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Hyper-Threading対応のOS

Pentium4のHyper-Threadingに対応しているのはWindows XPとLinux、FreeBSDだ。
Linuxの場合普通にディストリビューションをインストールするだけで、SMP対応のkernelが入るらしい。HTが2CPUに見えてるかどうかは以下のコマンドで調べることができる。

$ cat /proc/cpuinfo

うまくいかない場合は、acpismp=forceをkernelオプションとして渡せばよい。

FreeBSDの場合R5.1以降は、generic kernelのままでも Hyper-Threadingが利用可能ならしい。
4.8などに導入する場合はkernelを再コンパイルしてSMPとHTをONにして上げる必要あり。

ちなみに、宮原先生いわく「漢は黙ってSMP」なんだそうだ。ええ、うちのマシンはPA-RISCもPentiumIIIもSMPです。
(しかし、サーバはシングルだったりするが....)

http://www.itmedia.co.jp/enterprise/0211/18/n23.html
FAQ: FreeBSDその他 SMP/HTTを利用したい
http://h50146.www5.hp.com/products/software/oe/bsd/support/faq_freebsd/freebsd_1.html

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