![]() I wonder how we can get a definitive answer from Apple. When I do the same thing on the 10.6.2 system, toggling the hyper-threading status in the Processor pane (or from the command line) has no effect on Crafty whatsoever. When I run Crafty on the 10.5.8 system, toggling the hyper-threading status in the Processor pane has an immediate effect on Crafty's speed with 8 threads. It is measurably slower when hyper-threading is enabled. When set to use 8 threads, Crafty is quite sensitive to hyper-threading status. On each system I have identically compiled versions of the chess program Crafty. I have both a 10.5.8 and a 10.6.2 system on my Mac Pro 4,1. A check can be placed or removed, or cpu_ht can be set 1 or 0, but it seems to me hyper-threading is always enabled. ![]() ![]() I am now fairly certain that neither the Processor pref pane nor the command line method actually disable hyper-threading on 10.6 (using either 32 or 64-bit kernels). Quick CPU 4.7.0 66.09 MB Quick CPU is a program that was designed to fine-tune and monitor important CPU and System parameters such as CPU Temperature (Package and Core Temp), CPU Performance, Power, Voltage, Current, Core Parking, Frequency Scaling, System Memory, Turbo Boost, C-States, Speed Shift FIVR Control as well as making other.
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