Solaris is a multi-threaded, scalable UNIXTM operating environment running on SPARC and Intel processors. It is self-adjusting to system load and demands minimal tuning. In some cases, however, tuning is necessary. This guide provides details about the officially supported kernel tuning options available for the Solaris environment.
The Solaris kernel is composed of a core portion, which is always loaded, and a number of loadable modules that are loaded as references are made to them. Many of the variables referred to in the kernel portion of this guide are in the core portion, but a few are located in loadable modules.
A key consideration in system tuning is that setting various system variables is often the least effective thing that can be done to improve performance. Changing the behavior of the application is generally the most effective tuning aid available. Adding more physical memory and balancing disk I/O patterns are also useful. In a few rare cases, changing one of the variables described in this guide will have a substantial effect on system performance.
sysdef -i reports on several system resource limits. Other parameters can be checked on a running system using adb -k :adb -k /dev/ksyms /dev/mem
parameter-name/D
^D (to exit)maxusers
ptys
RAM Tuneables
Disk I/O Tuneables
IPC Tuneables
File Descriptors
Misc Tuneables
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