What are the downsides of using performance improving translators ? There has to be some, or otherwise why not have them on by default? Thanks Pablo On Fri, Nov 20, 2009 at 3:50 PM, Raghavendra G <raghavendra.hg at gmail.com>wrote: > On Fri, Nov 20, 2009 at 10:35 AM, Paras Fadte <plfgoa at gmail.com> wrote: > > > Hi Vikas, > > > > Thanks for the response. > > > > I am having performance issues upon migration to gluster. Follwoing > > should explain the issue. > > > > There are scripts running which access data from the gluster mount > > point . Earlier NFS was used . With NFS the scripts seem to have no > > problem getting completed faster but when same scripts run accessing > > same data from gluster it runs about 3-4 times slower . Mostly the > > scripts do stat/unlinking/renaming operations on files. Number of > > files would be roughly 25k withe average file size 40KB . What can be > > done to increase the speed/performance ? > > > > If you are doing only operations like stat which modify metadata, without > reading or writing, stat-prefetch should be enough. If you are reading > files, you can try quick-read, since your file sizes happen to be smaller. > And if you are re-reading you can try io-cache. If you are writing to > files, > write-behind should help. > > > > > > Regarding stat-prefetch is the following usage correct ? > > > > volume afr > > type cluster/replicate > > subvolumes A B > > end-volume > > > > volume stat-prefetch > > type performance/stat-prefetch > > subvolumes afr > > end-volume > > > > yes. > > > > > > Thank you. > > > > -Paras > > > > > > On Fri, Nov 20, 2009 at 1:42 AM, Vikas Gorur <vikas at gluster.com> wrote: > > > Paras Fadte wrote: > > >> > > >> Hi, > > >> > > >> Which settings in AFR in gluster directly affects performance when > > >> there are lots of "ls" and "stat" calls made on files mounted using > > >> gluster? > > >> > > >> > > > > > > There isn't any setting in afr that can affect ls or stat performance. > > You > > > can load > > > the stat-prefetch translator above afr to increase ls/stat performance. > > > > > > Vikas > > > > > > > > _______________________________________________ > > Gluster-users mailing list > > Gluster-users at gluster.org > > http://gluster.org/cgi-bin/mailman/listinfo/gluster-users > > > > > > -- > Raghavendra G > > _______________________________________________ > Gluster-users mailing list > Gluster-users at gluster.org > http://gluster.org/cgi-bin/mailman/listinfo/gluster-users > >
