How can we verify that asynchronous I/O is being used?

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# asynchronous I/O #used

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本文档详细解释了在Red Hat Enterprise Linux 5中启用oracle参数filesystemio_option以使用异步I/O的过程。文中说明无需额外的内核或文件系统选项设置即可支持AIO，并提供了通过检查/proc/sys/fs/aio-nr文件来验证AIO是否正在使用的具体方法。

https://access.redhat.com/solutions/69753

SOLUTION UNVERIFIED - 已更新 2018年十二月24日20:13 -

English

环境

Red Hat Enterprise Linux 5

问题

Enabled oracle parameter filesystemio_option="SetAll" to enable use of asynchronous I/O.
What additional kernel/filesystem parameter or option is required for support of AIO?
How can we verify that asynchronous I/O is actually being used?

决议

There are no additional kernel or fileystem options to set for AIO use. The application will change to utilize the appropriate AIO calls to effect the change.
You can verify that AIO is being utilized via the file /proc/sys/fs/aio-nr. When the AIO application is running and using asynchronous IO, the content of this file will be non-zero.