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Performance Analysis and Evaluation of PCIe 2.0 and Quad-Data Rate InfiniBand

Performance Analysis and Evaluation of PCIe 2.0 and Quad-Data Rate InfiniBand,10.1109/HOTI.2008.26,Matthew J. Koop,Wei Huang,Karthik Gopalakrishnan,Dh

Performance Analysis and Evaluation of PCIe 2.0 and Quad-Data Rate InfiniBand   (Citations: 10)
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Abstract High-performance systems are undergoing,a major shift as commodity,multi-core systems become,increas- ingly prevalent. As the number,of processes per com- pute node increase, the other parts of the system must also scale appropriately to maintain a balanced,sys- tem. In the area of high-performance computing, one very important element of the overall system is the net- work interconnect that connects compute,nodes in the system. InfiniBand is a popular interconnect for high- performance clusters. Unfortunately, due to limited bandwidth of the PCI-Express fabric, InfiniBand perfor- mance has remained limited. PCI-Express (PCIe) 2.0 has recently become,available and has doubled the transfer rates available. This ad- ditional I/O bandwidth,balances the system and makes higher data rates for external interconnects such as In- finiBand feasible. As a result, InfiniBand Quad-Data Rate (QDR) mode has become,available on the newest Mellanox InfiniBand Host Channel Adapter (HCA) with a 40 Gb/sec signaling rate. In this paper we perform an in-depth performance,analysis of PCIe 2.0 and the effect of increased InfiniBand signaling rates. We show that even using the Double Data Rate (DDR) interface, PCIe 2.0 enables a 25% improvement,in NAS Parallel Bench- mark IS performance. Furthermore, we show that when using QDR on PCIe 2.0, network loopback can outper- form a shared memory,message passing implementation. We show that increased interconnection bandwidth,sig-
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