[Gluster-users] Gluster native mount is really slow compared to nfs

[Soumya Koduri]

+ Ambarish

On 07/11/2017 02:31 PM, Jo Goossens wrote:
> Hello,
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> We tried tons of settings to get a php app running on a native gluster
> mount:
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> e.g.: 192.168.140.41:/www /var/www glusterfs
> defaults,_netdev,backup-volfile-servers=192.168.140.42:192.168.140.43,direct-io-mode=disable
> 0 0
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> I tried some mount variants in order to speed up things without luck.
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> After that I tried nfs (native gluster nfs 3 and ganesha nfs 4), it was
> a crazy performance difference.
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> e.g.: 192.168.140.41:/www /var/www nfs4 defaults,_netdev 0 0
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> I tried a test like this to confirm the slowness:
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> ./smallfile_cli.py  --top /var/www/test --host-set 192.168.140.41
> --threads 8 --files 5000 --file-size 64 --record-size 64
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> This test finished in around 1.5 seconds with NFS and in more than 250
> seconds without nfs (can't remember exact numbers, but I reproduced it
> several times for both).
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> With the native gluster mount the php app had loading times of over 10
> seconds, with the nfs mount the php app loaded around 1 second maximum
> and even less. (reproduced several times)
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> I tried all kind of performance settings and variants of this but not
> helped , the difference stayed huge, here are some of the settings
> played with in random order:
>

Request Ambarish & Karan (cc'ed who have been working on evaluating 
performance of various access protocols gluster supports) to look at the 
below settings and provide inputs.

Thanks,
Soumya

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> gluster volume set www features.cache-invalidation on
> gluster volume set www features.cache-invalidation-timeout 600
> gluster volume set www performance.stat-prefetch on
> gluster volume set www performance.cache-samba-metadata on
> gluster volume set www performance.cache-invalidation on
> gluster volume set www performance.md-cache-timeout 600
> gluster volume set www network.inode-lru-limit 250000
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> gluster volume set www performance.cache-refresh-timeout 60
> gluster volume set www performance.read-ahead disable
> gluster volume set www performance.readdir-ahead on
> gluster volume set www performance.parallel-readdir on
> gluster volume set www performance.write-behind-window-size 4MB
> gluster volume set www performance.io-thread-count 64
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> gluster volume set www performance.client-io-threads on
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> gluster volume set www performance.cache-size 1GB
> gluster volume set www performance.quick-read on
> gluster volume set www performance.flush-behind on
> gluster volume set www performance.write-behind on
> gluster volume set www nfs.disable on
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> gluster volume set www client.event-threads 3
> gluster volume set www server.event-threads 3
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> The NFS ha adds a lot of complexity which we wouldn't need at all in our
> setup, could you please explain what is going on here? Is NFS the only
> solution to get acceptable performance? Did I miss one crucial settting
> perhaps?
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> We're really desperate, thanks a lot for your help!
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> PS: We tried with gluster 3.11 and 3.8 on Debian, both had terrible
> performance when not used with nfs.
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> Kind regards
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> Jo Goossens
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