Re: [fuse-devel] [fuse] Unexpectedly large number of getattr() and lookup requests

[Nikolaus Rath <Nikolaus@rath.org>]

On Nov 30 2018, Miklos Szeredi <miklos@szeredi.hu> wrote:
> On Thu, Nov 29, 2018 at 10:20 PM Nikolaus Rath <Nikolaus@rath.org> wrote:
>>
>> Hello,
>>
>> I am seeing an unexpectedly large number of getattr() and lookup()
>> requests being sent to userspace fuse. I am setting a very large
>> attr_timeout and entry_timeout, so I would have expected that the
>> maximum number of getattr() and lookup() requests is capped by the
>> number of distinct files in the filesystem plus the number of forget
>> requests.
>>
>> However, actual numbers are much higher. For example, when running tests
>> on a filesystem with 2960 directory entries, I am getting scenarios
>> with 203447 lookup requests, 12970 getattr requests, and zero forget
>> requests.
>>
>> Did I misunderstand something about how dentry and attribute caching
>> works?
>
> Debug log might be useful.

Here you go!

https://www.dropbox.com/s/tg4vyshz4g18sub/fuse-debug.log.xz?dl=1


Best,
-Nikolaus

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