linux-kernel - Re: [PATCH] FUSE: Improve aio directIO write performance for size extending writes.

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Date:	Thu, 16 Jun 2016 14:22:34 +0200
From:	Sedat Dilek <sedat.dilek@...il.com>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	Ashish Sangwan <ashishsangwan2@...il.com>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] FUSE: Improve aio directIO write performance for size
 extending writes.

On Thu, Jun 16, 2016 at 2:01 PM, Miklos Szeredi <miklos@...redi.hu> wrote:
> On Thu, Jun 16, 2016 at 1:51 PM, Sedat Dilek <sedat.dilek@...il.com> wrote:
>> On Thu, Jun 16, 2016 at 1:25 PM, Miklos Szeredi <miklos@...redi.hu> wrote:
>>> On Thu, Apr 7, 2016 at 1:48 PM, Ashish Sangwan <ashishsangwan2@...il.com> wrote:
>>>> While sending the blocking directIO in fuse, the write request is broken
>>>> into sub-requests, each of default size 128k and all the requests are sent
>>>> in non-blocking background mode if async_dio mode is supported by libfuse.
>>>> The process which issue the write wait for the completion of all the
>>>> sub-requests. Sending multiple requests parallely gives a chance to perform
>>>> parallel writes in the user space fuse implementation if it is
>>>> multi-threaded and hence improves the performance.
>>>>
>>>> When there is a size extending aio dio write, we switch to
>>>> blocking mode so that we can properly update the size of the file after
>>>> completion of the writes. However, in this situation all the sub-requests
>>>> are sent in serialized manner where the next request is sent only after
>>>> receiving the reply of the current request. Hence the multi-threaded user
>>>> space implementation is not utilized properly.
>>>>
>>>> This patch changes the size extending aio dio behavior to exactly follow
>>>> blocking dio. For multi threaded fuse implementation having 10 threads and
>>>> using buffer size of 64MB to perform async directIO, we are getting double
>>>> the speed.
>>>>
>>>> Signed-off-by: Ashish Sangwan <ashishsangwan2@...il.com>
>>>
>>> Thanks for you patience.  Pushed to
>>>
>>>   git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse.git for-next
>>>
>>> I simplified the logic, please verify that I didn't mess something up.
>>>
>>
>> Hi,
>>
>> I would like to test fuse-next on Ubuntu/precise aka 12.04-LTS AMD64.
>>
>> Do I need a modern version of libfuse?
>> Libfuse v2.8.6 is installed here.
>
> Fuse will work fine but AFAICS the "async_dio" option was not added to
> a 2.X release (it could be backported quite simply if needed).
>

Can you point me to - preferable - a Git repo of libfuse?
And the commit for backporting?

Thanks.

- Sedat -