[Gluster-users] GlusterFS 3.7 - slow/poor performances

Ben Turner bturner at redhat.com
Tue Jun 2 19:53:49 UTC 2015 

I am seeing problems on 3.7 as well.  Can you check /var/log/messages on both the clients and servers for hung tasks like:

Jun  2 15:23:14 gqac006 kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Jun  2 15:23:14 gqac006 kernel: iozone        D 0000000000000001     0 21999      1 0x00000080
Jun  2 15:23:14 gqac006 kernel: ffff880611321cc8 0000000000000082 ffff880611321c18 ffffffffa027236e
Jun  2 15:23:14 gqac006 kernel: ffff880611321c48 ffffffffa0272c10 ffff88052bd1e040 ffff880611321c78
Jun  2 15:23:14 gqac006 kernel: ffff88052bd1e0f0 ffff88062080c7a0 ffff880625addaf8 ffff880611321fd8
Jun  2 15:23:14 gqac006 kernel: Call Trace:
Jun  2 15:23:14 gqac006 kernel: [<ffffffffa027236e>] ? rpc_make_runnable+0x7e/0x80 [sunrpc]
Jun  2 15:23:14 gqac006 kernel: [<ffffffffa0272c10>] ? rpc_execute+0x50/0xa0 [sunrpc]
Jun  2 15:23:14 gqac006 kernel: [<ffffffff810aaa21>] ? ktime_get_ts+0xb1/0xf0
Jun  2 15:23:14 gqac006 kernel: [<ffffffff811242d0>] ? sync_page+0x0/0x50
Jun  2 15:23:14 gqac006 kernel: [<ffffffff8152a1b3>] io_schedule+0x73/0xc0
Jun  2 15:23:14 gqac006 kernel: [<ffffffff8112430d>] sync_page+0x3d/0x50
Jun  2 15:23:14 gqac006 kernel: [<ffffffff8152ac7f>] __wait_on_bit+0x5f/0x90
Jun  2 15:23:14 gqac006 kernel: [<ffffffff81124543>] wait_on_page_bit+0x73/0x80
Jun  2 15:23:14 gqac006 kernel: [<ffffffff8109eb80>] ? wake_bit_function+0x0/0x50
Jun  2 15:23:14 gqac006 kernel: [<ffffffff8113a525>] ? pagevec_lookup_tag+0x25/0x40
Jun  2 15:23:14 gqac006 kernel: [<ffffffff8112496b>] wait_on_page_writeback_range+0xfb/0x190
Jun  2 15:23:14 gqac006 kernel: [<ffffffff81124b38>] filemap_write_and_wait_range+0x78/0x90
Jun  2 15:23:14 gqac006 kernel: [<ffffffff811c07ce>] vfs_fsync_range+0x7e/0x100
Jun  2 15:23:14 gqac006 kernel: [<ffffffff811c08bd>] vfs_fsync+0x1d/0x20
Jun  2 15:23:14 gqac006 kernel: [<ffffffff811c08fe>] do_fsync+0x3e/0x60
Jun  2 15:23:14 gqac006 kernel: [<ffffffff811c0950>] sys_fsync+0x10/0x20
Jun  2 15:23:14 gqac006 kernel: [<ffffffff8100b072>] system_call_fastpath+0x16/0x1b

Do you see a perf problem with just a simple DD or do you need a more complex workload to hit the issue?  I think I saw an issue with metadata performance that I am trying to run down, let me know if you can see the problem with simple DD reads / writes or if we need to do some sort of dir / metadata access as well.

