Intel AS/400 RISC Server Model 7xx and 9/98 Model, Performance Highlights of Model 7xx Servers

2.4 Performance Highlights of Model 7xx Servers

7xx models were designed to accommodate a mixture of traditional “green screen” applications and more intensive “server” environments. Interactive features may be upgraded if additional interactive capacity is required. This is similar to disk, memory, or other features.

Each system is rated with a processor CPW which represents the relative performance (maximum capacity) of a processor feature running a commercial processing workload (CPW) in a client/server environment. Processor CPW is achievable when the commercial workload is not constrained by main storage or DASD.

Each system may have one of several interactive features. Each interactive feature has an interactive CPW associated with it. Interactive CPW represents the relative performance available to perform host-centric (5250) workloads. The amount of interactive capacity consumed will reduce the available processor capacity by the same amount. The following example will illustrate this performance capacity interplay:

Model 7xx and 9/98 Model 170

CPU Distribution vs. Interactive Utilization

		Model 7xx Processor FC 206B				(240 / 70 CPW)
	100						Announced
	80						Capacities
%							Stop Here!
CPU	60	Available for					available
Available	40	Client/Server			Knee		CFINT
							interactive
	20						34%
	0					29.2%
	0	20	40	60	80	100 (7/6)117

% of Published Interactive CPU

Applies to: Model 170 announced in 9/98 and ALL systems announced on or after 2/99

Figure 2.4. Model 7xx Utilization Example

At 110% of percent of the published interactive CPU, or 32.1% of total CPU, CFINT will use an additional 39.8% (approximate) of the total CPU, yielding an effective interactive CPU utilization of approximately 71.9%. This leaves approximately 28.1% of the total CPU available for client/server work. Note that the CPU is completely utilized once the interactive workload reaches about 34%. (CFINT would use approximately 66% CPU). At this saturation point, there is no CPU available for client/server.

IBM i 6.1 Performance Capabilities Reference - January/April/October 2008
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