我想用以下命令来衡量我的磁盘输送量:
dd if=/dev/zero of=/mydir/junkfile bs=4k count=125000
如果垃圾文件存在, 我的磁盘传输量比垃圾文件不存在小六倍。 我重复过很多次, 结果仍然有效 。 有人知道为什么吗?
谢谢
阿米尔 Amir.
In order to minimize disk caching, you need to copy an amount significantly larger than the amount of memory in your system. 2X the amount of RAM in your server is a useful amount.
http://www.westnet.com/~gsmith/content/posgresql/pg-diskest.htm" rel=“no follow” >http://www.westnet.com/~gsmith/content/posgresql/pg-disksument.htm
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