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

[Angel]

Hi Sascha

I have a few ideas you can try to figure out a bit more wahts happening


Maybe there is locking on the apache as it traverses files.

Asking the devels:
Is locking implemented on files (posix-locks over posix-storage) or does unify locks also files on namespace?
Are there any diferences on run with / without, posix-locks? Show the trace xlator locking activity?

You said there are over 1700 files , are them php code and includes? How many files you estimate are implicated 
on php script execution? Maybe you are running out of file descriptors on some node..


Try run a local only scenary without client/server, you can test cpu usage againts plain direct access
or access via gluster mount point

Also you ca trigger php script on cmd line to avoid apache singularities and focus un glusterfs vs plain filesystem 

This also applies in the network scenary, Apache vs non-Apache access would be very informational is they differ a lot
 
Regards, Angel

El Sábado, 19 de Enero de 2008 Sascha Ottolski escribió:
> 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?
> 
> 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/msg00142.html ?
> 
> 
> 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
> > >
> > >
> > > _______________________________________________
> > > Gluster-devel mailing list
> > > Gluster-devel at nongnu.org
> > > http://lists.nongnu.org/mailman/listinfo/gluster-devel
> 
> 
> 
> 
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