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11月 04

y-cruncherで円周率を求めてみる

Linux版を使用。(ファイル名にスペース使わないでよ…)
Corei7 860(Lynnfield)なので”x64 SSE4.1 ~ Ushio.out”を使用。この”Nagisa”,”Hina”,”Ushio”,”Kasumi”ってなんなんだろww

10M桁:18.01s
1G桁:600.8s

速いですね。Hexの方は16進ASCIIで出力なので、よほどHDD容量が気にならない限り無効にしていいと思います。
色々コンフィグできるのでCustom(3)を選びましょう。
1G桁でスワップ無しを選択したときに、自分の環境(メモリ8GB)だと28%で

Multiplication Failure:
Re-attempting with same parameters...
Second Attempt Failed: Possible memory error.
Terminating Program...

と異常終了してしまったのでスワップしたほうがいいかもしれません。なんでだろ。。空きメモリ十分なはずなんだけど。

ASCII出力だと1G桁でほぼ1GBです(当たり前か)。うーん、バイナリ出力とかできないのかな。Compress Outputってやつかな。
…試すのめんどくさいしいいか。

この円周率を使って、この中から任意の数列を検索するっていうのを考えてます。実はこれ小5の頃に思いついてて、もしかしたらプログラミングのきっかけだったのかも…。
(当時Cに挫折してなかったらなぁ…)

Permanent link to this article: http://lga128.nekobaka.net/2012/11/y-cruncher_pi/

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