April 2014
Intermediate to advanced
260 pages
5h
Japanese
Content preview from 実践 Android Developer Tools
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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.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.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.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.
10.3
MAT
（
Memory Analyzer Tool
）
171
図10-7 MAT概要画面
10.3.7
レポートを見る
MATが生成するレポートは、非常に細かい。このツールから得られる情報の形式や種類のイメー
ジをつかむためにサンプルレポートを取ってみよう。情報を見るのがいかに簡単かを示すために、
「Leak Suspects Report」のサンプルをお見せしよう（図10-8参照）。
このツールは、検出したProblem Suspect（問題が疑われる）クラスの1つ1 つについての情報を表
示している。メモリの消費状況（実際のバイト数とヒープ全体に対する割合）、メモリタイプについて
の情報（たとえば、Problem Suspect 1はバイト配列）、呼び出しが行われたコード内の位置の詳細な
どが表示されるので、クラスの何個のインスタンスがメモリ関連の問題の原因になっているかが非常
172
10
章 システムリソースを監視する
にはっきりとわかる。
このツールが報告してきた項目がすべて問題だというわけではないことに注意しよう。インスタ
ンス生成されて長時間参照が保持されていても不思議のないクラスはある。たとえば、Problem
Suspect 2 には、
java.lang.Class
のさまざまなインス ...
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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.