Re: [GitHub] [lucene] david-sitsky commented on issue #12185: Using DirectIODirectory results in BufferOverflowException

[Michael Sokolov <ms...@gmail.com>]

Using directio with nfs makes no sense at all to me, I think that is the
problem in a nutshell. Directio tries to bypass the operating systems
buffers, but that's not going to play nicely with nfs.

On Wed, Mar 22, 2023, 4:38 PM david-sitsky (via GitHub) <gi...@apache.org>
wrote:

>
> david-sitsky commented on issue #12185:
> URL: https://github.com/apache/lucene/issues/12185#issuecomment-1480390389
>
>    As an aside, in some standard benchmark tests I run with our product, I
> have found the final optimisation of Lucene indexes after all the data has
> been indexed took 36 seconds with NIO, but 148 seconds with NIO+DirectIO
> enabled.  For mmap, optimisation took 30 seconds but 100 seconds with
> DirectIO was enabled.  So it is odd the use-case DirectIO was meant to
> speed up actually seemed to be slower..
>
>
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