Performance Numbers of MVAPICH2 on Nehalem Architecture (10/29/09)

• 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 8x PCI Express interfaces and are equipped with InfiniPath-QLE7280 HCAs with PCI Express interfaces. A 24-port DDR switch was used to connect the two nodes. The operating system used was RedHat Linux AS4. InfiniPath Software Release 2.1 was used to build MVAPICH2.

• MVAPICH2 currently delivers one-sided put latency of 8.41 microseconds , one-sided get latency of 12.44 microseconds for 4 bytes, one-sided put bandwidth up to 1655 Million Bytes/sec, one-sided get bandwidth up to 1256 Million Bytes/sec and bidirectional bandwidth upto 2126 Million Bytes/sec on the above testbed. (1 Mega Byte = 1,048,576 Bytes; 1 Million Byte = 1,000,000 Bytes)