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hostinfo(8) [osx man page]

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

hostinfo -- host information SYNOPSIS
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

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assign_cpu_to_pset(3)					     Library Functions Manual					     assign_cpu_to_pset(3)

assign_cpu_to_pset - Assigns a processor to a processor set LIBRARY
Pset Library (libpset.a) Mach Library (libmach.a) SYNOPSIS
#include <sys/types.h> #include <sys/processor.h> int assign_cpu_to_pset( unsigned long cpu, long pset_id , long option ); PARAMETERS
Processor or processors to assign to the specified processor set. Processor set identifier, which is returned by the create_pset function. Specifies a bit mask. Currently, only the ANY_CPU bit is supported. If this bit is set, the value specified by the cpu variable is the number of processors to be assigned to the specified processor set from the default processor set. If the ANY_CPU bit is not set, the value specified by the cpu variable is the mask of processors to be assigned to the processor set. DESCRIPTION
The assign_cpu_to_pset function removes processors from their current processor set and assigns them to the processor set specified by the pset_id variable. This function requires root privileges. If the ANY_CPU option is specified, the number of processors specified by the cpu variable are assigned from the default processor set to the processor set that is specified with the pset_id variable. If the specified number of processors are not available in the default pro- cessor set, an error is returned and no processors are assigned. If the ANY_CPU option is not set, the value specified by the cpu variable is a mask of processors to be assigned to the specified processor set. For example, if you specify a cpu value of 6, then processors 2 and 3 are assigned to the processor set. Note that processors are not required to start in slot 0 on some platforms. For example, you may see a three-processor system with proces- sors in slots 6, 7, and 8. The console assigns the master processor at power up, which is usually the processor in slot 0 if it is occu- pied. However, there is no requirement that slot 0 must be populated or that the master is the first processor on the bus. In the example of the three-processor (slots 6, 7, and 8) system, the master processor will be the one in slot 6. Processor assignments are logged in the /var/adm/wtmp file. RETURN VALUES
If the processor assignment is successful, the assign_cpu_to_pset function returns zero (0). If the assignment is unsuccessful, the func- tion returns a negative number. Use the print_pset_error function to print a message that describes the error. FILES
bind_to_cpu(3), create_pset(3), destroy_pset(3), assign_pid_to_pset(3), print_pset_error(3), processor_sets(4), pset_create(1) delim off assign_cpu_to_pset(3)

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