CICS Transaction Gateway V5 The WebSphere ... - IBM Redbooks

7.2.2 Defining CICS TG configuration parameters
There are several CICS TG configuration parameters that can be modified. We
modified these by editing the CTG.INI file. You can use the X-Windows ctgcfg
tool if you have X-Windows.
Note: The CICS TG Configuration Tool utility ctgcfg is supplied with the CICS
TG for z/OS and can be used on z/OS. However, you will need to be familiar
with X-Windows and have configured an X client to be able to use this utility. If
you are not familiar with UNIX and X-Windows, you could simply edit the
CTG.INI file in the /usr/lpp/ctg500/ctg/bin directory.
Another method is to enter ctgcfg -PLAT ZOS on a Windows workstation that
has the CICS TG installed. This uses the CICS TG for Windows configuration
utility to create z/OS configuration files. Once you’ve saved the CTG.INI file,
you simply FTP it to the location in your CICSCLI variable.
Changes to any of these parameters requires a stop and restart of the CICS TG
before they will take effect. The following is a list of the most important
configuration parameters, along with the values we used:
► initconnect=10
This is the initial number of connection manager threads allocated at startup.
Set this to the “normal” number of clients you expect to support.
► initworker=10
This is the initial number of worker threads allocated at startup. Set this to the
initial number of connection manager threads.
► maxconnect=100
This is the maximum number of connection manager threads. This limits the
maximum number of remote Java clients that can connect to the CICS TG
through one of the protocol handlers. Set this to the maximum number of
clients you need to support, but also make sure it is greater than or equal to
maxworker.
► maxworker=100
This is the maximum number of worker threads, which limits the maximum
number of parallel ECI request the CICS TG can process. It should be:
– Less than or equal to maxconnect
– Less than or equal to the RECEIVECOUNT set in the CICS sessions
definition
– Less than or equal to 100, since this is the maximum number of EXCI
pipes that any z/OS address space can allocate
Chapter 7. TCP connections to the Gateway daemon on z/OS 153