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Oracle® Solaris 11.4 Tunable Parameters Reference Manual

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Updated: August 2021

Viewing Oracle Solaris System Configuration Information

Several tools are available to examine system configuration information. Some tools require superuser privilege. Other tools can be run by a non-privileged user. Every structure and data item can be examined with the kernel debugger by using mdb on a running system or by booting under kmdb.

For more information, see the mdb(1) or kmdb(1) man page.

sysdef Command

The sysdef command provides the values of memory and process resource limits, and portions of the tune and v structures. For example, the sysdef "Tunable Parameters" section from a SPARC T3-4 system with 500 GB of memory is as follows:

2206203904      maximum memory allowed in buffer cache (bufhwm)
65546           maximum number of processes (v.v_proc)
99              maximum global priority in sys class (MAXCLSYSPRI)
65541           maximum processes per user id (v.v_maxup)
30              auto update time limit in seconds (NAUTOUP)
25              page stealing low water mark (GPGSLO)
1               fsflush run rate (FSFLUSHR)
25              minimum resident memory for avoiding deadlock (MINARMEM)
25              minimum swapable memory for avoiding deadlock (MINASMEM)

For more information, see the sysdef(8) man page.

kstat Utility

kstats are data structures maintained by various kernel subsystems and drivers. They provide a mechanism for exporting data from the kernel to user programs without requiring that the program read kernel memory or have superuser privilege. For more information, see the kstat(8) and the kstat(3KSTAT) man pages.

kstat2 Utility

The kstat2 utility shows values of kernel statistics (kstats). If you do not know the full name of the statistic you want, you can use a shell glob pattern or Perl Compatible Regular expression (PCRE). With options, you can show multiple statistic values over specified increments of time, and show the timestamp for each value, for example. For more information and examples, see the kstat2(8) man page. See also Oracle Solaris Observability Tools and Troubleshooting IPsec and IKE Semantic Errors in Securing the Network in Oracle Solaris 11.4.

Oracle Solaris Observability Tools

The Oracle Solaris System Web Interface shows kstats and many other statistics in a graphical form. The Observability Tools also shows relationships among statistics and shows values over time to help you diagnose problems with the system. For more information, see Using Oracle Solaris 11.4 StatsStore and System Web Interface.