache latencies are measured to determine whether it would be more efficient to satisfy memory access requests using cached copies stored in caches of owning nodes or from main memory of home nodes.

Inventors:

Roberts, David A.; Fatehi, Ehsan

Issue Date:

2019-09-03

Research Org.:

Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Org.:

USDOE

OSTI Identifier:

1576397

Patent Number(s):

10402327

Application Number:

15/358,318

Assignee:

Advanced Micro Devices, Inc. (Santa Clara, CA)

Patent Classifications (CPCs):

G - PHYSICS G06 - COMPUTING G06F - ELECTRIC DIGITAL DATA PROCESSING

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G - PHYSICS G06 - COMPUTING G06F - ELECTRIC DIGITAL DATA PROCESSING

G06F12/0815 - Cache consistency protocols
G06F12/0822 - {Copy directories
G06F12/0824 - {Distributed directories, e.g. linked lists of caches}
G06F12/0826 - {Limited pointers directories
G06F12/084 - with a shared cache
G06F13/1615 - {using a concurrent pipeline structrure}
G06F2212/1024 - Latency reduction
G06F2212/314 - In storage network, e.g. network attached cache
G06F2212/502 - using adaptive policy
G06F2212/621 - Coherency control relating to peripheral accessing, e.g. from DMA or I/O device

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DOE Contract Number:  

AC52-07NA27344; B608045

Resource Type:

Patent

Resource Relation:

Patent File Date: 2016 Nov 22

Country of Publication:

United States

Language:

English