GDSX (Extended General Device Support) Manual

Operations and Support
Extended General Device Support (GDSX) Manual—529931-001
3-13
GDSX Configuration Parameters
If the specified trace file does not exist, the GDSX process creates and uses the file. If
the default subvolume already has a file with the name specified and the file has not
been opened by another process, the GDSX process opens the file. If the specified
trace file is in use by any other process, the GDSX process will not initiate the trace.
GDSX Configuration Parameters
GDSX uses configuration parameters to control memory allocation and numerous
aspects of the run-time environment. Some configuration parameters are called static,
because once their values are determined at process creation time, they cannot be
changed. The other configuration parameters are called dynamic because their values
can be changed after the process has been initialized.
See GDSX Configuration Parameters on page 2-46 for detailed information about the
static and dynamic configuration parameters for GDSX.
Setting Configuration Parameters
Other than assigning values to configuration parameters within USCODE, there are
three ways to set the configuration parameters. (For information on assigning values
to configuration parameters within USCODE, see GDSX Configuration Parameters on
page 2-46.)
1. Before running GDSX, use TACL PARAM commands to assign values to external
parameter names. This method may be used with static or dynamic parameters.
Use the external parameter names listed in the first column of Tables 2-2 and 2-3.
For example, to specify the restart time delay, enter the following command at a
TACL prompt:
> PARAM RESTARTTIME 10000
Or, to turn on the trace facility (give bit 11 of DEBUGFLAGS a value of 16), enter
the following command at a TACL prompt:
> PARAM DEBUGFLAGS 16
To turn on the trace facility (give bit 11 of DEBUGFLAGS a value of 16) and also
pool checking (give bit 14 of DEBUGFLAGS a value of 2), set DEBUGFLAGS
equal to 18 (16 + 2):
> PARAM DEBUGFLAGS 18
2. Use an SPI management application program to change parameter values. This
method can be used only with dynamic parameters.
3. Use SCF to change parameter values. This method may be used only with
dynamic parameters.
Caution. The PARAM DEBUGFLAGS command also turns off all the other flags in the bit-
encoded DEBUGFLAGS configuration parameter. See DEBUGFLAGS on page 2-54.