Intel 170 Servers User Manual

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

Figure 2.5.  Previous vs. Current Server 170 Performance

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.

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

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 Copyright IBM Corp. 2008