Bindfs adding delay while copying the files about bindfs HOT 4 CLOSED

It is surprising that the rate limiting flags have such a large impact. That appears to be a bug.

Other than that, it doesn't surprise me that bindfs is by default quite a bit slower than direct filesystem access. Some overhead will always be unavoidable, but I think some of it is due to various caches being disabled, because the source directory's content can in general change independently. You can experiment with the flags documented in man mount.fuse.

Also, Debian Stretch is quite old and has only FUSE 2, but FUSE 3 comes with new perormance-related options, such as writeback_cache.

If you're interested, you can also compare bindfs performance to the example passthrough filesystems that come with FUSE (called fusexmp_fh in the FUSE 2 branch). I'd expect them to be similar, given the same caching flags.

from bindfs.

Thank you for the quick response. I will experiment with few fuse flags to see if there are any differences. I will share my findings soon.

from bindfs.

Hi Martin,

Thank you for the suggestion and apologies for getting back to you late. Please find our findings below:

• Upgrading to FUSE 3 resulted in a huge performance boost.

• The rate limit flags resulted in little to no impact and the amount of time it took to write the 500kb was only about 4.1 seconds compared to a local folder which was about 2.2 seconds.

• Local Folder
  real 0m2.248s
  user 0m0.623s
  sys 0m0.528s

• Bindfs 1.17
  real 0m3.820s
  user 0m0.628s
  sys 0m0.553s

• Bindfs 1.17 with --read-rate=1T --write-rate=1T
  real 0m4.098s
  user 0m0.679s
  sys 0m0.551s

These results are not averages and might have some margin of error. However, they are enough to say FUSE 3 is yielding better performance than the default binary available on Debian 11, so thank you for the suggestion!

Also, I'm wondering if bindfs can be compiled and statically linked with libfuse3 and released to apt-get?

from bindfs.

It's interesting that FUSE 3 has such a large impact. Thanks for following up!

Also, I'm wondering if bindfs can be compiled and statically linked with libfuse3 and released to apt-get?

Debian will almost certainly not accept such a change for the stable distro, but for unstable it might.
(Static linking is probably unnecessary and counterproductive in this case.)

from bindfs.