Towards Rack-scale Computing Challenges and Opportunities
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1 Towards Rack-scale Computing Challenges and Opportunities Paolo Costa joint work with Raja Appuswamy, Hitesh Ballani, Sergey Legtchenko, Dushyanth Narayanan, Ant Rowstron
2 Hardware Evolution in Data Centers Goal Increase work done per dollar (CapEx + OpEx) Paolo Costa Towards Rack-scale Computing: Challenges and Opportunities 2
3 Hardware Evolution in Data Centers Scale out vs. scale up Many commodity servers rather than few expensive servers Paolo Costa Towards Rack-scale Computing: Challenges and Opportunities 3
4 Hardware Evolution in Data Centers Custom layout Remove unnecessary components (e.g., GPGPUs, USB ports) Paolo Costa Towards Rack-scale Computing: Challenges and Opportunities 4
5 Hardware Evolution in Data Centers Integrated fabrics Higher density and lower power consumption Paolo Costa Towards Rack-scale Computing: Challenges and Opportunities 5
6 Hardware Evolution in Data Centers System-on-Chip (SoC) CPU, IO controllers, NIC/fabric switch on the same die Paolo Costa Towards Rack-scale Computing: Challenges and Opportunities 6
7 Hardware Evolution in Data Centers Silicon Photonics High-bandwidth / low-latency interconnect (resource disaggregation) Paolo Costa Towards Rack-scale Computing: Challenges and Opportunities 7
8 Hardware Evolution in Data Centers rack unit (RU) 2 Ru 4-10 Ru Rack-scale Paolo Costa Towards Rack-scale Computing: Challenges and Opportunities 8
9 Hardware Evolution in Data Centers Rack-scale Computers The rack is the new unit of deployment in data centers Sweet spot between single-server and cluster deployments rack unit (RU) 2 Ru 4-10 Ru Rack-scale Paolo Costa Towards Rack-scale Computing: Challenges and Opportunities 9
10 Rack-scale Computer in 2020? Today s traditional rack 2020 Rack-scale Computer #Cores (#servers) ~100s (20-40) ~100,000s (1,000s) Memory ~1 TB ~100s TB Storage ~100 TB (flash + spinning disk) ~100s PB (NVM) Bandwidth / server 10 Gbps 1 Tbps Paolo Costa Towards Rack-scale Computing: Challenges and Opportunities 10
11 How far are we from rack-scale computing? Today s rack 2020 Rack-scale Computer 2014 Rack-scale Computer #Cores (#servers) ~100s (20-40) ~100,000s (1,000s) ~1,000s (100s-1000s) Memory ~1 TB ~100s TB ~10 TBs Storage ~100 TB (SSD/HDD) ~100s PB (NVM) ~10s PBs (SSD/HDD) Network 10 Gbps / server 1 Tbps / server ~10s -100s Gbps / server Paolo Costa Towards Rack-scale Computing: Challenges and Opportunities 11
12 How far are we from rack-scale computing? #Cores (#servers) Today s rack ~100s (20-40) 2020 Rack-scale Computer ~100,000s (1,000s) 2014 Rack-scale Computer ~1,000s (100s-1000s) Memory ~1 TB ~100s TB ~10 TBs Storage ~100 TB (SSD/HDD) Network 10 Gbps / server ~100s PB (NVM) 1 Tbps / server ~10s PBs (SSD/HDD) ~10s -100s Gbps / server Core count AMD SeaMicro SM cores (64 servers) in 10 RU 2,048 cores (256 servers) at rack scale HP Moonshot Redstone 1,152 cores (288 servers) in 4U 11,520 cores (3,200 servers) at rack scale Boston Viridis 192 cores (48 servers) in 2 RU 7,680 cores (1,920 servers) at rack scale Paolo Costa Towards Rack-scale Computing: Challenges and Opportunities 12
13 How far are we from rack-scale computing? #Cores (#servers) Today s rack ~100s (20-40) 2020 Rack-scale Computer ~100,000s (1,000s) 2014 Rack-scale Computer ~1,000s (100s-1000s) Memory ~1 TB ~100s TB ~10 TBs Storage ~100 TB (SSD/HDD) Network 10 Gbps / server ~100s PB (NVM) 1 Tbps / server ~1 PB (SSD/HDD) ~10s -100s Gbps / server Memory AMD SeaMicro SM15000-XE 2 TB RAM (32 GB/server) in 10 RU 8TB RAM at rack scale HP Moonshot Redstone 1.12 TB (4 GB/server) in 4U TB at rack scale Storage AMD SeaMicro FS-5084-L 336 TB storage in 5 RU 2.5 PB at rack scale Paolo Costa Towards Rack-scale Computing: Challenges and Opportunities 13
