Memory part 5: What programmers can do
October 23, 2007 This article was contributed by Ulrich Drepper [Editor's note: welcome to part 5 of Ulrich Drepper's "What every programmer should know about memory". This part is the first half of section 6, which discusses what programmers can do to improve the memory performance of their code. Part 1, part 2, part 3, and part 4 remain online for those who have not yet read them.] 6 What Progra
[Linux][Android] Analyzing Memory Usage.
First of all, I am going to avoid methods that using ‘Shell’ command, because in embedded environment(embedded linux like Android), we cannot expect full-functioned shell (ex. bash, tcsh etc). Before talking about memory analysis, let’s look over fundamental concepts related with memory. (This article is written based on Kernel 2.6.29) There are 4 type of memory. private clean, private dirty, shar
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ELC: How much memory are applications really using?
ELC: How much memory are applications really using? Anybody who has tried to figure out why a Linux system is running short of memory can attest that the memory usage information made available by the kernel is, at best, difficult to use. Matt Mackall has recently been working on a set of patches aimed at improving this situation. Given the constraints imposed by embedded Linux systems, it is not
革命の日々！ PSSとUSS
http://journal.mycom.co.jp/news/2008/04/18/007/index.html プロセス管理機構も見直され、プロセスごとのメモリ使用量をかんたんに測定できる機能が追加された。カーネル2.6.25では、プロセスが使用するページに対応する物理ページ配置をプロセスごとに/proc/$PID/pagemapsとして作成、これを他のプロセスと比較することで共有するページを判別できる。共有ページを共有しているプロセスの数で除した数値を持つ「proportional set size (PSS)」と、共有されていないページをカウントした「unique set size (USS)」という2つの統計値も新設された。 この説明はへんだ。 カーネル内にUSSという統計値は存在しない。また、pagemapsというファイルは存在しない（pagemapだ） pagemapはページ
Memory part 2: CPU caches
October 1, 2007 This article was contributed by Ulrich Drepper [Editor's note: This is the second installment in Ulrich Drepper's "What every programmer should know about memory" document. Those who have not read the first part will likely want to start there. This is good stuff, and we once again thank Ulrich for allowing us to publish it. One quick request: in a document of this length there are
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