I wonder how we can get a definitive answer from Apple. Move your QuickBooks Desktop file to QuickBooks Online. Download a trial of QuickBooks Desktop Enterprise. Ask questions, get answers, and join our large community of QuickBooks users. QuickBooks DesktopQuickBooks Desktop Plus. If you have more than one user working on QuickBooks, you can. 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. Step 3: Download and install QuickBooks Desktop for Mac. 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).
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