This is a V3 mount only.

There are a bunch of socket and anonymous fds opened, but that only 554. In current state my setup has 4055 fds opened and it won't make any progress for days even without any new I/O coming in. I have a coredump, please let me know what info you need out of it to debug this.

# ls -l  /proc/2576/fd | wc -l

554

On Mon, Jun 18, 2018 at 7:12 AM Malahal Naineni <malahal@gmail.com> wrote:

Try to find the open files by doing "ls -l  /proc/<PID>/fds".  Are you using NFSv4 or V3? If this is all a V3, then clearly a bug. NFSv4 may imply some clients opened the files but never closed for some reason or we ignored client's CLOSE request.

On Mon, Jun 18, 2018 at 7:30 PM bharat singh <bharat064015@gmail.com> wrote:

I already have this patch

c2b448b1a079ed66446060a695e4dd06d1c3d1c2 Fix closing global file descriptors

On Mon, Jun 18, 2018 at 5:41 AM Daniel Gryniewicz <dang@redhat.com> wrote:

Try this one:

5c2efa8f077fafa82023f5aec5e2c474c5ed2fdf Fix closing global file descriptors

Daniel


On 06/15/2018 03:08 PM, bharat singh wrote:
> I have been testing Ganesha 2.5.4 code with default mdcache settings. It
> starts showing issues after prolonged I/O runs.
> Once it exhausts all the allowed fds, its kind of gets stuck
> returning ERR_FSAL_DELAY for every client op.
>
> A snapshot of the mdcache
>
> open_fd_count = 4055
> lru_state = {
>    entries_hiwat = 100000,
>    entries_used = 323,
>    chunks_hiwat = 100000,
>    chunks_used = 9,
>    fds_system_imposed = 4096,
>    fds_hard_limit = 4055,
>    fds_hiwat = 3686,
>    fds_lowat = 2048,
>    futility = 109,
>    per_lane_work = 50,
>    biggest_window = 1638,
>    prev_fd_count = 4055,
>    prev_time = 1529013538,
>    fd_state = 3
> }
>
> [cache_lru] lru_run :INODE LRU :INFO :After work, open_fd_count:4055 
> entries used count:327 fdrate:0 threadwait=9
> [cache_lru] lru_run :INODE LRU :INFO :lru entries: 327 open_fd_count:4055
> [cache_lru] lru_run :INODE LRU :INFO :lru entries: 327open_fd_count:4055
> [cache_lru] lru_run :INODE LRU :INFO :After work, open_fd_count:4055 
> entries used count:327 fdrate:0 threadwait=90
>
> I have killed the NFS clients, so no new I/O is being received. But even
> after a couple of hours I don't see lru_run making any progress, thereby
> open_fd_count remains a 4055 and even a single file open won't be
> served. So basically the server is in stuck state.
>
> I have these changes patched over 2.5.4 code
> e2156ad3feac841487ba89969769bf765457ea6e Replace cache_fds parameter and
> handling with better logic
> 667083fe395ddbb4aa14b7bbe7e15ffca87e3b0b MDCACHE - Change and lower
> futility message
> 37732e61985d919e6ca84dfa7b4a84163080abae Move open_fd_count from MDCACHE
> to FSALs (https://review.gerrithub.io/#/c/391267/)
>
> Any suggestions how to resolve this ?
>
>
>
>
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--

-Bharat

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