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Optically connected memory for disaggregated data centers
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DOI：10.1016/j.jpdc.2022.01.013.png)
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Abstract
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Recent advances in integrated photonics enable the implementation of reconfigurable, high-bandwidth, and low energy-per-bit interconnects in next-generation data centers. We propose and evaluate an Optically Connected Memory (OCM) architecture that disaggregates the main memory from the computation nodes in data centers. OCM is based on micro-ring resonators (MRRs), and it does not require any modification to the DRAM memory modules. We calculate energy consumption from real photonic devices and integrate them into a system simulator to evaluate performance. Our results show that (1) OCM is capable of interconnecting four DDR4 memory channels to a computing node using two fibers with 1.02 pJ energy-per-bit consumption and (2) OCM performs up to 5.5 x faster than a disaggregated memory with 40G PCIe NIC connectors to computing nodes. (c) 2022 Elsevier Inc. All rights reserved.
Keywords:
Disaggregated memory
Photonics
Data-centers
DRAM
Memory systems
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