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DTSTAMP:20210402T160558Z
LOCATION:Track 5
DTSTART;TZID=America/New_York:20201111T130000
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UID:submissions.supercomputing.org_SC20_sess195_ws_mchpc101@linklings.com
SUMMARY:Architecting Heterogeneous Memory Systems with DRAM Technology Onl
 y: A Case Study on Relational Database
DESCRIPTION:Workshop\n\nArchitecting Heterogeneous Memory Systems with DRA
 M Technology Only: A Case Study on Relational Database\n\nQiao, Chen, Hao,
  Zhang, Xie...\n\nThis paper advocates a DRAM-only design strategy to redu
 ce the computing system memory cost and demonstrates its potential in the 
 context of relational database. In particular, we envision a low-cost hete
 rogeneous DRAM fabric consisting of convenient but expensive byte-addressa
 ble DRAM and large-capacity low-cost DRAM with coarse access granularity (
 e.g., 1K-byte). Regardless of specific memory technology, one can reduce t
 he manufacturing cost by sacrificing the memory raw reliability, and apply
  error correction code~(ECC) to restore the data storage integrity. The ef
 ficiency of ECC significantly improves as the codeword length increases, w
 hich enlarges the memory access granularity. This leads to a fundamental t
 rade-off between memory cost and access granularity. Following this princi
 ple, Intel 3DXP-based Optane memory DIMM internally operates with a 256-by
 te ECC codeword length (hence 256-byte access granularity), and Hynix rece
 ntly demonstrated low-cost DRAM DIMM with a 64-byte access granularity. Th
 is paper presents a design approach that enables relational database to ta
 ke full advantage of the envisioned low-cost heterogeneous DRAM fabric to 
 improve performance with only minimal database source code modification. U
 sing MySQL as a test vehicle, we implemented a prototyping system, on whic
 h we have demonstrated its effectiveness under TPC-C and Sysbench OLTP ben
 chmarks.\n\nRegistration Category: Workshop Reg Pass
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