Re: Is user-space AIO dead?

[David Lloyd]

On Wed, 11 Jan 2006, Kenny Simpson wrote:

> Hi,
>  Having read the excellent paper by IBM presented at the 2003 OLS about Asynchronous I/O Support
> in Linux 2.5, I found the conclusion rather disappointing:
> "In conclusion, there appears to be no conditions for raw or O_DIRECT access under which AIO can
> show a noticable benefit." - p385.
> http://archive.linuxsymposium.org/ols2003/Proceedings/All-Reprints/Reprint-Pulavarty-OLS2003.pdf
>
> Is this still the case?
>
> If I want a transactional engine (like a database) that needs to persist to stable storage, is it
> still best to use a helper thread to do write/fsync or O_SYNC|O_DIRECT?

Wouldn't nonblocking I/O on regular files be nice?

- D
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