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2007-04-13

_ ファイル移動・コピーの最適化

Win32版でどうもメッセージの移動などが遅いのが気になったので、コードを調べているといくつか最適化できそうなところが見つかった。

Win32ではrename()に移動先のファイルを上書きするためのラッパーをかましていたが、GLib 2.9.1 以降で g_rename() の仕様が変更されたためこれが不要になっていた。これによって、大量のメッセージの移動が多少速くなった気がする。

また、ファイルのコピーを fread()/fwrite() で行っていたが、これを read()/write() で書き直すことでベンチマークでは数倍位速くなった。これはUnix/Win32共通。ちなみにWin32ではCopyFile()よりこっちのほうが速かった。

若干大きな変更なので、RC直前ということで入れるかどうか迷ったが、テストの結果問題ないだろうということで入れることにした。

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