March 2017
Intermediate to advanced
364 pages
9h 45m
Japanese
Content preview from 初めてのPHP
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14.4
スケーリングはゆくゆく考える
271
14.4
スケーリングはゆくゆく考える
大規模システムの構築や実行に興味を持っているソフトウェアエンジニアや企業の人たちと話
をすると、「スケーリングできるか」や「このシステムはスケーラブルか」といった質問をよく受け
ます。彼らは、（時には不正確に）このシステムが多くの人が使う大規模システムになった場合の
対応を知りたいのです。利用者が 3 人のときに高速な Web サイトは、利用者が 3,000 人になったら
遅くなるでしょうか。300 万人になったらどうでしょうか。
スケーラブルなシステムを構築するための初心者のプログラマへ贈る、私の最善のアドバイス
は、「今のところは心配しない」です。負荷が高くなっても問題がほとんどないことを事前に保証
しておくよりも、最初は軽い負荷で（ほとんど）正常に機能させることの方がずっと重要です。
大規模システムで
PHP
を使う
PHP は簡単に始められるので、無数の小規模Web サイトで使用されています。それば
かりでなく、とても巨大なシステムにも対応しています。Facebook は、独自バージョンの
PHP エンジン HHVM（http://hhvm.com/）を構築して PHP コードを実行し、さらにインフラ
を効率化しています。Baidu、Wikipedia、Etsy も HHVM エンジンを使用しています。
さらに、アプリケーションでパフォーマンス問題が現れたとき、おそらく PHP コードは最大の
問題ではありません。多くのことがアプリケーションのパフォーマンスに影響します。実行に数秒 ...
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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.