Last I heard, Barton's "Magic Number" was 4. But depending upon I/O load could go higher.
Davis, Larry wrote:
That was a very informative answer.
I know Barton Robinson at one point had used a ?MHz to MIPS ratio also, and I couldn't remember what that was.
Thanks.
Larry
-----Original Message----- From: Linux on 390 Port [mailto:[EMAIL PROTECTED] On Behalf Of Joseph Temple Sent: Friday, March 18, 2005 12:30 PM To: [email protected] Subject: Re: CPU Comparison
Larry, the conversion rate for Intel platforms to zSeries ranges from 3 MHz per MIPS to 30 MHz per MIPS depending on how much data you are pushing through the caches and out much serialization (context switches, locks, etc.). This is typically lower for the web servers and higher for the backend. Because zSeries capacity is almost always a mixed workload capacity the utilization peak and utilization variation on an interval by interval basis comes into play. This is because you have to configure each blade for its peak, but you configure zSeries for the composite peak which is almost always less or can be managed to be much less than the sum of the peaks. Because some workloads tend to saturate blades at lower utilization than zSeries the composite utilization peak is usually quite low.
Joe Temple Executive Architect Sr. Certified IT Specialist [EMAIL PROTECTED] 845-435-6301 295/6301 cell 914-706-5211 Home office 845-338-1448 Home 845-338-8794
"Davis, Larry" <[EMAIL PROTECTED] ielsenMedia.com> To Sent by: Linux on [email protected] 390 Port cc <[EMAIL PROTECTED] IST.EDU> Subject CPU Comparison
03/18/2005 11:42 AM
Please respond to Linux on 390 Port
I know that this has been asked in many different ways, but has anyone actually put together a comparison chart or list of CPU speeds for zSeries, I32, I64, and other processors.
I have a department that wants to have a group of dedicated Blades assigned to specific clients. We want to show a cost to Performance ratio for purchasing blades and scaling a zSeries system.
The application uses Java, in the backend to run the queries and retrieve the data, and Web servers to interface to a client and present the results.
Larry Davis, Senior Systems Engineer Nielsen Media Research 813-366-2380
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