HWPREFS(1) BSD General Commands Manual HWPREFS(1)
NAME
hwprefs -- inspect and control low-level system and processor parameters
SYNOPSIS
hwprefs [-v] [-h] [cpu_count={1..N}] [cpu_enable {1..N}] [cpu_disable {1..N}] [cpu_l2_cache={true, false}] [cpu_l3_cache={true, false}]
[cpu_nap={true, false}] [cpu_hwprefetch={0, 4, 8}] [cpu_nop_dsts={true, false}] [memctl_readbypass={true, false}] [os_class]
[os_type] [machine_type] [memory_size] [cpu_type] [cpu_freq] [cpu_bus_freq] [memctl_type] [ioctl_type"]
DESCRIPTION
hwprefs inspects and controls low-level system and processor parameters
-v verbose mode
-h display help message
cpu_count={1..N}
number of processors available for use by MacOS X
cpu_enable {1..N}
enable a specific processor
cpu_disable {1..N}
disable a specific processor
cpu_nap={true, false}
processor nap
cpu_l2_cache={true, false}
processor L2 cache
cpu_l3_cache={true, false}
processor L3 cache
cpu_hwprefetch={0, 4, 8}
prefetch engines used by hardware prefetcher (PPC970 only):
0 - all prefetch engines disabled, DST instructions treated as NOPs
4 - four automatic hardware prefetch engines, four used by DST instructions
8 - eight automatic hardware prefetch engines, DST instructions treated as NOPs
cpu_nop_dsts={true, false}
treat DST instructions as nops
memctl_readbypass={true, false}
memory controller (U3 only) read-bypass optimization (allows read commands to memory to bypass straight to read memory request
queue, saving a significant number of cycles)
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
Darwin December 21, 2005 Darwin