Re: Amazon EC2 CPU Utilization

Mike Bresnahan <mike.bresnahan@bestbuy.com>

From: Mike Bresnahan <mike.bresnahan@bestbuy.com>

To: pgsql-general@postgresql.org

Date: 2010-01-27T22:37:49Z

Lists: pgsql-bugs, pgsql-general

Jim Mlodgenski <jimmy76 <at> gmail.com> writes:
> I have seen behavior like this in the past on EC2. I believe your bottleneck
may be pulling the data out of cache. I benchmarked this a while back and found
that memory speeds are not much faster than disk speeds on EC2. I am not sure if
that is true of Xen in general or if its just limited to the cloud.  

When the CPU is waiting for a memory read, are the CPU cycles not charged to the
currently running process?