Perhaps your dataset can no longer be held in memory. Check iostats Le 19 févr. 2012 11:24, "Franc Carter" <franc.car...@sirca.org.au> a écrit :
> > I've been testing Cassandra - primarily looking at reads/second for our > fairly data model - one unique key with a row of columns that we always > request. I've now setup the cluster with with m1.large (2 cpus 8GB) > > I had loaded a months worth of data in and was doing random requests as a > torture test - and getting very nice results. I then loaded another days > worth of day and repeated the tests while the load was running - still good. > > I then started loading more days and at some point the performance dropped > by close to an order of magnitude ;-( > > Any ideas on what to look for ? > > thanks > > -- > > *Franc Carter* | Systems architect | Sirca Ltd > <marc.zianideferra...@sirca.org.au> > > franc.car...@sirca.org.au | www.sirca.org.au > > Tel: +61 2 9236 9118 > > Level 9, 80 Clarence St, Sydney NSW 2000 > > PO Box H58, Australia Square, Sydney NSW 1215 > >
