Performance Numbers of MVAPICH2 on em64t Platform (11/06/08)

• Experimental Testbed: Each node of our testbed has eight cores (2.40 GHz dual quad-core) and 12 GB main memory. The CPUs based on Nehalem architecture and run in 64 bit mode. The nodes support 16x PCI Express Gen2 interfaces and are equipped with Mellanox ConnectX QDR HCAs with PCI Express interfaces. The nodes are connected using a 36 port Mellanox QDR InfiniBand switch. The operating system used was RedHat Enterprise Linux Server 5.

• MVAPICH2 currently delivers one-way latency of2.18 microseconds for 4 bytes, unidirectional bandwidth upto 3028 Million Bytes/sec and bidirectional bandwidth upto 5691 Million Bytes/sec on the above testbed. (1 Mega Byte = 1,048,576 Bytes; 1 Million Byte = 1,000,000 Bytes)