测时， 对比QueryPerformanceFrequency / QueryPerformanceCounter
STREAM: Sustainable Memory Bandwidth in High Performance Computers
http://www.cs.virginia.edu/stream/
http://www.cs.virginia.edu/stream/FTP/Code/stream.c
ignore temp files
unix 代码改成 win32
打开 omp，记录测时结果，
cpu: i870
mem: ddr3 1333M 双通道
double8字节，未开启omp， 7.7GB/s；  开启omp：6.9GB/s；
float4字节，同上；

disable openmp

elementByte elementCount  arraybuffer  3arraybuffer
8           10M           80M          240M

copy      scale        add        triad
7.7 GB/S  6.2 GB/S     6.9 GB/S   6.8 GB/S
21.2ms    25.9ms       35.6 ms    35.6 ms

---------------------------------------------

enable openmp

copy      scale        add        triad
6.9 GB/S  5.3 GB/S     5.9 GB/S   5.9 GB/S
25.6ms    30.3ms       44.1 ms    41.5 ms