http://blog.chinaunix.net/uid-223060-id-2127385.html

http://blog.csdn.net/hhtang/article/details/6605951

查看磁盤分區：

#df -h

#tune2fs -l /dev/mapper/VolGroup-lv_root

或者

#dumpe2fs /dev/mapper/VolGroup-lv_root|grep -i "block size"

#man? open

O_DIRECT (Since Linux 2.4.10)Try  to  minimize cache effects of the I/O to and from this file.  In general this will degrade performance, but it is useful in specialsituations, such as when applications do their own caching.  File I/O is done directly to/from user space  buffers.   The  I/O  is  syn-chronous, that is, at the completion of a read(2) or write(2), data is guaranteed to have been transferred.  See NOTES below for furtherdiscussion.A semantically similar (but deprecated) interface for block devices is described in raw(8).



總結

以上是生活随笔為你收集整理的open的O_DIRECT选项的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。