The ADvanced Systems Laboratory (ADSL)
Publication abstract
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Mjolnir: Collecting Trash in a Demanding New World
Zev Weiss,
Sriram Subramanian, Swaminathan Sundararaman, Vinay Sridhar, Nisha Talagala,
Andrea C. Arpaci-Dusseau,
Remzi H. Arpaci-Dusseau
Department of Computer Sciences,
University of Wisconsin-Madison
SanDisk, Inc.
Abstract:
As flash devices become ubiquitous in data centers and cost per gigabyte drops,
flash systems need to provide data services similar to those of traditional
storage. We present Mjolnir, a powerful and scalable engine that addresses
the core problems that make efficient flash based data services challenging:
multi-reference management and garbage collection. Additionally, by providing
powerful primitives for address remapping, Mjolnir enables redesign of the I/O
stack for greater efficiency and performance with flash. Mjolnir uses
techniques from language runtimes for reference management and garbage
collection; we show via prototype and experimental evaluation that this design
can deliver predictable performance even with varied user workloads across a
range of capacity and reference-count scales.
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