[Gluster-devel] webservers vs. glusterfs vs. namespace

[Anand Avati]

Sascha,
 Please run by removing AFR (make AFR's first subvolume a direct subvolume
of unify). AFR can potentially flush io-cache pages while doing read
scheduling across subvolumes (by returning inconsistent mtimes with the read
buffer). we are working on fixing this.

avati

2008/1/20, Sascha Ottolski <ottolski at web.de>:
>
> Am Sonntag 20 Januar 2008 01:14:06 schrieb Anand Avati:
> > can you please share your spec files with glusterfs.pastebin.com ?
>
> my pleasure: http://glusterfs.pastebin.com/m8820300
>
>
> Thanks for your time,
>
> Sascha
>
> >
> > thanks,
> > avati
> >
> > 2008/1/20, Sascha Ottolski <ottolski at web.de>:
> > > Am Samstag 19 Januar 2008 11:03:43 schrieb Sascha Ottolski:
> > > > Am Freitag 18 Januar 2008 17:49:15 schrieb Anand Avati:
> > > > > Sascha,
> > > > >  the reason why 1.3.0pre4 might be faster would not be because
> > > > > of the missing namespace, but most likely because of missing
> > > > > self-heal. can you try with 'option self-heal off' in the unify
> > > > > section?
> > > >
> > > > may ask again, any idea why the old apache-1.3 performs way
> > > > better on either gluster version than the others? or any idea
> > > > which knobs to tweak to get more out of the others?
> > >
> > > now, another astonishing observation: if I enable the io-cache, it
> > > has a good effect for apache1 (almost doubles the requests/second),
> > > but almost none for apache2, nginx and lighttpd.
> > >
> > > could this help to understand more about the performance
> > > differences?
> > >
> > >
> > > Thanks, Sascha
> > >
> > > > usally, for static files from a local fileseystem, one would
> > > > expect that nginx and lighttpd would outperform the apaches
> > > > remarcably...may be my observations have a common cause with
> > > > those of
> > > > http://lists.nongnu.org/archive/html/gluster-devel/2008-01/msg001
> > > >42.h tml ?
> > > >
> > > >
> > > > Thanks a lot, Sascha
> > > >
> > > > > are the test results same for multiple runs too?
> > > > >
> > > > > avati
> > > > >
> > > > > 2008/1/18, Sascha Ottolski <ottolski at web.de>:
> > > > > > Hi Folks,
> > > > > >
> > > > > > I'm wondering if anyone might have some general advices if I
> > > > > > miss something important in my test setup. I'm trying to
> > > > > > figure out how to tweak the configs to achieve the best
> > > > > > performance, but get result that feel strange to me. I will
> > > > > > post some numbers at a later point, but up to now what I
> > > > > > discovered is:
> > > > > >
> > > > > > - glusterfs without a namespace (1.3.0pre4) seems to be
> > > > > > significant faster than with namespace (tla patch-628)
> > > > > >
> > > > > > that seems to logical, at least I would expect some overhead
> > > > > > for the namespace.
> > > > > >
> > > > > > what i absolutely not understand is, how different the
> > > > > > webservers perform. i tested with
> > > > > >
> > > > > >     siege -f /tmp/siege-urls.txt.new -c100 -i -r50 -b
> > > > > >
> > > > > > with up to 3 sessions in parellel, each firing it's requests
> > > > > > to a seperate webserver (on seperate machines, of course).
> > > > > >
> > > > > > up to now my ranking by means of requests/per second is
> > > > > > something like
> > > > > >
> > > > > > 630 | apache
> > > > > > 430 | apache2 (worker)
> > > > > > 350 | nginx
> > > > > > 250 | lighttpd
> > > > > >
> > > > > > (with 1.3.0pre4 and no namespace, the best I've seen was
> > > > > > apache2 with about 900, apache still 750). I must admit that
> > > > > > up to now I did not compare it to local filesystem, but from
> > > > > > my past experiences with webservers I would expect nginx and
> > > > > > lighttpd way ahead of the apaches...
> > > > > >
> > > > > > Also, I exprimented a bit with different settings for
> > > > > > io-threads on the server (1, 2, 4, 8, and cache-size 64 or
> > > > > > 128MB), but that didn't seem to make much of a difference.
> > > > > > Same with read-ahead (which seems logical, as I test with
> > > > > > relatively small images).
> > > > > >
> > > > > > So far I did not try the booster. I use fuse-2.7.0-glfs7. I
> > > > > > also did not try the latest tla nor fuse-2.7.2-glfs8.
> > > > > >
> > > > > >
> > > > > > Thanks a lot for any pointer,
> > > > > >
> > > > > > Sascha
> > > > > >
> > > > > >
> > > > > > _______________________________________________
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> > > > > > Gluster-devel at nongnu.org
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> > > >
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>
>
>


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