September 2011
Intermediate to advanced
612 pages
15h 48m
Japanese
Content preview from Making Software ―エビデンスが変えるソフトウェア開発
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251
戦闘へ
戦闘へ
いかなる戦術も眼前の敵には無力だ。
―
Helmuth von Moltke the Elder
私が調べたシステムの主要な属性を表
15-1
に示します。私が集めた品質メトリクスはおおまかに、
ファイル構成、コード構造、コードスタイル、プリプロセシング、データ構成に分類できます。
1
つの
数値でメトリックを表すのが容易なときは、
4
つのシステムのそれぞれについての値を表にして、左側
にその値は高い（↑）のが理想的、低い（↓）のが理想的、特定の値に近い（たとえば、≅
1
）のが理想
的、のどれであるかを示してあります。それ以外の場合は、各値の分布をよく見て、図
15-3
のような、
いわゆるローソク図を用います。この図の各要素には以下の
5
つの値が載っています。
●
下端の縦線の一番下は最小値
●
下側の箱の下端は第
1
四分位数（
25%
）
●
箱内の横線はメジアン（
50%
、上半分と下半分の値を分ける値）
●
上側の箱の上端は第
3
四分位数（
75%
）
●
上側の縦線の一番上は最大値
●
ひし形は平均値
グラフの範囲外に最小値や最大値がある場合は、点線でそのことを示し、その値を数字で記してあり
ます。
表
15-1
4
つのシステムにおける主要メトリクス
メトリック
FreeBSD Linux Solaris WRK
バージョン
HEAD 2006-09-18 2.6.18.8-0.5 2007-08-28 1.2
コンフィギュレーション
i386 AMD64,
SPARC64
AMD64 Sun4v, Sun4u, SPARC
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.