Agradecimentos: This work is supported by the LPS Advanced Computing Systems (ACS) Research Program contract HD TAT DO 7 (HT 15-1158)), the Department of Energy (DOE) Small Business Innovation Research (SBIR) ASCR Program (contract DE-SC0017182), the São Paulo Research Foundation (FAPESP) (fellowships 2013/08293-7 and 2014/01642-9), CAPES (fellowships 2013/08293-7 and 88882.329108/2019-01), CNPq (fellowships 438445/2018-0, 309794/2017-0 and 142016/2020-9), and CONCYTEC-PROCIENCIA under the call E041-01 [contract number 015-2018-FONDECYT/BM] Ver menos

Abstract: 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× faster than a disaggregated memory with 40G PCIe NIC connectors to computing nodes Ver menos