?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=A+software-defined+architecture+and+prototype+for+disaggregated+memory+rack+scale+systems&rft.creator=Syrivelis%2C+D&rft.creator=Reale%2C+A&rft.creator=Katrinis%2C+K&rft.creator=Syrigos%2C+I&rft.creator=Bielski%2C+M&rft.creator=Theodoropoulos%2C+D&rft.creator=Pnevmatikatos%2C+DN&rft.creator=Zervas%2C+G&rft.description=Disaggregation+and+rack-scale+systems+have+the+potential+of+drastically+increasing+TCO+and+utilization+of+cloud+datacenters%2C+while+maintaining+performance.+In+this+paper%2C+we+present+a+novel+rack-scale+system+architecture+featuring+software-defined+remote+memory+disaggregation.+Our+hardware+design+and+operating+system+extensions+enable+unmodified+applications+to+dynamically+attach+to+memory+segments+residing+on+physically+remote+memory+pools+and+use+such+remote+segments+in+a+byte-addressable+manner%2C+as+if+they+were+local+to+the+application.+Our+system+features+also+a+control+plane+that+automates+software-defined+dynamic+matching+of+compute+to+memory+resources%2C+as+driven+by+datacenter+workload+needs.+We+prototyped+our+system+on+the+commercially+available+Zynq+Ultrascale%2B+MPSoC+platform.+To+our+knowledge%2C+this+is+the+first+time+a+software-defined+disaggregated+system+has+been+prototyped+on+commercial+hardware+and+evaluated+through+industry+standard+software+benchmarks.+Our+initial+results+-+using+benchmarks+that+are+artificially+highly+adversarial+in+terms+of+memory+bandwidth+-+show+that+disaggregated+memory+access+exhibits+a+round-trip+latency+of+only+134+clock+cycles%3B+and+a+throughput+penalty+of+as+low+as+55%25%2C+relative+to+locally-attached+memory.+We+also+discuss+estimations+as+to+how+our+findings+may+translate+to+applications+with+pragmatically+milder+memory+aggressiveness+levels%2C+as+well+as+innovation+avenues+across+the+stack+opened+up+by+our+work.&rft.subject=disaggregation%2C+extended+memory%2C+serverless%0D%0Acomputing%2C+pooled+computing%2C+rack+scale+systems%2C+rack+scale+datacenters%2C+software-defined+systems%2C+cloud+datacenters%2C+internetscale+computer&rft.publisher=IEEE&rft.date=2018-04-23&rft.type=Proceedings+paper&rft.language=eng&rft.source=+++++In%3A++2017+International+Conference+on+Embedded+Computer+Systems%3A+Architectures%2C+Modeling%2C+and+Simulation+(SAMOS).++(pp.+pp.+300-307).++IEEE%3A+Pythagorion%2C+Greece.+(2018)+++++&rft.format=text&rft.identifier=https%3A%2F%2Fdiscovery.ucl.ac.uk%2Fid%2Feprint%2F10069632%2F1%2FIBM_samos2017.pdf&rft.identifier=https%3A%2F%2Fdiscovery.ucl.ac.uk%2Fid%2Feprint%2F10069632%2F&rft.rights=open