Chapter 13. Performance 305
To avoid the problems that might result, change the values for the timeout wait time and 
number of ports by editing the Windows registry:
/SM590000Change the value of the timeout wait time from 240 seconds to a lower number (valid 
values are 30 - 300 seconds). The key’s name is shown:
HKEY_Local_Machine\System\CurrentControlSet\services\Tcpip\Parameters\TcpTimedWaitDelay
/SM590000Increase the maximum port number from its default of 5000 to a higher number (valid 
values are 5000 - 65534). The key’s name is shown:
HKEY_Local_Machine\System\CurrentControlSet\services\Tcpip\Parameters\MaxUserPort
For more information about TcpTimedWaitDelay and MaxUserPort, see your Windows 
documentation.
Verify with your network personnel that you are setting the values that are appropriate for your 
environment correctly.
13.3.2  Factors that affect retrieval performance
Figure 13-2 shows the data retrieval performance testing, which is an illustration of the 
methodology that is used by the Content Manager OnDemand lab for its internal performance 
testing. On the client side (where the cTest program is), both throughput and response time 
are recorded. The definitions for throughput and response time are shown:
/SM590000Throughput: The amount of work that is performed over a period of time (How many 
transactions can the Content Manager OnDemand server (CMOD SERVER in the figure) 
run at the same time?)
/SM590000Response time: The time that is elapsed between when a request is submitted and when 
the response from that request is returned (How long does it take for a transaction to run?)
Maximizing performance is a balancing act between optimizing throughput (which is based on 
keeping the computing resources busy) and optimizing response times (which requires the 
computing resources to be available when they are needed). As the throughput increases, so 
does the response time.
Figure 13-2   Data retrieval performance testing
The concepts that are shown in Figure 13-2 are described for your reference.
The retrieval performance is mostly limited by the resources that are available to the Content 
Manager OnDemand server. 
Performance Tuning
CMOD SERVER
(Arssockd)
Same or different system ( z/OS, zLinux, AIX, IBM i, Windows)
cTest
(Java client) Induce load
cTest output
(Platform independent)
Transaction
Averages
Details
Tools: SMF , Omegamon
Strobe, db2pm
topas, iostat, vmstat
perfmon, netstat
Analysis: number of Apps, 
Ags, folders.. Number of 
users, resource availability, 
which DASD is the data on
What is happening Why is it happening
Throughput 
Response time
responses