Lot of open files with 1.18.1

[bra (Attila Nagy)]

Hi,

I have a two peer setup, one side is Linux and the other is FreeBSD, running 1.18.1. The FreeBSD side is encrypted. The Linux side is the source, which I want to synchronise to the FreeBSD side. The former has the following state:

                           files     dirs       size
Local State (Total) 	 358,741   61,967   ~155 GiB

During watching the process I found out that the FreeBSD process has a lot of open file descriptors, which slowly build up during the sync:

procstat -f 21452
721411

From these 721375 are actual files from the synchronised folders.

The open files are all similar: /finestra/cvs/9.syncthing-enc/V8/F0T9J11975UJB388AC5CV3MFJG14R3PH00DD8STH17I47OJPGEROVP31PHLP6IGN5JGQBHQSFITOKGHF0S57LVB26PRNM6LL99OV7NM1V3MRJNQ32RAIGG411R02QO6LV0FJU5OGRGO8GCC

On the other side, the Linux version keeps very few files open

ls /proc/3344916/fd | wc -l
35

And here no actual synchronised files are open, just the usual stuff (pipes, network etc and the DB files).

Is this related to the FreeBSD port of the encrypted files?

[AudriusButkevicius]

This does seem like quite a lot, but I think watching might need a descriptor per file on BSD.

How does it look like if you disable watching?

[calmh (Jakob Borg)]

Yes, this. Every thing that we watch gets a file descriptor on BSD.

[bra (Attila Nagy)]

Thanks a lot guys for the quick response! Confirmed, when I disable watching, the BSD host has the same (low) amount of open descriptors as its Linux counterpart.