14 How far are we from rack-scale computing? #Cores (#servers) Today s rack ~100s (20-40) 2020 Rack-scale Computer ~100,000s (1,000s) 2014 Rack-scale Computer ~1,000s (100s-1000s) Memory ~1 TB ~100s TB ~10 TBs Storage ~100 TB (SSD/HDD) ~100s PB (NVM) ~1 PB (SSD/HDD) Network AMD SeaMicro SM15000-XE 1.28 Tbps fabric (20 Gbps / server) Mellanox ConnectX-3 Pro 2x 40-Gbps NICs Intel MXC Connector (expected Q3 14) Up to 32 fibers (25 Gbps / fiber) Up to 800 Gbps / server Network 10 Gbps / server 1 Tbps / server ~10s -100s Gbps / server Paolo Costa Towards Rack-scale Computing: Challenges and Opportunities 14
15 How far are we from rack-scale computing? #Cores (#servers) Today s rack ~100s (20-40) 2020 Rack-scale Computer ~100,000s (1,000s) 2014 Rack-scale Computer ~1,000s (100s-1000s) Memory ~1 TB ~100s TB ~10 TBs Storage ~100 TB (SSD/HDD) ~100s PB (NVM) ~1 PB (SSD/HDD) Not just quantity 3D stacking Cache-like performance for RAM? NVRAM Fast byte-addressable storage Silicon photonics Low latency (10s-100s ns at rack-scale) Network 10 Gbps / server 1 Tbps / server ~10s -100s Gbps / server Paolo Costa Towards Rack-scale Computing: Challenges and Opportunities 15
16 New Hardware, Old Software Paolo Costa Towards Rack-scale Computing: Challenges and Opportunities 16
17 New Hardware, Old Software MapReduce Paolo Costa Towards Rack-scale Computing: Challenges and Opportunities 17
18 New Hardware, Old Software MapReduce Paolo Costa Towards Rack-scale Computing: Challenges and Opportunities 18
19 New Hardware, Old Software MapReduce Paolo Costa Towards Rack-scale Computing: Challenges and Opportunities 19
20 New Hardware, Old Software Achieving many of the benefits of Rack-scale Computers requires adequate software support Great opportunity for system researchers to rethink the software stack and hw/sw co-design MapReduce Paolo Costa Towards Rack-scale Computing: Challenges and Opportunities 20
21 Research Questions: Architecture What s the best usage of the silicon area? Homogenous vs. heterogeneous cores General-purpose cores vs. accelerators e.g., FPGAs, neural accelerators (NPUs) On-chip vs. off-chip functionality Paolo Costa Towards Rack-scale Computing: Challenges and Opportunities 21
22 Research Questions: Networking What is the correct topology? Centralized vs. distributed switch Application-agnostic vs. application specific Where to put memory/storage servers? Converged fabric How to handle memory, storage, IP traffic? Inter-rack connectivity How to extend beyond rack-scale? o over-subscription and protocol bridging Paolo Costa Towards Rack-scale Computing: Challenges and Opportunities 22
23 Research Questions: Networking What is the correct topology? Centralized vs. distributed switch Application-agnostic vs. application specific Where to put memory/storage servers? Converged fabric How to handle memory, storage, IP traffic? Inter-rack connectivity How to extend beyond rack-scale? o over-subscription and protocol bridging Paolo Costa Towards Rack-scale Computing: Challenges and Opportunities 23
24 Research Questions: Networking What is the correct topology? Centralized vs. distributed switch Application-agnostic vs. application specific Where to put memory/storage servers? Converged fabric How to handle memory, storage, IP traffic? Inter-rack connectivity How to extend beyond rack-scale? o over-subscription and protocol bridging Paolo Costa Towards Rack-scale Computing: Challenges and Opportunities 24
25 Research Questions: Networking What is the correct topology? Centralized vs. distributed switch Application-agnostic vs. application specific Where to put memory/storage servers? Converged fabric How to handle memory, storage, IP traffic? Inter-rack connectivity How to extend beyond rack-scale? o over-subscription and protocol bridging Paolo Costa Towards Rack-scale Computing: Challenges and Opportunities 25
26 Research Questions: Networking What is the correct topology? Centralized vs. distributed switch Application-agnostic vs. application specific Where to put memory/storage servers? Converged fabric How to handle memory, storage, IP traffic? Inter-rack connectivity How to extend beyond rack-scale? o over-subscription and protocol bridging Paolo Costa Towards Rack-scale Computing: Challenges and Opportunities 26
