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2004.02.09

YamhillとAMD64の互換性

Intel の 64 ビット拡張 の詳細が少しずつ出てきている。PC Watch の記事 が詳しい。
メモリ空間はリニアになるのはほぼ決まったらしい。妥当だろう。実際今の IA-32 も物理アドレスとしては 256GB までサポートしている。これで足りないケースというのは本当に一部だろう。
64 ビット拡張でより期待されているのは論理アドレス空間だ。もっとも高速なファイルの読み書きはメモリマップだが、現在の32ビット仮想アドレス空間ではメモリマップを使ってしまうと1~2GB程度のファイルにしかアクセスできない。論理アドレス空間が広がることによって、大きなファイルを扱うプログラムをより自然に、かつより高速にすることができる。なので、「40bit物理アドレスにマップするなら、それ以上の仮想アドレスは必要ない」という PC WATCH の意見には合意できないが、それでも AMD64 の 48ビット (256TB) は当面じゅうぶんだろう。

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