NDLI: Hosting an object heap on manycore hardware: an exploration

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Hosting an object heap on manycore hardware: an exploration

Hosting an object heap on manycore hardware: an exploration

Content Provider	ACM Digital Library
Author	Ungar, David Adams, Sam S.
Abstract	In order to construct a test-bed for investigating new programming paradigms for future "manycore" systems (i.e. those with at least a thousand cores), we are building a Smalltalk virtual machine that attempts to efficiently use a collection of 56-on-chip caches of 64KB each to host a multi-megabyte object heap. In addition to the cost of inter-core communication, two hardware characteristics influenced our design: the absence of hardware-provided cache-coherence, and the inability to move a single object from one core's cache to another's without changing its address. Our design relies on an object table, and the exploitation of a user-managed caching regime for read-mostly objects. At almost every stage of our process, we obtained measurements in order to guide the evolution of our system. The architecture and performance characteristics of a manycore platform confound old intuitions by deviating from both traditional multicore systems and from distributed systems. The implementor confronts a wide variety of design choices, such as when to share address space, when to share memory as opposed to sending a message, and how to eke out the most performance from a memory system that is far more tightly integrated than a distributed system yet far less centralized than in a several-core system. Our system is far from complete, let alone optimal, but our experiences have helped us develop new intuitions needed to rise to the manycore software challenge.
Starting Page	99
Ending Page	110
Page Count	12
File Format	PDF
ISBN	9781605587691
DOI	10.1145/1640134.1640149
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2009-10-26
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Smalltalk Object table Cache performance Object heap Virtual machine Squeak Manycore
Content Type	Text
Resource Type	Article

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