Tux3 Report: How fast can we fsync?

[Mike Galbraith]

On Wed, 2015-04-29 at 00:23 -0700, Daniel Phillips wrote:
> On Tuesday, April 28, 2015 11:33:33 PM PDT, Mike Galbraith wrote:
> > On Tue, 2015-04-28 at 23:01 -0700, Daniel Phillips wrote:
> >> On Tuesday, April 28, 2015 7:21:11 PM PDT, Mike Galbraith wrote:
> >>> Where does tux3 live?  What I found looked abandoned.
> >> 
> >> Current work is here:
> >> 
> >>    https://github.com/OGAWAHirofumi/linux-tux3
> >> 
> >> Note, the new fsync code isn't pushed to that tree yet, however Hirofumi's
> >> optimized syncfs is already in there, which isn't a lot slower.
> >
> > Ah, I did find the right spot, it's just been idle a while.  Where does
> > one find mkfs.tux3?
> 
> Hi Mike,
> 
> See my reply to Richard. You are right, we have been developing on 
> Hirofumi's
> branch and master is getting old. Short version:
> 
>   checkout hirofumi-user
>   cd fs/tux3/user
>   make
>   ./tux3 mkfs <volume>

Ok, thanks.

I was curious about horrible looking plain ole dbench numbers you
posted, as when I used to play with it, default looked like a kinda
silly non-io test most frequently used to pile threads on a box to see
when the axles started bending.  Seems default load has changed.

With dbench v4.00, tux3 seems to be king of the max_latency hill, but
btrfs took throughput on my box.  With v3.04, tux3 took 1st place at
splashing about in pagecache, but last place at dbench -S.

Hohum, curiosity satisfied.

/usr/local/bin/dbench -t 30 (version 4.00)

ext4	Throughput 31.6148 MB/sec  8 clients  8 procs  max_latency=1696.854 ms
xfs	Throughput 26.4005 MB/sec  8 clients  8 procs  max_latency=1508.581 ms
btrfs	Throughput 82.3654 MB/sec  8 clients  8 procs  max_latency=1274.960 ms
tux3	Throughput 93.0047 MB/sec  8 clients  8 procs  max_latency=99.712 ms

ext4	Throughput 49.9795 MB/sec  16 clients  16 procs  max_latency=2180.108 ms
xfs	Throughput 35.038 MB/sec  16 clients  16 procs  max_latency=3107.321 ms
btrfs	Throughput 148.894 MB/sec  16 clients  16 procs  max_latency=618.070 ms
tux3	Throughput 130.532 MB/sec  16 clients  16 procs  max_latency=141.743 ms

ext4	Throughput 69.2642 MB/sec  32 clients  32 procs  max_latency=3166.374 ms
xfs	Throughput 55.3805 MB/sec  32 clients  32 procs  max_latency=4921.660 ms
btrfs	Throughput 230.488 MB/sec  32 clients  32 procs  max_latency=3673.387 ms
tux3	Throughput 179.473 MB/sec  32 clients  32 procs  max_latency=194.046 ms

/usr/local/bin/dbench -B fileio -t 30 (version 4.00)

ext4	Throughput 84.7361 MB/sec  32 clients  32 procs  max_latency=1401.683 ms
xfs	Throughput 57.9369 MB/sec  32 clients  32 procs  max_latency=1397.910 ms
btrfs	Throughput 268.738 MB/sec  32 clients  32 procs  max_latency=639.411 ms
tux3	Throughput 186.172 MB/sec  32 clients  32 procs  max_latency=167.389 ms

/usr/bin/dbench -t 30 32 (version 3.04)

ext4	Throughput 7920.95 MB/sec 32 procs
xfs	Throughput 674.993 MB/sec 32 procs
btrfs	Throughput 1910.63 MB/sec 32 procs
tux3	Throughput 8262.68 MB/sec 32 procs

/usr/bin/dbench -S -t 30 32 (version 3.04)
ext4	Throughput 87.2774 MB/sec (sync dirs) 32 procs
xfs	Throughput 89.3977 MB/sec (sync dirs) 32 procs
btrfs	Throughput 101.888 MB/sec (sync dirs) 32 procs
tux3	Throughput 78.7463 MB/sec (sync dirs) 32 procs