Node.js Core Dump Resurrector

by mmarchini 7 years ago

GNU/Linux • xterm-256color • zsh 408 views

See: https://github.com/mmarchini/node/tree/necromancer/lldb_v8

lldb_v8 commands:

v8 load: Bootstaps the Postmortem Host, copying memory from the core dump into the host process (not required, will be run by the other commands if the host is not running)
v8 stack: Prints the stack trace using Isolate::PrintStack()
v8 print <addr>: Prints the content of an object using Object::Print()

More recordings by mmarchini

Browse all

libstapsdt Python Wrapper + eBPF/bcc trace 1:06

by mmarchini 8 years ago

git clean -xdf always dirty 1:07

by mmarchini 5 years ago

llnode findjsobjects detailed output 0:38

by mmarchini 8 years ago

libstapsdt NodeJS Wrapper + eBPF/bcc trace 1:09

by mmarchini 8 years ago

https://asciinema.org/a/227038

Copied!

Append ?t=30 to start the playback at 30s, ?t=3:20 to start the playback at 3m 20s.

See sharing docs for more link customization options.

Embed as image link

Use snippets below to display a preview image linking to this recording.
Ideal for places where scripts are not allowed, such as project README files.

HTML:

<a href="https://asciinema.org/a/227038" target="_blank"><img src="https://asciinema.org/a/227038.svg" /></a>

Copied!

Markdown:

[![asciicast](https://asciinema.org/a/227038.svg)](https://asciinema.org/a/227038)

Copied!

Embed the player

If you're embedding on your own page or on a site which permits script tags, you can use the full player widget:

<script src="https://asciinema.org/a/227038.js" id="asciicast-227038" async="true"></script>

Copied!

Paste the above script tag where you want the player to be displayed on your page.

See embedding docs for more player customization options.

You can download this recording in asciicast v2 format, as a .cast file.

Download

Replay in terminal

You can replay the downloaded recording in your terminal using the asciinema play command:

asciinema play 227038.cast

Copied!

If you don't have asciinema CLI installed then see installation instructions.

Use with stand-alone player on your website

Download asciinema player from the releases page (you only need .js and .css file), then use it like this:

<!DOCTYPE html>
<html>
<head>
  <link rel="stylesheet" type="text/css" href="/assets/asciinema-player.css" />
</head>
<body>
  <div id="player"></div>
  <script src="/assets/asciinema-player.min.js"></script>
  <script>
    AsciinemaPlayer.create(
      '/assets/227038.cast',
      document.getElementById('player'),
      { cols: 88, rows: 30 }
    );
  </script>
</body>
</html>

See asciinema player quick-start guide for full usage instructions.

While this site doesn't provide GIF conversion at the moment, you can still do it yourself with the help of asciinema GIF generator utility - agg.

Once you have it installed, generate a GIF with the following command:

agg https://asciinema.org/a/227038 demo.gif

Copied!

Or, if you already downloaded the recording file:

agg demo.cast demo.gif

Copied!

Check agg --help for all available options. You can change font family and size, select color theme, adjust speed and more.

See agg manual for full usage instructions.