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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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psradm(8)						      System Manager's Manual							 psradm(8)

psradm, offline, online - Stops and starts processors in a multiprocessor system SYNOPSIS
/usr/sbin/psradm -f [-v] [[-a] [processor_id...]] /usr/sbin/psradm -n [-v] [[-a] [processor_id...]] /usr/sbin/online [-v] [processor_id...] /usr/sbin/offline [-v] [processor_id...] OPTIONS
The following options apply only to the psradm command: Specifies that all the processors except the master processor be put off line or on line. Puts the specified processor off line. Puts the specified processor on line. The following option applies to all forms of the command: Displays a message about the status of the operation performed on each processor. DESCRIPTION
On a multiprocessor system, the psradm command puts one or more processors off line (stops a processor) or on line (starts a processor). The processor_id variable specifies an integer that uniquely identifies a processor. Use the psrinfo command to display processor identi- fication numbers. The offline command puts one or more processors off line (stops a processor). If no processors are specified, all processors that are on line are stopped except the master processor. The online command puts one or more processors on line (starts a processor). If no processors are specified, all processors that are off line are started. Note that you cannot use these commands to start or stop the master processor in a multiprocessor system. You must be the root user to use this command. The /var/adm/wtmp file contains information about successful processor state transitions. RESTRICTION
Do not use the psradm command to disable CPUs when benchmarking performance, because the command does not provide an accurate reflection of the performance of a system that actually has fewer CPUs. Accurate performance results are obtained only when you disable the CPUs at the SRM console command level. EXAMPLES
The following command puts processors 2 and 3 off line: # psradm -f 2 3 The following command puts all the processors on line: # psradm -n -a The following command puts all processors on line: # online -v FILES
Commands: pset_info(1), psrinfo(1) Files: processor_sets(4) psradm(8)
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