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

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.
..
HelloWorld.java
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vendor

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.
..
HelloWorld.java
PHP Antwerp.ug
vendor

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.
..
HelloWorld.java
PHP Antwerp.ug
vendor

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.
..
HelloWorld.java
PHP Antwerp.ug
vendor

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.
..
HelloWorld.java
PHP Antwerp.ug
vendor

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```
Directory
```
File
Symlink

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```
Directory: 0x4000
```
File
Symlink

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```
Directory: 0x4000
```
File: 0x8000
Symlink

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

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

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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

Slides:

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