[Gluster-users] Extremely slow file listing in folders with many files

[Artem Russakovskii]

Hi Strahil, in the original email I included both the times for the first
and subsequent reads on the fuse mounted gluster volume as well as the xfs
filesystem the gluster data resides on (this is the brick, right?).

On Thu, Apr 30, 2020, 7:44 AM Strahil Nikolov <hunter86_bg at yahoo.com> wrote:

> On April 30, 2020 4:24:23 AM GMT+03:00, Artem Russakovskii <
> archon810 at gmail.com> wrote:
> >Hi all,
> >
> >We have 500GB and 10TB 4x1 replicate xfs-based gluster volumes, and the
> >10TB one especially is extremely slow to do certain things with (and
> >has
> >been since gluster 3.x when we started). We're currently on 5.13.
> >
> >The number of files isn't even what I'd consider that great - under
> >100k
> >per dir.
> >
> >Here are some numbers to look at:
> >
> >On gluster volume in a dir of 45k files:
> >The first time
> >
> >time find | wc -l
> >45423
> >real    8m44.819s
> >user    0m0.459s
> >sys     0m0.998s
> >
> >And again
> >
> >time find | wc -l
> >45423
> >real    0m34.677s
> >user    0m0.291s
> >sys     0m0.754s
> >
> >
> >If I run the same operation on the xfs block device itself:
> >The first time
> >
> >time find | wc -l
> >45423
> >real    0m13.514s
> >user    0m0.144s
> >sys     0m0.501s
> >
> >And again
> >
> >time find | wc -l
> >45423
> >real    0m0.197s
> >user    0m0.088s
> >sys     0m0.106s
> >
> >
> >I'd expect a performance difference here but just as it was several
> >years
> >ago when we started with gluster, it's still huge, and simple file
> >listings
> >are incredibly slow.
> >
> >At the time, the team was looking to do some optimizations, but I'm not
> >sure this has happened.
> >
> >What can we do to try to improve performance?
> >
> >Thank you.
> >
> >
> >
> >Some setup values follow.
> >
> >xfs_info /mnt/SNIP_block1
> >meta-data=/dev/sdc               isize=512    agcount=103,
> >agsize=26214400
> >blks
> >         =                       sectsz=512   attr=2, projid32bit=1
> >      =                       crc=1        finobt=1, sparse=0, rmapbt=0
> >         =                       reflink=0
> >data     =                       bsize=4096   blocks=2684354560,
> >imaxpct=25
> >         =                       sunit=0      swidth=0 blks
> >naming   =version 2              bsize=4096   ascii-ci=0, ftype=1
> >log      =internal log           bsize=4096   blocks=51200, version=2
> >        =                       sectsz=512   sunit=0 blks, lazy-count=1
> >realtime =none                   extsz=4096   blocks=0, rtextents=0
> >
> >Volume Name: SNIP_data1
> >Type: Replicate
> >Volume ID: SNIP
> >Status: Started
> >Snapshot Count: 0
> >Number of Bricks: 1 x 4 = 4
> >Transport-type: tcp
> >Bricks:
> >Brick1: nexus2:/mnt/SNIP_block1/SNIP_data1
> >Brick2: forge:/mnt/SNIP_block1/SNIP_data1
> >Brick3: hive:/mnt/SNIP_block1/SNIP_data1
> >Brick4: citadel:/mnt/SNIP_block1/SNIP_data1
> >Options Reconfigured:
> >cluster.quorum-count: 1
> >cluster.quorum-type: fixed
> >network.ping-timeout: 5
> >network.remote-dio: enable
> >performance.rda-cache-limit: 256MB
> >performance.readdir-ahead: on
> >performance.parallel-readdir: on
> >network.inode-lru-limit: 500000
> >performance.md-cache-timeout: 600
> >performance.cache-invalidation: on
> >performance.stat-prefetch: on
> >features.cache-invalidation-timeout: 600
> >features.cache-invalidation: on
> >cluster.readdir-optimize: on
> >performance.io-thread-count: 32
> >server.event-threads: 4
> >client.event-threads: 4
> >performance.read-ahead: off
> >cluster.lookup-optimize: on
> >performance.cache-size: 1GB
> >cluster.self-heal-daemon: enable
> >transport.address-family: inet
> >nfs.disable: on
> >performance.client-io-threads: on
> >cluster.granular-entry-heal: enable
> >cluster.data-self-heal-algorithm: full
> >
> >Sincerely,
> >Artem
> >
> >--
> >Founder, Android Police <http://www.androidpolice.com>, APK Mirror
> ><http://www.apkmirror.com/>, Illogical Robot LLC
> >beerpla.net | @ArtemR <http://twitter.com/ArtemR>
>
> Hi Artem,
>
> Have you checked the same on brick level ? How big is the difference ?
>
> Best Regards,
> Strahil Nikolov
>
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