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C&python文件读写效率

2014-03-14 16:16 375 查看
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
2real 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

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