OSv - A Modern Semi-POSIX LibraryOS Glauber Costa, Lead Engineer - - PowerPoint PPT Presentation

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OSv - A Modern Semi-POSIX LibraryOS Glauber Costa, Lead Engineer - - PowerPoint PPT Presentation

Feb 12, 2024 12 likes •174 views

OSv - A Modern Semi-POSIX LibraryOS Glauber Costa, Lead Engineer glommer@cloudius-systems.com Typical Cloud Stack Application Runtime Protection Operating System and abstraction Hypervisor Hardware Containers Application Application

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SLIDE 1

OSv - A Modern Semi-POSIX LibraryOS

Glauber Costa, Lead Engineer glommer@cloudius-systems.com

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Typical Cloud Stack

Application Runtime Operating System Hypervisor Hardware

Protection and abstraction

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SLIDE 3

Containers

Application Runtime Operating System Hardware Application Runtime

  • high simplicity
  • high resource efficiency
  • high performance
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“Library OS”

Application Runtime + OS Hypervisor Hardware Application Runtime + OS

  • high simplicity
  • high resource efficiency
  • high performance
  • high isolation
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SLIDE 5

Architecture

  • Only one application / many threads
  • Single address space
  • Network channels
  • Written in C++11
  • User API - REST
  • BSD licenced
  • ZFS filesystem
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Not the only one out there

  • Other examples: Erlang-on-Xen, Mirage, ClickOS.
  • But runs on wide range of Hypervisors

○ Xen, KVM/Qemu, VMWare, VirtualBox.

  • Supports a quasi-POSIX API.

○ no fork(), no exec(), ○ largely Linux compatible.

  • Less than 1s boot time.

○ as fast as needed, not as fast as possible.

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SLIDE 7

quasi-POSIX

  • Allow unmodified applications to work,
  • and modified applications to shine.
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SLIDE 8

Performance

  • System calls are free

○ context switches are really cheap ( x 4 Fedora)

  • Network performance significantly faster

○ around 20 % with netperf over Fedora Linux ○ more than 50 % for some UDP workloads

  • I will show you concrete results at the end
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SLIDE 9

What do people think?

Roman Shaposhnik, Bigtop/Hadoop "Mark my words, GridGain [...] and OSv [...] are going to be excitingly disruptive in the next few years. […] And, by the way, if, after reading this blog, you are not dropping everything and porting your cloud application to OSv, I don’t know what’s wrong with you."

http://blog.gopivotal.com/pivotal/features/pivotal-debuts-at-apachecon-north-america-2014-thanks-for-having-us

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The Xen Situation

  • We like HVM because it brings greater flexibility

○ Xen's HVM boot is really slow ○ Other than that, all other goodies are there ■ interrupt injection, pv devices, etc.

  • PVH is viable, but no one looking at the moment.

○ We take patches!

  • PV out of question

○ too complex, ○ technically not possible.

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The Xen Situation - cont

Stack Current Frame 128-byte Red Zone region The Xen Hypervisor does NOT respect that!

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Will my application be fast?

  • short answer:

○ yes

  • short answer 2:

○ no

  • Similar to Ahmdal's law, in the context of parallelism

○ no gains for 95 % CPU hungry userspace applications

  • POSIX APIs poses a limitation.
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Fresh from the Oven

  • Cassandra NoSQL
  • OSv vs CentOS 7
  • up to 25 % faster reads

○ 1 VCPU only

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redis

  • up to 80 % faster than

Ubuntu 14.04

○ 10 Gb networking ○ No specialized interfaces ○ we do have some problems, though ○ check our blog about it, details at http://osv.io/blog/

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memcached

  • unmodified,

○ brings a juicy improvement out of the box.

  • modified:

○ that showcases the real performance opportunity behind OSv.

That's already ~20 % more at http://osv.io/benchmarks/

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SLIDE 16

http://osv.io https://github.com/cloudius-systems/osv @CloudiusSystems

  • sv-dev@googlegroups.com

To know more