It's not just a matter of having neighbors, and anyway > 0 neighbors is a performance problem. You'll note in the numbers below that the local machine had higher CPU use. I expect this was because it was getting more work done given the lower latency and higher throughput of non-virtualized IO.
On Tue, May 15, 2012 at 4:45 PM, S Ahmed <[email protected]> wrote: > any ideas how many c1.mediums might be on a given physical server? (rough > ideas...) > > On Fri, Dec 30, 2011 at 12:36 AM, Li Pi <[email protected]> wrote: > >> Yup. Virtualized IO pretty much explains it. >> >> On Thu, Dec 29, 2011 at 8:20 PM, Mark Kerzner <[email protected]> >> wrote: >> > Hi, >> > >> > I am running a small program to load about 1 million rows into HBase. It >> > takes 200 seconds on my dev machine, and 800 seconds on a c1.medium EC2 >> > machine. Both are running the same version of Ubuntu and the same version >> > of HBase. Everything is local on one machine in both cases. >> > >> > What could the difference between the two environments be? I did notice >> > that my local machine has higher CPU loads: >> > >> > hbase 64% >> > java (my app) 38% >> > hdfs 20% >> > >> > whereas the EC2 machine >> > hbase 47% >> > java (my app) 23% >> > hdfs 14% >> > >> > >> > Sincerely, >> > Mark >>
