hostinfo(8) [mojave man page]

hostinfo(8)						    BSD System Manager's Manual 					       hostinfo(8)

NAME

     hostinfo -- host information

SYNOPSIS

     hostinfo

DESCRIPTION

     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.

OPTIONS

     There are no options.

DISPLAY

	   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 avail-
	   able.

	   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 proces-
	   sor 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.

SEE ALSO

     sysctl(8)

Mac OS X							 October 30, 2003							  Mac OS X

processor_sets(4)					     Kernel Interfaces Manual						 processor_sets(4)

NAME

       processor_sets - Collections of processors

DESCRIPTION

       A  processor  set  is  a collection of processors.  When a processor set is first created, it does not contain any processors.  You can add
       processors to a processor set, remove processors from a processor set, and also destroy the processor set.  In  addition,  you  can  assign
       specific processes to a processor set.

       When  the  system  is  booted, all its processors are assigned to the default processor set.  Each processor in a system can be a member of
       only one processor set at one time.

       In addition, when you create a process, it is assigned to a processor set.  Unless you indicate a specific  processor  set,  a  process	is
       assigned  to  the  default  processor  set.   A process can execute only on an processor that is included in the processor set to which the
       process is assigned.  If you assign a process to an empty processor set, it will not execute until a processor is assigned to the processor
       set or until the process is assigned to another processor set.

       Use the pset_create command or the create_pset function to create a processor set.  When you first create a processor set, it does not con-
       tain any processors.

       Use the pset_assign_cpu command or the assign_cpu_to_pset function to assign processors to a specific processor set.   When  you  assign  a
       processor to a specific processor set, the processor is removed from its current processor set.

       Use the pset_destroy command or the destroy_pset function to destroy a processor set.   Processors that belong to a destroyed processor set
       are assigned to the default processor set.

       Use the pset_assign_pid command or the assign_pid_to_pset function to assign a process to a specific processor set.  In addition,  you  can
       request	that a process has exclusive access to a processor set.  If a process has exclusive access to a processor set, no other process is
       able to use that processor set.	If a process has exclusive access to a processor set, that access will be cleared automatically  when  the
       process exits.  Note that if a process is already assigned to a processor set, a request for exclusive access to that processor set will be
       denied.

       Use the pset_info command to display the status of each processor set on the system as well as the status of each processor.

       You must be root to create and destroy processor sets and to assign a processor to a processor set.  Processor set creation and destruction
       and processor assignments to processor sets are logged in the /var/adm/wtmp file.

FILES

       /var/adm/wtmp

RELATED INFORMATION

       Commands: pset_create(1), pset_destroy(1), pset_info(1), pset_assign_pid(1), pset_assign_cpu(1), runon(1), psrinfo(1), psradm(8)

       Functions: assign_pid_to_pset(3), assign_cpu_to_pset(3), create_pset(3), destroy_pset(3) delim off

																 processor_sets(4)