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2007-01-19

_ 送信の高速化(Win32)

どうもWin32版のメール送信が遅い気がしていた(他の人からもつっこまれた)ので調べていたら、「Windows Sockets API プログラムを使用して TCP サーバーへデータをコピーした場合、パフォーマンスが低下する」という、そのものずばりの情報を会社の人からいただいた。

実際に setsockopt() で SO_SNDBUF を8192(デフォルト)から32768に増やしてみたら、体感できるほどに速くなった。実際は一度に送出するデータサイズ+1(8193)でも十分だが、余裕を見て指定した。以前は WSAEWOULDBLOCK が send() の呼び出しに対して10回に9回くらい発生していたのが、この修正で3,4回に1回程度まで減った(本来なら送信が可能な場合のみ呼ばれるはずだが、 GLib の問題なのかうまくいっていない)。

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