Memory Scalability Evaluation of the Next-Generation Intel Bensley Platform with InfiniBand
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1 Memory Scalability Evaluation of the Next-Generation Intel Bensley Platform with InfiniBand Matthew Koop, Wei Huang, Ahbinav Vishnu, Dhabaleswar K. Panda Network-Based Computing Laboratory Department of Computer Science & Engineering The Ohio State University
2 Introduction Computer systems have increased significantly in processing capability over the last few years in various ways Multi-core architectures are becoming more prevalent High-speed I/O interfaces, such as PCI-Express have enabled high-speed interconnects such as InfiniBand to deliver higher performance The area that has improved the least during this time is the memory controller
3 Traditional Memory Design Traditional memory controller design has limited the number of DIMMs per memory channel as signal rates have increased Due to high pin count (240) required for each channel, adding additional channels is costly End result is equal or lesser memory capacity in recent years
4 Fully-Buffered DIMMs (FB-DIMMs) Image courtesy of Intel Corporation FB-DIMM uses serial lanes with a buffer on each chip to eliminate this tradeoff Each channel requires only 69 pins Using the buffer allows larger numbers of DIMMs per channel as well as increased parallelism
5 Evaluation With multi-core systems coming, a scalable memory subsystem is increasingly important Our goal is to compare FB-DIMM against a traditional design and evaluate the scalability Evaluation Process Test memory subsystem on a single node Evaluate network-level performance with two InfiniBand Host Channel Adapters (HCAs)
6 Outline Introduction & Goals Memory Subsystem Evaluation Experimental testbed Latency and throughput Network results Conclusions and Future work
7 Evaluation Testbed Intel Bensley system Two 3.2 GHz dual-core Intel Xeon Dempsey processors FB-DIMM-based memory subsystem Intel Lindenhurst system Two 3.4 GHz Intel Xeon processors Traditional memory subsystem (2 channels) Both contain: 2 8x PCI-Express slots DDR2 533-based memory 2 dual-port Mellanox MT25208 InfiniBand HCAs
8 Bensley Memory Configurations Branch1 Branch0 Channel3 Channel2 Channel1 Channel0 Slot 3 Slot 2 Slot 1 Slot 0 Slot 3 Slot 2 Slot 1 Slot 0 Slot 3 Slot 2 Slot 1 Slot 0 Slot 3 Slot 2 Slot 1 Slot 0 Processor 0 Processor 1 The standard allows up to 6 channels with 8 DIMMs/channel for 192GB Our systems have 4 channels, each with 4 DIMM slots To fill 4 DIMM slots we have 3 combinations
9 Subsystem Evaluation Tool lmbench 3.0-a5: Open-source benchmark suite for evaluating system-level performance Latency Memory read latency Throughput Memory read benchmark Memory write benchmark Memory copy benchmark Aggregate performance is obtained by running multiple long-running processes and reporting the sum of averages
10 Bensley Memory Throughput 6000 Read Write Copy Aggregate Throughput (MB/sec) Aggregate Throughput (MB/sec) Aggregate Throughput (MB/sec) Number of Processes Number of Processes Number of Processes 1 Channel 2 Channels 4 Channels 1 Channel 2 Channels 4 Channels 1 Channel 2 Channels 4 Channels To study the impact of additional channels we evaluated using 1, 2, and 4 channels Throughput increases significantly from one to two channels in all operations
11 Access Latency Comparison 200 Unloaded Loaded Comparison when unloaded and loaded 180 Read Latency (ns) Bensley Lindenhurst 4GB 8GB 16GB 2GB 4GB Loaded is when a memory read throughput test is run in the background while the latency test is runnning From unloaded to loaded latency: Lindenhurst: 40% increase Bensley: 10% increase
12 Memory Throughput Comparison Read Write Copy Aggregate Throughput (MB/sec) Aggregate Throughput (MB/sec) Aggregate Throughput (MB/sec) Number of Processes Number of Processes Number of Processes Bensley 4GB Bensley 8GB Bensley 16GB Lindenhurst 2GB Lindenhurst 4GB Bensley 4GB Bensley 8GB Bensley 16GB Lindenhurst 2GB Lindenhurst 4GB Bensley 4GB Bensley 8GB Bensley 16GB Lindenhurst 2GB Lindenhurst 4GB Comparison of Lindenhurst and Bensley platforms with increasing memory size Performance increases with two concurrent read or write operations on the Bensley platform
13 Outline Introduction & Goals Memory Subsystem Evaluation Experimental testbed Latency and throughput Network results Conclusions and Future work
14 OSU MPI over InfiniBand Open Source High Performance Implementations MPI-1 (MVAPICH) MPI-2 (MVAPICH2) Has enabled a large number of production IB clusters all over the world to take advantage of InfiniBand Largest being Sandia Thunderbird Cluster (4512 nodes with 9024 processors) Have been directly downloaded and used by more than 395 organizations worldwide (in 30 countries) Time tested and stable code base with novel features Available in software stack distributions of many vendors Available in the OpenFabrics(OpenIB) Gen2 stack and OFED More details at
15 Experimental Setup Round Robin Process Binding P2 P3 P0 P1 HCA 0 HCA 1 HCA 0 HCA 1 P0 P1 P2 P3 P2 P3 P0 P1 HCA 0 HCA 1 HCA 0 HCA 1 P0 P1 P2 P3 Evaluation is with two InfiniBand DDR HCAs, which uses the multi-rail feature of MVAPICH Results with one process use both rails in a round-robin pattern 2 and 4 process pair results are done using a process binding assignment
16 Uni-Directional Bandwidth 3000 Bensley: 1 Process Throughput (MB/sec) K 2K 4K 8K 16K 32K Message Size (bytes) 64K 128K 256K 512K 1M Bensley: 2 Processes Bensley: 4 Processes Lindenhurst: 1 Process Lindenhurst: 2 Processes Comparison of Lindenhurst and Bensley with dual DDR HCAs Due to higher memory copy bandwidth, Bensley signficantly outperforms Lindenhurst for the medium-sized messages
17 Bi-Directional Bandwidth Throughput (MB/sec) At 1K improvement: K 2K 4K 8K 16K 32K 64K 128K Message Size (bytes) Lindenhurst: 1 to 2 processes:15% Bensley: 1 to 2 processes: 75%, 2 to 4: 45% 256K 512K 1M Bensley: 1 Process Bensley: 2 Processes Bensley: 4 Processes Lindenhurst peak bi-directional bandwidth is only 100 MB/sec greater than uni-directional Lindenhurst: 1 Process Lindenhurst: 2 Processes
18 Messaging Rate Throughput (millions messages/sec) Bensley: 1 Process Bensley: 2 Processes Bensley: 4 Processes Lindenhurst: 1 Process Lindenhurst: 2 Processes K 2K 4K 8K Message Size (bytes) 16K 32K 64K 128K 256K For very small messages, both show similar performance At 512 bytes: Lindenhurst 2 process case is only 52% higher than 1 process, Bensley still shows 100% improvement
19 Outline Introduction & Goals Memory Subsystem Evaluation Experimental testbed Latency and throughput Network results Conclusions and Future work
20 Conclusions and Future Work Performed detailed analysis of the memory subsystem scalability of Bensley and Lindenhurst Bensley shows significant advantage in scalable throughput and capacity in all measures tested Future work: Profile real-world applications on a larger cluster and observe the effects of contention in multi-core architectures Expand evaluation to include NUMA-based architectures
21 Acknowledgements Our research is supported by the following organizations Current Funding support by Current Equipment support by 21
22 Web Pointers {koop, huanwei, vishnu, MVAPICH Web Page 22
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