-b

----- Original Message -----
> From: "Geoffrey Letessier" <geoffrey.letessier at cnrs.fr>
> To: "Pranith Kumar Karampuri" <pkarampu at redhat.com>
> Cc: gluster-users at gluster.org
> Sent: Tuesday, June 2, 2015 8:09:04 AM
> Subject: Re: [Gluster-users] GlusterFS 3.7 - slow/poor performances
> 
> Hi Pranith,
> 
> I’m sorry but I cannot bring you any comparison because comparison will be
> distorted by the fact in my HPC cluster in production the network technology
> is InfiniBand QDR and my volumes are quite different (brick in RAID6
> (12x2TB), 2 bricks per server and 4 servers into my pool)
> 
> Concerning your demand, in attachments you can find all expected results
> hoping it can help you to solve this serious performance issue (maybe I need
> play with glusterfs parameters?).
> 
> Thank you very much by advance,
> Geoffrey
> ------------------------------------------------------
> Geoffrey Letessier
> Responsable informatique & ingénieur système
> UPR 9080 - CNRS - Laboratoire de Biochimie Théorique
> Institut de Biologie Physico-Chimique
> 13, rue Pierre et Marie Curie - 75005 Paris
> Tel: 01 58 41 50 93 - eMail: geoffrey.letessier at ibpc.fr
> 
> 
> 
> 
> Le 2 juin 2015 à 10:09, Pranith Kumar Karampuri < pkarampu at redhat.com > a
> écrit :
> 
> hi Geoffrey,
> Since you are saying it happens on all types of volumes, lets do the
> following:
> 1) Create a dist-repl volume
> 2) Set the options etc you need.
> 3) enable gluster volume profile using "gluster volume profile <volname>
> start"
> 4) run the work load
> 5) give output of "gluster volume profile <volname> info"
> 
> Repeat the steps above on new and old version you are comparing this with.
> That should give us insight into what could be causing the slowness.
> 
> Pranith
> On 06/02/2015 03:22 AM, Geoffrey Letessier wrote:
> 
> 
> Dear all,
> 
> I have a crash test cluster where i’ve tested the new version of GlusterFS
> (v3.7) before upgrading my HPC cluster in production.
> But… all my tests show me very very low performances.
> 
> For my benches, as you can read below, I do some actions (untar, du, find,
> tar, rm) with linux kernel sources, dropping cache, each on distributed,
> replicated, distributed-replicated, single (single brick) volumes and the
> native FS of one brick.
> 
> # time (echo 3 > /proc/sys/vm/drop_caches; tar xJf ~/linux-4.1-rc5.tar.xz;
> sync; echo 3 > /proc/sys/vm/drop_caches)
> # time (echo 3 > /proc/sys/vm/drop_caches; du -sh linux-4.1-rc5/; echo 3 >
> /proc/sys/vm/drop_caches)
> # time (echo 3 > /proc/sys/vm/drop_caches; find linux-4.1-rc5/|wc -l; echo 3
> > /proc/sys/vm/drop_caches)
> # time (echo 3 > /proc/sys/vm/drop_caches; tar czf linux-4.1-rc5.tgz
> linux-4.1-rc5/; echo 3 > /proc/sys/vm/drop_caches)
> # time (echo 3 > /proc/sys/vm/drop_caches; rm -rf linux-4.1-rc5.tgz
> linux-4.1-rc5/; echo 3 > /proc/sys/vm/drop_caches)
> 
> And here are the process times:
> 
> ---------------------------------------------------------------
> | | UNTAR | DU | FIND | TAR | RM |
> ---------------------------------------------------------------
> | single | ~3m45s | ~43s | ~47s | ~3m10s | ~3m15s |
> ---------------------------------------------------------------
> | replicated | ~5m10s | ~59s | ~1m6s | ~1m19s | ~1m49s |
> ---------------------------------------------------------------
> | distributed | ~4m18s | ~41s | ~57s | ~2m24s | ~1m38s |
> ---------------------------------------------------------------
> | dist-repl | ~8m18s | ~1m4s | ~1m11s | ~1m24s | ~2m40s |
> ---------------------------------------------------------------
> | native FS | ~11s | ~4s | ~2s | ~56s | ~10s |
> ---------------------------------------------------------------
> 
> I get the same results, whether with default configurations with custom
> configurations.
> 
> if I look at the side of the ifstat command, I can note my IO write processes
> never exceed 3MBs...
> 
> EXT4 native FS seems to be faster (roughly 15-20% but no more) than XFS one
> 
> My [test] storage cluster config is composed by 2 identical servers (biCPU
> Intel Xeon X5355, 8GB of RAM, 2x2TB HDD (no-RAID) and Gb ethernet)
> 
> My volume settings:
> single: 1server 1 brick
> replicated: 2 servers 1 brick each
> distributed: 2 servers 2 bricks each
> dist-repl: 2 bricks in the same server and replica 2
> 
> All seems to be OK in gluster status command line.
> 
> Do you have an idea why I obtain so bad results?
> Thanks in advance.
> Geoffrey
> -----------------------------------------------
> Geoffrey Letessier
> 
> Responsable informatique & ingénieur système
> CNRS - UPR 9080 - Laboratoire de Biochimie Théorique
> Institut de Biologie Physico-Chimique
> 13, rue Pierre et Marie Curie - 75005 Paris
> Tel: 01 58 41 50 93 - eMail: geoffrey.letessier at cnrs.fr
> 
> 
> 
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