hostinfo — host
information
The hostinfo command displays information
about the host system on which the command is executing. The output includes
a kernel version description, processor configuration data, available
physical memory, and various scheduling statistics.
- Mach kernel version:
- The version string compiled into the kernel executing on the host
system.
- Processor Configuration:
- The maximum possible processors for which the kernel is configured,
followed by the number of physical and logical processors available.
Note: on Intel architectures, physical processors are referred
to as cores, and logical processors are referred to as hardware threads;
there may be multiple logical processors per core and multiple cores per
processor package. This command does not report the number of processor
packages.
- Processor type:
- The host's processor type and subtype.
- Processor active:
- A list of active processors on the host system. Active processors are
members of a processor set and are ready to dispatch threads. On a single
processor system, the active processor, is processor 0.
- Primary memory available:
- The amount of physical memory that is configured for use on the host
system.
- Default processor set:
- Displays the number of tasks currently assigned to the host processor set,
the number of threads currently assigned to the host processor set, and
the number of processors included in the host processor set.
- Load average:
- Measures the average number of threads in the run queue.
- Mach factor:
- A variant of the load average which measures the processing resources
available to a new thread. Mach factor is based on the number of CPUs
divided by (1 + the number of runnablethreads) or the number of CPUs minus
the number of runnable threads when the number of runnable threads is less
than the number of CPUs. The closer the Mach factor value is to zero, the
higher the load. On an idle system with a fixed number of active
processors, the mach factor will be equal to the number of CPUs.