iozone

tarball installation:

wget http://www.iozone.org/src/current/iozone3_414.tar

tar xvf iozone3_414.tar && cd iozone3_414/src/current && make linux
(for x64 use linux-AMD64)

-a  #auto mode will test below matrix:

• record size from 4k to 16M
• file size from 64k to 512M

-g  #set maximum file size (in Kbytes) for auto mode (or #m or #g)

所以為了避免 linux 的 catch 機制，我們可以將要測試的檔案設定為記憶體的兩倍。

所以就是

iozone -a -g 8G (如果你的系統記憶體是 4G 的話)

其他模式的參數 -h 也可以看到，下面列有趣的....:

-s # file size in Kb
-i  # Test to run
         0=write/rewrite,
         1=read/re-read,
         2=random-read/write
         3=Read-backwards,
         4=Re-write-record,
         5=stride-read,
         6=fwrite/re-fwrite
         7=fread/Re-fread,
         8=random_mix,
         9=pwrite/Re-pwrite,
         10=pread/Re-pread
         11=pwritev/Re-pwritev,
         12=preadv/Re-preadv
-o  # Writes are synch (O_SYNC)