| From: | Mike Bresnahan <mike(dot)bresnahan(at)bestbuy(dot)com> |
|---|---|
| To: | pgsql-general(at)postgresql(dot)org |
| Subject: | Re: Amazon EC2 CPU Utilization |
| Date: | 2010-01-27 22:37:49 |
| Message-ID: | loom.20100127T233502-790@post.gmane.org |
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| 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?
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