Download - OSv – The OS designed for the Cloud
About myself
● Some contributions to Xen● Extensive contributions to Linux and QEMU● Early employee at Cloudius (#4), OSv● после моего выступления, помочь мне
практиковать (медленно пожалуйста)
About Sealand
● Mightiest country on Earth● 0.025 m² area size● Fought and won a war (15 min) against UK● De facto recognition by Germany and UK
About Cloudius
● Founded in December 2012● ~15 people● 9 countries● Open source experience● Linux Foundation member
About OSv
OSv
● “Cloud OS” written from scratch● C++11● BSD licensed● Networking stack and ZFS imported from
FreeBSD○ We are modifying the networking stack○ Switching to OpenZFS in the future
Typical Cloud Stack
Application
Application Server
JVM
Operating System
Hypervisor
Hardware
Protection and
abstraction
● Single application per VM● No kernel and userspace separation● No fork()● MMU access via OSv APIs● POSIX APIs for compatibility
“Library OS”
“Library OS”
Application
Application Server
JVM + OSv
Hypervisor
Hardware
Features
OS Services
● Scheduler● Memory management
○ mmap○ demand paging
● Networking● File system
○ ZFS and ramfs
● Linux system calls○ uname() reports Linux for compatibility
● libc● OSv APIs
APIs
● Pure 64-bit OS● 64-bit x86
○ KVM○ Xen HVM○ Xen PV - incomplete○ VMware and VirtualBox - in progress
● 64-bit ARM - started!● Others - help wanted!
Architectures
Status
● JVM languages○ Java, JRuby, Scala, Groovy, Clojure, JavaScript
● JVM applications○ Cassandra○ Tomcat
● Other runtimes○ mruby○ I would love to see someone port Node.js...
● Native applications○ memcached○ haproxy
Performance
Performance
● Outperforms Linux○ SpecJVM, memcached, netperf
● Same as Linux○ Tomcat○ Cassandra
● < 1 second boot time● 4x faster context switch in scheduler
microbenchmarks than Linux
Image Size
● 17 MB minimal image○ kernel + libc
● 29 MB mruby image○ kernel + libc + mruby
● 465 MB default image (!)○ kernel + libc + openjdk○ openjdk is 127 MB○ ZFS intent log related, working on a fix
How is OSv different?
● Linux network channels by Van Jacobson○ Proposed in 2006, never merged○ Packet processing overhead reduced by 25% for 1
CPU and 20% for 2 CPUs (source: lwn.net)● Network channels in OSv
○ Channel connected to the application● Netperf throughput increases 30% from ~36
Gbps to ~47 Gbps○ Linux on host, OSv in guest
Network channels
JVM Balloon
● GC heap autotuning● Steal memory from JVM on OS memory
pressure● Running on unmodified JVM
○ Compacting GC causes interesting problems● Nice presentation at our youtube channel
● Replace GC card tables with MMU remapping
● Modified OpenJDK● Azul C4’s GC uses similar MMU tricks on
x86○ Out-of-tree Linux patches
JVM and MMU
Admin
OS Admin
Traditional OS● Built for a standalone desktop● CLI oriented● Human oriented● File base configuration● Hard to automate
Cloud OS● Built for mass deployment● API oriented● Machine oriented● API base configuration● Easy to automate
Alpha Release3/2014
Optimized ZFS cacheDirty page writebackJVM page tableHV support:GCE, VMW, VBox
Git init osv, 12/2012
Java hello world, 01/2013
support for64 vcpu 02/2013
UDP, 03/2013
ZFS support> 1Gbps netperf, 6/2013
Cassandra outperforms Linux, 8/2013
Native REST APIMemcached gain > 70%1/2014
Cli and web interface9/2014
Tomcat,HAProxy modules10/2013
Net channelsJVM ballooning >47Gbps netperf 2/2014
Image RepositoryJVM Read barrier eliminationDPDK supportMore ...
Roadmap
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● Copy-on-write userspace
OSv - best of both worlds?
● Fast boot, fast provisioning, performance● Virtualized
○ Saner abstraction layer○ Stronger Isolation○ Heterogeneous datacenter○ MMU access, and other hardware primitives
● Great blog post on Google+ “OSv vs containers”
That’s it!
Thank you!
● Web○ http://osv.io
● Github○ http://github.com/cloudius-systems/osv
● Mailing List○ [email protected]
● You should follow us on Twitter:○ @CloudiusSystems
