Intel 170 Servers, AS/400 RISC Server, 7xx Servers Performance Highlights of Custom Server Models

The next chart shows the performance capacity of the current and previous Model 170 servers.

Previous vs. Current AS/400e server 170 Performance

	1200
														1090
	1000
Values	800			Previous *						Current
	600
CPW												460	460
	400				319	319
	200			210							220
			114							115
		73				67							70	70
			23	29	40			50	73		30	50
	0	16					15		20	25
		2159	2160	2164	2176	2183	2289		2290	2291	2292	2385	2386	2388

Interactive

Processor

* Unconstrained V4R2 rates

Figure 2.5. Previous vs. Current Server 170 Performance

2.6 Performance Highlights of Custom Server Models

Custom server models were available in releases V4R1 through V4R3. They interact with batch and interactive workloads similar to the server models but the degree of interaction and priority of workloads is different, and the knee of the curve for workload interaction is at a different point. When the interactive workload exceeds approximately 6/7 of the maximum interactive CPW (the knee of the curve), the client/server processing performance of the system becomes increasingly impacted. Once the interactive workload reaches the maximum interactive CPW value, all the CPU cycles are being used and there is no

capacity available for handling client/server tasks.

2.7 Additional Server Considerations

It is recommended that the System Operator job run at runpty(9) or less. This is because the possibility exists that runaway interactive jobs will force server/interactive overhead to their maximum. At this point it is difficult to initiate a new job and one would need to be able to work with jobs to hold or cancel runaway jobs.

You should monitor the interactive activity closely. To do this take advantage of PM/400 or else run Collection Services nearly continuously and query monitor data base each day for high interactive use

IBM i 6.1 Performance Capabilities Reference - January/April/October 2008
© Copyright IBM Corp. 2008	Chapter 2 - Server Performance Behavior	24