--- David Lloyd <[email protected]> wrote:
> On Wed, 11 Jan 2006, Kenny Simpson wrote:
>
> > --- David Lloyd <[email protected]> wrote:
> >> Wouldn't nonblocking I/O on regular files be nice?
> >
> > Yes it could be. As I understand it, regular file writes (not O_DIRECT)
> > are only to the page cache and only block when there is memory pressure
> > (so it is more of a throttle).
>
> If you were however using O_DIRECT or O_SYNC, you would then have a
> mechanism to know when your writes have made it to disk, which might be
> useful for transactional systems.
Right, but I'm not sure O_DIRECT implies stable storage, only data sent out to the device, not
held up in the page cache (I could be wrong).
AIO is implemented for O_DIRECT according to the paper, but they observed it not having benefit.
AIO being implemented to O_SYNC would be nice for my use, as it would also eliminate the extra
alignment restrictions brought on by O_DIRECT.
-Kenny
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