Archive for June 2009
Breaking your mac with the hwprefs command
The hwprefs(1) command shows you low level information about your Mac, It’s CPU, the Memory and OS X. It also lets you control low level CPU and memory options on your mac. You can also do things like disable a CPU and disable the L1/L2/L3 CPU caches. Similar to psradm(1) in Solaris / sparc64. Be warned!
hwprefs 4.5.0
usage: hwprefs [options] parameter
hwprefs [options] parameter=value
OPTIONS
-v verbose mode
-h display this help message
PROCESSOR COUNT
cpu_count {1..N} number of physical processors available to MacOS X
cpu_enable {1..N} enable a specific processor
cpu_disable {1..N} disable a specific processor
cpu_ht {true, false} processor hyperthreading
PROCESSOR CACHES
cpu_l1_cache {true, false} processor l1 cache
cpu_l2_cache {true, false} processor l2 cache
cpu_l3_cache {true, false} processor l3 cache
POWER SAVING
cpu_nap {true, false} processor nap
INFO AND STATUS (READ ONLY)
os_class displays OS class {Cheetah, Puma, Jaguar, Smeagol, Panther, Tiger}
os_type displays operating system type
machine_type displays machine type
memory_size displays system memory
cpu_type displays processor type and version
cpu_freq displays processor clock frequency
cpu_bus_freq displays processor bus frequency
memctl_type displays memory controller type
ioctl_type displays io controller type
hwprefs 4.5.0 usage: hwprefs [options] parameter hwprefs [options] parameter=value OPTIONS -v verbose mode -h display this help message PROCESSOR COUNT cpu_count {1..N} number of physical processors available to MacOS X cpu_enable {1..N} enable a specific processor cpu_disable {1..N} disable a specific processor cpu_ht {true, false} processor hyperthreading PROCESSOR CACHES cpu_l1_cache {true, false} processor l1 cache cpu_l2_cache {true, false} processor l2 cache cpu_l3_cache {true, false} processor l3 cache POWER SAVING cpu_nap {true, false} processor nap INFO AND STATUS (READ ONLY) os_class displays OS class {Cheetah, Puma, Jaguar, Smeagol, Panther, Tiger} os_type displays operating system type machine_type displays machine type memory_size displays system memory cpu_type displays processor type and version cpu_freq displays processor clock frequency cpu_bus_freq displays processor bus frequency memctl_type displays memory controller type ioctl_type displays io controller type
