OSv – The OS designed for the Cloud

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OSv
Designed for the cloud
Lord Glauber Costa of Sealand
glommer@cloudius-systems.coom
Cloudius Systems

About myself
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Some contributions to Xen
Extensive contributions to Linux and QEMU
Early employee at Cloudius (#4),...

About Sealand
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Mightiest country on Earth
0.025 m² area size
Fought and won a war (15 min) against UK
De facto rec...

About Cloudius
●
●
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Founded in December 2012
~15 people
9 countries
Open source experience
Linux Foundation member

About OSv

OSv
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●
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“Cloud OS” written from scratch
C++11
BSD licensed
Networking stack and ZFS imported from
FreeBSD
○ We are mo...

Typical Cloud Stack
Application
Application Server
JVM
Operating System
Hypervisor
Hardware

Protection
and
abstraction

“Library OS”
●
●
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●

Single application per VM
No kernel and userspace separation
No fork()
MMU access via OSv APIs
POS...

“Library OS”
Application
Application Server
JVM + OSv
Hypervisor
Hardware

Features

OS Services
● Scheduler
● Memory management
○ mmap
○ demand paging

● Networking
● File system
○ ZFS and ramfs

APIs
● Linux system calls
○ uname() reports Linux for compatibility

● libc
● OSv APIs

Architectures
● Pure 64-bit OS
● 64-bit x86
○
○
○
○

KVM
Xen HVM
Xen PV - incomplete
VMware and VirtualBox - in progress

...

Status
● JVM languages
○ Java, JRuby, Scala, Groovy, Clojure, JavaScript

● JVM applications
○ Cassandra
○ Tomcat

● Other...

Performance

Performance
● Outperforms Linux
○ SpecJVM, memcached, netperf

● Same as Linux
○ Tomcat
○ Cassandra

● < 1 second boot tim...

Image Size
● 17 MB minimal image
○ kernel + libc

● 29 MB mruby image
○ kernel + libc + mruby

● 465 MB default image (!)
...

How is OSv different?

Network channels
● Linux network channels by Van Jacobson
○ Proposed in 2006, never merged
○ Packet processing overhead re...

JVM Balloon
● GC heap autotuning
● Steal memory from JVM on OS memory
pressure
● Running on unmodified JVM
○ Compacting GC...

JVM and MMU
● Replace GC card tables with MMU
remapping
● Modified OpenJDK
● Azul C4’s GC uses similar MMU tricks on
x86
○...

Admin

OS Admin
Traditional OS
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Built for a standalone desktop
CLI oriented
Human oriented
File base configuration
Hard...

Roadmap
Alpha Release
3/2014

Git init
osv,
12/201
2

support
for
64 vcpu
02/2013

Java hello world,
01/2013

ZFS support
...

So what about
containers?

Containers
● Docker is awesome
○ Linux control groups not so awesome...

● Fast boot
● Fast provisioning
● Performance

Containers under the hood
● Shared kernel image
○ Kernel upgrades
○ Hardware maintenance

● Complexity in the kernel
● Cop...

OSv - best of both worlds?
● Fast boot, fast provisioning, performance
● Virtualized
○
○
○
○

Saner abstraction layer
Stro...

That’s it!

Thank you!
● Web
○ http://osv.io

● Github
○ http://github.com/cloudius-systems/osv

● Mailing List
○ osv-dev@googlegroups...

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