[Gluster-users] small files performance

Thu Oct 12 05:18:43 UTC 2017

Hi, 

Parallel-readdir is an experimental feature for 3.10, can you disable performance.parallel-readdir option and see if the files are visible? Does the unmount-mount help? 
Also If you want to use parallel-readdir in production please use 3.11 or greater. 

Regards, 
Poornima 

----- Original Message -----

> From: "Alastair Neil" <ajneil.tech at gmail.com>
> To: "gluster-users" <Gluster-users at gluster.org>
> Sent: Wednesday, October 11, 2017 3:29:10 AM
> Subject: Re: [Gluster-users] small files performance

> I just tried setting:

> performance.parallel-readdir on
> features.cache-invalidation on
> features.cache-invalidation-timeout 600
> performance.stat-prefetch
> performance.cache-invalidation
> performance.md-cache-timeout 600
> network.inode-lru-limit 50000
> performance.cache-invalidation on

> and clients could not see their files with ls when accessing via a fuse
> mount. The files and directories were there, however, if you accessed them
> directly. Server are 3.10.5 and the clients are 3.10 and 3.12.

> Any ideas?

> On 10 October 2017 at 10:53, Gandalf Corvotempesta <
> gandalf.corvotempesta at gmail.com > wrote:

> > 2017-10-10 8:25 GMT+02:00 Karan Sandha < ksandha at redhat.com > :
> 

> > > Hi Gandalf,
> > 
> 

> > > We have multiple tuning to do for small-files which decrease the time for
> > > negative lookups , meta-data caching, parallel readdir. Bumping the
> > > server
> > > and client event threads will help you out in increasing the small file
> > > performance.
> > 
> 

> > > gluster v set <vol-name> group metadata-cache
> > 
> 
> > > gluster v set <vol-name> group nl-cache
> > 
> 
> > > gluster v set <vol-name> performance.parallel-readdir on (Note : readdir
> > > should be on)
> > 
> 

> > This is what i'm getting with suggested parameters.
> 
> > I'm running "fio" from a mounted gluster client:
> 
> > 172.16.0.12:/gv0 on /mnt2 type fuse.glusterfs
> > (rw,relatime,user_id=0,group_id=0,default_permissions,allow_other,max_read=131072)
> 

> > # fio --ioengine=libaio --filename=fio.test --size=256M --direct=1
> > --rw=randrw --refill_buffers --norandommap --bs=8k --rwmixread=70
> > --iodepth=16 --numjobs=16 --runtime=60 --group_reporting --name=fio-test
> 
> > fio-test: (g=0): rw=randrw, bs=8K-8K/8K-8K/8K-8K, ioengine=libaio,
> > iodepth=16
> 
> > ...
> 
> > fio-2.16
> 
> > Starting 16 processes
> 
> > fio-test: Laying out IO file(s) (1 file(s) / 256MB)
> 
> > Jobs: 14 (f=13): [m(5),_(1),m(8),f(1),_(1)] [33.9% done] [1000KB/440KB/0KB
> > /s] [125/55/0 iops] [eta 01m:59s]
> 
> > fio-test: (groupid=0, jobs=16): err= 0: pid=2051: Tue Oct 10 16:51:46 2017
> 
> > read : io=43392KB, bw=733103B/s, iops=89, runt= 60610msec
> 
> > slat (usec): min=14, max=1992.5K, avg=177873.67, stdev=382294.06
> 
> > clat (usec): min=768, max=6016.8K, avg=1871390.57, stdev=1082220.06
> 
> > lat (usec): min=872, max=6630.6K, avg=2049264.23, stdev=1158405.41
> 
> > clat percentiles (msec):
> 
> > | 1.00th=[ 20], 5.00th=[ 208], 10.00th=[ 457], 20.00th=[ 873],
> 
> > | 30.00th=[ 1237], 40.00th=[ 1516], 50.00th=[ 1795], 60.00th=[ 2073],
> 
> > | 70.00th=[ 2442], 80.00th=[ 2835], 90.00th=[ 3326], 95.00th=[ 3785],
> 
> > | 99.00th=[ 4555], 99.50th=[ 4948], 99.90th=[ 5211], 99.95th=[ 5800],
> 
> > | 99.99th=[ 5997]
> 
> > write: io=18856KB, bw=318570B/s, iops=38, runt= 60610msec
> 
> > slat (usec): min=17, max=3428, avg=212.62, stdev=287.88
> 
> > clat (usec): min=59, max=6015.6K, avg=1693729.12, stdev=1003122.83
> 
> > lat (usec): min=79, max=6015.9K, avg=1693941.74, stdev=1003126.51
> 
> > clat percentiles (usec):
> 
> > | 1.00th=[ 724], 5.00th=[144384], 10.00th=[403456], 20.00th=[765952],
> 
> > | 30.00th=[1105920], 40.00th=[1368064], 50.00th=[1630208],
> > | 60.00th=[1875968],
> 
> > | 70.00th=[2179072], 80.00th=[2572288], 90.00th=[3031040],
> > | 95.00th=[3489792],
> 
> > | 99.00th=[4227072], 99.50th=[4423680], 99.90th=[4751360],
> > | 99.95th=[5210112],
> 
> > | 99.99th=[5996544]
> 
> > lat (usec) : 100=0.15%, 250=0.05%, 500=0.06%, 750=0.09%, 1000=0.05%
> 
> > lat (msec) : 2=0.28%, 4=0.09%, 10=0.15%, 20=0.39%, 50=1.81%
> 
> > lat (msec) : 100=1.02%, 250=1.63%, 500=5.59%, 750=6.03%, 1000=7.31%
> 
> > lat (msec) : 2000=35.61%, >=2000=39.67%
> 
> > cpu : usr=0.01%, sys=0.01%, ctx=8218, majf=11, minf=295
> 
> > IO depths : 1=0.2%, 2=0.4%, 4=0.8%, 8=1.6%, 16=96.9%, 32=0.0%, >=64=0.0%
> 
> > submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
> 
> > complete : 0=0.0%, 4=99.8%, 8=0.0%, 16=0.2%, 32=0.0%, 64=0.0%, >=64=0.0%
> 
> > issued : total=r=5424/w=2357/d=0, short=r=0/w=0/d=0, drop=r=0/w=0/d=0
> 
> > latency : target=0, window=0, percentile=100.00%, depth=16
> 

> > Run status group 0 (all jobs):
> 
> > READ: io=43392KB, aggrb=715KB/s, minb=715KB/s, maxb=715KB/s,
> > mint=60610msec,
> > maxt=60610msec
> 
> > WRITE: io=18856KB, aggrb=311KB/s, minb=311KB/s, maxb=311KB/s,
> > mint=60610msec,
> > maxt=60610msec
> 

> > _______________________________________________
> 
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> 
> > Gluster-users at gluster.org
> 
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> 

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