Lessons learned from building an asynchronous filesystem component

@WyriHaximus

 Cees-Jan Kiewiet

  • @WyriHaximus
  • Phergie Team member
  • ReactPHP Team member
  • Sculpin Team member
  • Lead Software Engineer at 

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Files

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file_get_contents('HelloWorld.java');

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$filename = 'HelloWorld.java';
$handle = fopen($filename, 'r');
$contents = fread($handle, filesize($filename));
fclose($handle);

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function file_get_contents($filename)
{
    $handle = fopen($filename, 'r');
    $contents = fread($handle, filesize($filename));
    fclose($handle);
}

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$filename = 'HelloWorld.java';
$handle = fopen($filename, 'r');
$contents = '';
while (!feof($handle)) {
    $contents .= fread($handle, 4096);
}
fclose($handle);

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public class HelloWorld {
    public static void main(String[] args) {
        System.out.println("Hello World!");
    }
}

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public class HelloWorld {
    public static void main(String[] args) {
        System.out.println("Hello World!");
    }
}
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Directories

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  • .
  • ..
  • HelloWorld.java
  • PHP Antwerp.ug
  • vendor

@WyriHaximus

  • .
  • ..
  • HelloWorld.java
  • PHP Antwerp.ug
  • vendor

@WyriHaximus

  • .
  • ..
  • HelloWorld.java
  • PHP Antwerp.ug
  • vendor

@WyriHaximus

  • .
  • ..
  • HelloWorld.java
  • PHP Antwerp.ug
  • vendor

@WyriHaximus

  • .
  • ..
  • HelloWorld.java
  • PHP Antwerp.ug
  • vendor

@WyriHaximus

  • .
  • ..
  • HelloWorld.java
  • PHP Antwerp.ug
  • vendor

@WyriHaximus

@WyriHaximus

  • Directory
  • File
  • Symlink

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  • Directory: 0x4000
  • File
  • Symlink

@WyriHaximus

  • Directory: 0x4000
  • File: 0x8000
  • Symlink

@WyriHaximus

  • Directory: 0x4000
  • File: 0x8000
  • Symlink: 0xa000

@WyriHaximus

  • .
  • ..
  • HelloWorld.java
  • PHP Antwerp.ug
  • PHP Antwerp.ug

@WyriHaximus

Inodes

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An inode:


  • inode ID
  • size
  • device ID
  • user ID
  • group ID
  • mode
  • timestamps
  • flags
  • data blocks

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A file

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A directory

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A symlink

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Limits

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Software Limits

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ulimit

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Hardware limits

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Questions?

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https://slides.com/wyrihaximus/lessons-learned-from-building-an-asynchronous-filesystem-component

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