PCクラスタの作り方

PCクラスタ関係の資料(日本語) http://www.is.doshisha.ac.jp/~tomo/paper/2002/1116cluster.pd http://www.aist.go.jp/infobase/pcp/platform/uconf2/6_suzuki.pdf http://www.jstage.jst.go.jp/article/jspf/79/8/752/_pdf/-char/ja/ TFCC http://www.ieeetfcc.org/ 超並列計算研究会 http://www.is.doshisha.ac.jp/SMPP/ Beowulf http://www.debian.org/ports/beowulf/index.ja.html http://ja.wikipedia.org/wiki/Beowulf http://www.linux.or.jp/JF/JFdocs/Beowulf-HOWTO.html Continue reading PCクラスタの作り方


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.tkは評判が悪い

http://japan.cnet.com/news/sec/story/0,2000056024,20345072,00.htm 最近はtkドメインを無料で大安売りするところが現れてtkドメインの格がぐんと下がったのに加えてこれ。 なんだか悲しい。 Continue reading .tkは評判が悪い


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CRC

GZIPのRFC(RFC1952)にCRCのサンプルコードが載っていた。 http://tools.ietf.org/html/rfc1952 日本語訳があった。 http://www.futomi.com/lecture/japanese/rfc1952.html Continue reading CRC


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DBの速度

MovableTypeを入れているサーバにログインしたら、loadが13を超えていて驚いた。 psしてみると、MovableTypeのコメント処理用のCGIプロセスがいっぱいあって、どうやらコメントスパムにアタックされ中だったみたい。 10分ぐらいでおとなしくなったのでログインして見てみると、スパムコメントが35件入っていた。 意外と少ない。 そう言えば、ドライバが無いからHDDとの通信モードがDMAになっていないのだった。 早いとこマザーボードを買い換えようと思ってたところだったんだっけ。 それにしてもMobableTypeって重いな。 使ってるデータベースを変えたらどうだろう、と思ってDBMの速度について引いてみたりした。 結果はいろいろ。 http://www.syon.co.jp/syontech/tech017.html によると、特に設定しない場合ではどのDBMも100%の以上差は出て無かった(FreeBSD)。 http://www.jpring.net/jitaku/MovableType-mysql.html では5~10倍も差が出ている様子。 入っているエントリー数でも差がある様。 ( http://30smash.main.jp/mt/customize3/sqlite.html ) MT3.2ではBerkeleyDBでは再構築時に問題が起こっていたらしい。 ( http://bizcaz.com/archives/2006/08/02-065216.php ) それが負のイメージを喚起するのかどうかは分からないけど、巷ではBerkeleyDBが遅いという事になっているらしい。 http://nlogn.ath.cx/archives/000426.html 適切に設定すればMySQLやPostgreSQLなどは数倍早くなるらしいからその状態での話なのかもしれない。 http://www.sixapart.jp/movabletype/developers/naoya/archives/2004/08/movable_type_rd_1.html によると運用・保守性を求めるならMySQLやPostgreSQLを使うのがよろしいとのことだった。 データの数が多い大規模運営する場合はいろんな面でMySQLやPostgreSQLにしたほうがよいかも。 つまり小規模で、SQLとかを使いこなせてないとどれも変わらないということか。 と言うことにしておいたけど、中身を知っている人に聞くのが一番いいかも。 マザーボードを買い換えるのが先決ということは分かった。 http://takusato.net/article/bdb_oboegaki.html Continue reading DBの速度


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OpenCV

Intelが出しているオープンソースの画像処理ライブラリらしい。 ライセンスはBSD。 Windows、Linuxで使えるらしい。 FreeBSDでmakeしたひともいるみたい(MacOSXでも)。 速そう。 Continue reading OpenCV


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DRI

ちょっと興味ある http://dri.freedesktop.org/wiki/ Continue reading DRI


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php5のインストール手順 (Apache22)

packageからインストールすると依存関係がapache1.3になってしまうのでportsからインストールする。 config画面でAPACHEにチェックを入れるのを忘れずに。 IfModule dir_moduleにindex.php を登録する。 IfModule mime_moduleに”AddHandler php5-script .php” と書く。 Continue reading php5のインストール手順 (Apache22)


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user-pppの-natで静的NAT

pppの-natで静的NATをするにはppp.confに nat port proto targetIP:targetPort[-targetPort] aliasPort[-aliasPort] [remoteIP:remotePort[-remotePort]] と書く。 Continue reading user-pppの-natで静的NAT


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Google Readerが便利

何を今更と言われそう。 Continue reading Google Readerが便利


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ports/ports-mgmt

portupgradeがports/sysutilsから消えていた。 %make search key=portupgrade としてみると、ports/ports-mgmtの中にあることが分かった。 ports/ports-mgmtと言うのが新しくできたのでそこに移ったらしい。 Continue reading ports/ports-mgmt


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