Re: Physical CPU? or multicore?
- From: Amar Kumar Padhi <amar.padhi@xxxxxxxxx>
- To: <niall.litchfield@xxxxxxxxx>
- Date: Wed, 29 Apr 2009 08:47:28 +0400 (GST)
Hi Niall, more info. We actually had this need to compare the single and
multi-cores for moving our existing 100s of servers to new ones. Yes today
options are limited to multi-cores, but we still needed to know that keeping
all other hardware aspects somewhat constant, how many cores match a single
core. I also do infrastructure recommendation and that is the reason for me
getting into this.
It has worked well as we were able to draw lines, put numbers instead of vague
guesswork and recommend optimal standards. Yes, we looked at the changing
attributes of the Cpu and other hardware (no VM for production though) , that
also accounts for the final recommendation.
All this may not be required for a new shop starting with multi-cores only, in
such case benchmarking the application on the cores itself will serve the
purpose. For the clients I work with, most still continue to run old boxes and
the comparison will keep coming up.
Thanks!
Amar
Www.amar-Padhi.com
-original message-
Subject: Re: Physical CPU? or multicore?
From: "Niall Litchfield" <niall.litchfield@xxxxxxxxx>
Date: 28-04-2009 22:53
I'm curious as to how you arrived at this, like at least the web links
if not the internal testing, though why you would do internal testing
just of the CPU I'm not sure.
AFAIK you cannot buy any system that has single nehalem cores. That
is, you can only buy that CPU in multi-core variants. I believe the
same is true of other multi-core CPUs that are available today. (as an
aside I believe that "standard" CPUs today are multicore anyway but I
digress).
So I'm just unsure what you compared with what and how.
Having said all that the CPU is not the unit of measurement I am not
concerned with. How many IOPS against given storage (or if really
pushed Java/C# TPS) would be my measurement, and it would be on a
per-server basis.
cheers
Niall
--
Niall Litchfield
Oracle DBA
http://www.orawin.info
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