[lkml]   [2016]   [Jun]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH] FUSE: Improve aio directIO write performance for size extending writes.
On Thu, Jun 16, 2016 at 2:01 PM, Miklos Szeredi <> wrote:
> On Thu, Jun 16, 2016 at 1:51 PM, Sedat Dilek <> wrote:
>> On Thu, Jun 16, 2016 at 1:25 PM, Miklos Szeredi <> wrote:
>>> On Thu, Apr 7, 2016 at 1:48 PM, Ashish Sangwan <> 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 <>
>>> Thanks for you patience. Pushed to
>>> 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?


- Sedat -

 \ /
  Last update: 2016-06-16 14:41    [W:0.095 / U:1.292 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site