C&python文件读写效率

不同缓冲区读写文件的效率比较

环境：CentOS6.3/ext3/

读取文件大小：100000000B

BUFSIZE	TIMECOST
1	real 0m38.909s  user 0m5.960s  sys 0m32.888s
2	real 0m20.015s  user 0m2.927s  sys 0m17.063s
4	real 0m11.065s user 0m1.551s sys 0m9.491s
8	real 0m5.160s user 0m0.766s sys 0m4.390s
16	real 0m2.670s user 0m0.360s sys 0m2.310s
32	real 0m1.306s user 0m0.181s sys 0m1.124s
64	real 0m0.656s user 0m0.094s sys 0m0.561s
128	real 0m0.367s user 0m0.042s sys 0m0.325s
256	real 0m0.180s user 0m0.026s sys 0m0.153s
512	real 0m0.093s user 0m0.013s sys 0m0.081s
1024	real 0m0.056s user 0m0.006s sys 0m0.049s
2048	real 0m0.035s user 0m0.002s sys 0m0.033s
4096	real 0m0.025s user 0m0.001s sys 0m0.023s
8192	real 0m0.022s user 0m0.002s sys 0m0.019s
16384	real 0m0.020s user 0m0.003s sys 0m0.016s

python读写效率比较

实现方式	timecost
raw_input	real 0m0.493s user 0m0.420s sys 0m0.066s
sys.stdin.read()	real 0m0.102s user 0m0.013s sys 0m0.089s
sys.stdin.readlines()	real 0m0.258s user 0m0.088s sys 0m0.148s