IBM 170 Servers Manual page 104

Figure 6.6 provides insight into response time information regarding low-end System i models. There are
two key concepts that are displayed in the data in Figure 6.6. The first is that Accelerator for System i
models can provide substantially better response times than previous models for a single or many users.
The 600 CPW accelerated to 3100 CPW reduces the response time by 5 times while the 1200 CPW
accelerated to 3800 CPW reduces the response time by 2.5 times. The second idea to note is that the
presence of L3 cache has little effect on the response time of a single user. Of course there are benefits of
L3 cache, however, the absence of L3 cache does not imply poorer performance with regards to response
time.
Trade JDBC Response Tim e (1 User)
0.09
0.08
0.07
0.06
0.05
0.04
0.03
0.02
0.01
0
500 600 1000 1200 2400 3100 3300 3800
Figure 6.6 - Accelerator for System i
performance data - Single user response time
comparison (WAS 6.0 running Trade 6).
IBM i 6.1 Performance Capabilities Reference - January/April/October 2008
©
Copyright IBM Corp. 2008
CPW Rating
Chapter 6 - Web Server and WebSphere
New Models
Accelerator
Old Models
104