Real async file IO on Linux?

[Avinash Lakshman]

That is sad. I was under the impression that it was all completely AIO. Is
this going to be changed or left as is?

Regards
Avinash

On Wed, Jul 27, 2011 at 6:17 AM, Alan Bateman <Alan.Bateman at oracle.com>wrote:

> Tim Fox wrote:
>
>> Hello All,
>>
>> In anticipation of the iminent Java 7 release, I took a look at the source
>> for asynchronous file IO, and it seems to be "faking" async IO by hiding old
>> synchronous IO behind a thread pool.
>>
>> I'm interested in understanding why real OS async file IO hasn't been used
>> for those operating systems that support it. I'm particularly interested in
>> Linux support.
>>
> The issue at the time on Linux was that it wasn't supported for buffered
> file I/O (only direct I/O or block device). I haven't checked it recently to
> see if that was changed. It wouldn't be too hard to provide an
> implementation that uses io_submit etc. but it would like require us to
> provide a special open option and also provide a means to ensure that
> applications get direct buffers that are aligned appropriately.
>
> -Alan.
>
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