两篇文章均转自：http://thomasgds.blog.163.com/blog/#m=0


Linux下各种主要文件系统的读写性能测试  


1、不用说，tmpfs是最快的，呵呵
2、ext2


写测试：


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CODE:


debian:/mnt/sda1# time dd if=/dev/zero of=test bs=1024 count=100K


102400+0 records in


102400+0 records out


104857600 bytes (105 MB) copied, 1.40192 seconds, 74.8 MB/s


real 0m1.414s


user 0m0.140s


sys 0m0.230s


读测试：


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CODE:


debian:/mnt/sda1# time cat test > /dev/null


real 0m2.084s


user 0m0.000s


sys 0m0.310s


3、ext3


（1）data=ordered


写测试：


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CODE:


debian:/mnt/sda1# time dd if=/dev/zero of=test bs=1024 count=100K


102400+0 records in


102400+0 records out


104857600 bytes (105 MB) copied, 1.04712 seconds, 100 MB/s


real 0m1.057s


user 0m0.090s


sys 0m0.580s


读测试：


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CODE:


debian:/mnt/sda1# time cat test > /dev/null


real 0m1.429s


user 0m0.020s


sys 0m0.290s


（2）data=writeback


写测试：


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CODE:


debian:/mnt/sda1# time dd if=/dev/zero of=test bs=1024 count=100K


102400+0 records in


102400+0 records out


104857600 bytes (105 MB) copied, 0.990267 seconds, 106 MB/s


real 0m1.004s


user 0m0.110s


sys 0m0.470s


读测试：


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CODE:


debian:/mnt/sda1# time cat test > /dev/null


real 0m1.339s


user 0m0.010s


sys 0m0.250s


（3）data=journal


写测试：


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CODE:


debian:/mnt/sda1# time dd if=/dev/zero of=test bs=1024 count=100K


102400+0 records in


102400+0 records out


104857600 bytes (105 MB) copied, 6.45851 seconds, 16.2 MB/s


real 0m6.470s


user 0m0.080s


sys 0m0.590s


读测试：


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CODE:


debian:/mnt/sda1# time cat test > /dev/null


real 0m1.665s


user 0m0.010s


sys 0m0.220s


4、ReiserFS


写测试：


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CODE:


debian:/mnt/sda1# time dd if=/dev/zero of=test bs=1024 count=100K


102400+0 records in


102400+0 records out


104857600 bytes (105 MB) copied, 1.13243 seconds, 92.6 MB/s


real 0m1.153s


user 0m0.040s


sys 0m0.620s


读测试：


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CODE:


debian:/mnt/sda1# time cat test > /dev/null


real 0m1.543s


user 0m0.000s


sys 0m0.240s


5、XFS


写测试：


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CODE:


debian:/mnt/sda1# time dd if=/dev/zero of=test bs=1024 count=100K


102400+0 records in


102400+0 records out


104857600 bytes (105 MB) copied, 1.76025 seconds, 59.6 MB/s


real 0m2.000s


user 0m0.060s


sys 0m0.470s


读测试：


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CODE:


debian:/mnt/sda1# time cat test > /dev/null


real 0m2.203s


user 0m0.010s


sys 0m0.270s


6、JFS


写测试：


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CODE:


debian:/mnt/sda1# time dd if=/dev/zero of=test bs=1024 count=100K


102400+0 records in


102400+0 records out


104857600 bytes (105 MB) copied, 0.581869 seconds, 180 MB/s


real 0m0.613s


user 0m0.140s


sys 0m0.250s


读测试：


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CODE:


debian:/mnt/sda1# time cat test > /dev/null


real 0m0.579s


user 0m0.010s


sys 0m0.350s


JFS文件系统还真快


ext3文件系统下，如果设置为data=journal,效果要打不少折扣。










实际系统中的Nand Flash速度测试结果  


2007-11-19 12:37:25|  分类： linux学习|字号 订阅


linux下测试文件系统读写速度方法是利用time命令，往flash中写入和读出固定大小的文件，然后进行统计所得，测试写入速度的命令是：time dd


if=/dev/zero of=ffmpeg bs=1024 count=100000， 测试读出速度的命令是：time cat ffmpeg > /dev/null。得到的时间log如下：
    real    0m 0.24s
    user    0m 0.01s
    sys     0m 0.21s
    用实际文件大小处于real的时间值，就可以获得读写速度。
    nand flash的写入速度：602.55KB/s
 /nand # time dd if=/dev/zero of=ffmpeg bs=1024 count=100000
 100000+0 records in
 100000+0 records out
 real    2m 45.96s
 user    0m 0.72s
 sys     2m 3.23s
   nand flash的读出速度：1114.45KB/s
 /nand # time cat ffmpeg > /dev/null
 real    1m 29.73s
 user    0m 0.01s
 sys     1m 7.06s