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Date:      Sun, 13 Nov 2016 10:57:05 +0100
From:      Hagen =?UTF-8?B?S8O8aGw=?= <hagen@nornagest.de>
To:        freebsd-questions@freebsd.org
Subject:   Programs that watch a huge amount of files slow down the whole system
Message-ID:  <20161113105705.6fd24f92@kvoth.localdomain>

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Hello,

I've noticed this behaviour first with net/syncthing-inotify and now
with graphics/digikam. Both try to monitor files for changes and as
far as I understand the method used for this is fundamentally different
in Linux and FreeBSD. So in FreeBSD the program has to get a filehandle
for each file. 

When the number of open files (sysctl kern.openfiles) gets very big the
system slows down. (It can take a minute to open a new temrinal for me)

Is there anything I can do (except avoiding these applications or
letting them manage less files) to avoid this?

Is there a way to monitor these files without keeping filehandles for
each? (So I could maybe create a patch) Or is there a way to prevent
the system from slowing down so much when managing a lot of filehandles?

Thanks in advance and best regards,

Hagen



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