Messages in this thread | | | Date | Wed, 11 Jan 2006 11:20:56 -0800 (PST) | From | Kenny Simpson <> | Subject | Re: Is user-space AIO dead? |
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--- David Lloyd <dmlloyd@tds.net> wrote:
> On Wed, 11 Jan 2006, Kenny Simpson wrote: > > > --- David Lloyd <dmlloyd@tds.net> 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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