Lightning Talk: Erlang on Xen - Mikhail Bortnyk

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The document discusses running Erlang applications directly on the Xen hypervisor without an operating system. It notes that traditionally Erlang applications run within a Linux virtual machine on Xen, which introduces significant overhead. As an alternative, it describes "LING", an Erlang virtual machine developed by Cloudozer that runs on Xen without an OS, reducing the memory footprint to around 8 MB per instance plus 20 MB of memory to run. LING offers a more lightweight way to run Erlang applications in the cloud without traditional operating system overhead.

Software

Erlang on Xen
Mikhail Bortnyk, Amoniac OU

What to know
• XEN - virtualization hypervisor, modiﬁed Linux
kernel, isolated domains, paravirtualization support

What to know
• XEN - virtualization hypervisor, modiﬁed Linux
kernel, isolated domains, paravirtualization support
• Erlang - functional concurrent programming
language (all you guys know about it, right?)

Typical application case
Bare
metal
Operating system

Typical application case
Bare
metal
Operating system
Your application

Wait, everything is
about clouds currently!

Typical cloud application
case
Bare
metal

Typical cloud application
case
Bare
metal
Virtualization hypervisor
HOST OS

Typical cloud application
case
Bare
metal
Virtualization hypervisor
HOST OS
Guest OS Guest OS Guest OS

Typical cloud application
case
Bare
metal
Virtualization hypervisor
HOST OS
Guest OS Guest OS Guest OS
Your application Your application Your application

What’s wrong with this?
• Let’s imagine: our app is like, huh, 200 kilobytes

What’s wrong with this?
• Let’s imagine: our app is like, huh, 200 KB
• It doesn’t matter - Linux kernel is ~10 MB

What’s wrong with this?
• Let’s imagine: our app is like, huh, 200 KB
• It doesn’t matter - Linux kernel is ~10 MB
• Typical Linux image is ~ 400 MB

What’s wrong with this?
• Let’s imagine: our app is like, huh, 200 KB
• It doesn’t matter - Linux kernel is ~10 MB
• Typical Linux image is ~ 400 MB
• Multiply this on amount of instances

Erlang on XEN
• Erlang VM running on XEN guest without operating
system

Erlang on XEN
• Erlang VM running on XEN guest without operating
system
• Actually named LING

Erlang on XEN
• Erlang VM running on XEN guest without operating
system
• Actually named LING
• Developed by Cloudozer

Erlang on XEN
• Erlang VM running on XEN guest without operating
system
• Actually named LING
• Developed by Cloudozer
• Performed in C and Erlang

Erlang on XEN
• Erlang VM running on XEN guest without operating
system
• Actually named LING
• Developed by Cloudozer
• Performed in C and Erlang
• Footprint is pretty small: 1.2 MB of low-level code + 2
MB of C stack + 2 MB of imported modules + 2 MB of
network buffers = ~ 8 MB

Some little demo
(what can go wrong,
srsly?)

What to hack
• Code is open-sourced (look into for license details)

What to hack
• Code is open-sourced (look into for license details)
• Teach it to work with Elixir (actually, lingex)

What to hack
• Code is open-sourced (look into for license details)
• Teach it to work with Elixir (actually, lingex)
• Make LING alive again! (last commit - Oct 2015)

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Доповідь Валерія Василькова, Founder at Digitbay, на Elixir Evening Club 3, Kyiv, 13.12.2018 Наступна конференція - http://www.elixirkyiv.club/ We will talk about Erlang distribution under the hood. Use cases, production usage and maintenance. Cлідкуйте за нами у соцмережах @ElixirClubUA та #ElixirClubUA Анонси та матеріали конференцій - https://www.fb.me/ElixirClubUA Новини - https://twitter.com/ElixirClubUA Фото та невимушена атмосфера - https://www.instagram.com/ElixirClubUA *Канал організаторів мітапа - https://t.me/incredevly

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