Correct! That's what has to get fixed. However, there is no point in doing
this if the majority of a vector read hits individual pages. We need to
understand the vector read before deciding where to apply limited effort.
Enabling AIO would do nothing as Ceph AIO reverts to synchrnous I/O.
On Mon, 10 Aug 2020, Matev? Tadel wrote:
> Thanks! The problem is that XrdCephOssFile does not implement ReadV at all and so it gets serialized at the parent class level, right?
>
> Also, Read() always calls ceph_posix_pread() which only handles one block at a time and so requires two calls if the request is straddling two ceph blocks.
>
> Would enabling AIO help here? It seems to be implemented there.
>
>
>
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