4 Kernel Tuning Parameters

Solaris kernel tuning parameters define the amount of shared memory and semaphores available to programs such as SNAP-IX running on a Solaris computer.

Normally, the default values for these parameters are suitable for typical SNAP-IX configurations. In some cases, it may be necessary to tune some of these parameters, particularly if many users of SNAP-IX programs are on the Solaris computer at the same time. Tuning should only be done once SNAP-IX has been successfully installed and started using the defaults. The parameters should be set to large enough values to accommodate both the SNAP-IX requirements and the requirements of any other programs on the system.

If you need to change any of these values, refer to your Solaris documentation for information about how to set them.

Following are the tuning parameters and their recommended values:

shminfo_shmmni

1 + (number of concurrent copies of the 3270 emulation program) + (total number of sessions configured for HLLAPI)

seminfo_semmni

(2 × number of concurrent copies of the 3270 emulation program) + (total number of sessions configured for HLLAPI)

seminfo_semmns

(2 × number of concurrent copies of the 3270 emulation program) + (2 × total number of sessions configured for HLLAPI)

seminfo_semmap

Half the value of shminfo_semmns

seminfo_semmnu

(2 × number of concurrent copies of the 3270 emulation program) + (total number of sessions configured for HLLAPI) + (number of concurrent CPI-C applications)

shminfo_shmseg

2 + (maximum number of sessions configured for HLLAPI for a single user)