27 Research Questions: Networking What is the correct topology? Centralized vs. distributed switch Application-agnostic vs. application specific Where to put memory/storage servers? Converged fabric How to handle memory, storage, IP traffic? Inter-rack connectivity How to extend beyond rack-scale? o over-subscription and protocol bridging Paolo Costa Towards Rack-scale Computing: Challenges and Opportunities 27
28 Research Questions: OS / Storage Rethink the cache-hierarchy High-performance (3D stacking) vs. high-capacity tier (NVRAM) What s the correct ratio? Are SSDs / HDDs to be used only for cold data? Impact on existing (and new!) applications? Cache-like RAM and byte-addressable fast storage How to schedule application tasks? Joint scheduling (CPU, memory, network, storage) Paolo Costa Towards Rack-scale Computing: Challenges and Opportunities 28
29 Research Questions: Distributed Systems RaSCs are different from many-core setups Separate failure domains, no cache coherency Rack-scale computers are distributed systems (albeit not traditional) How to handle remote resources? Consistency and fault-tolerance What are the right programming abstractions? Shared memory, message passing, MapReduce, Paolo Costa Towards Rack-scale Computing: Challenges and Opportunities 29
![Aggregation [NSDI 12] Network Abstractions [HPDC 13]](/docs-images/31/14908072/images/30-0.jpg "Paolo Costa Towards Rack-scale Computing: Challenges and")
30 Rack-scale MSR Cambridge CamCube Vision [WREN 09] Custom Routing [SIGCOMM 10] In-network Aggregation [NSDI 12] Network Abstractions [HPDC 13] Paolo Costa Towards Rack-scale Computing: Challenges and Opportunities 30
31 Rack-scale MSR Cambridge Programming abstractions Storage Rack-scale design Network Paolo Costa Towards Rack-scale Computing: Challenges and Opportunities 31
32 Rack-scale MSR Cambridge Programming abstractions Storage Rack-scale design Network FaRM [NSDI 14] RDMA-based distributed platform Transaction support Lock-free reads Support for object colocation Hardware alone is not enough Software stack customization is needed High performance 167 M key lookups (31 us latency) on a 20-server testbed Aleksandar Dragojević, Dushyanth Narayanan, Orion Hodson, Miguel Castro Paolo Costa Towards Rack-scale Computing: Challenges and Opportunities 32
33 Rack-scale MSR Cambridge Programming abstractions Storage Rack-scale design Network Pelican Rack-scale storage appliance for cold data Hardware and software co-design High storage density Low cost Low power consumption Fault tolerant Austin Donnelly, Richard Black, Sergey Legtchenko, Ant Rowstron, Dave Harper, Shobana Balakrishnan, Eric Peterson, Adam Glass Paolo Costa Towards Rack-scale Computing: Challenges and Opportunities 33
34 Rack-scale MSR Cambridge Programming abstractions Storage Network Rack-scale design RaSC-Net [HotCloud 14] How to design a network stack for Rack-scale computers? Routing and congestion control Support for: Multiple paths Low latency Consolidated workloads Paolo Costa, Hitesh Ballani, Dushyanth Narayan Paolo Costa Towards Rack-scale Computing: Challenges and Opportunities 34
35 Rack-scale MSR Cambridge Programming abstractions Storage Network Rack-scale design DRackAr How to master the design space? Topology, resources provisioning, Input: Hardware components Constraints (e.g., max power budget) Target workload Utility function Output: Rack configuration Sergey Legtchenko, Ant Rowstron Paolo Costa Towards Rack-scale Computing: Challenges and Opportunities 35
36 Summary Rack-scale computing: 1,000s of cores TBs of RAM and PBs of storage Intra-rack high bandwidth / low latency connectivity This can improve the performance of existing apps graph processing, machine learning jobs, in-memory DBs, but also enable new ones! Call to action Hardware has been changing a lot now it s up to us to change the software too! Paolo Costa Towards Rack-scale Computing: Challenges and Opportunities 36
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