*yawn*
On 19 August 2014 at 18:16, Kilian Cavalotti <kilian.cavalotti.w...@gmail.com> wrote: > Hi all, > > On Tue, Aug 19, 2014 at 7:10 AM, Douglas Eadline <deadl...@eadline.org> wrote: >> I ran across this interesting paper by IBM: >> An Updated Performance Comparison of Virtual Machines and Linux Containers > > It's an interesting paper, but I kind of feel it's comparing apple to > oranges. They're both round and tasty, but it's not really the same > thing. > > There's probably no need to detail this, but KVM is a virtualization > infrastructure that run full stack OSes (using their own kernels) on > top of a Linux kernel turned into an hypervisor. So yes, it carries > the overhead of running a kernel over a kernel, but also the > flexibility of doing so (ie. you can run different kernel/OS versions > on top of each other, use virtual devices and so on). > Docker, on the other hand, is a containerization infrastructure that > run processes on top of an existing, regular kernel. Not to diminish > its merits, which are great in many areas, but it's closer to a kind > of glorified chroot. > > So, it's no surprise that Docker performance would be the same as the > underlying OS's, while KVM overhead is much more important. There's a > full layer of virtualization difference between the two. > > And they also a ran single VM or container per host. It would probably > also be interesting to see what happens when your run multiple VMs or > multiple containers on the same host. > > I guess it's nice somebody took the time to do the test, to ensure > that Docker management or the LXC infrastructure was not impacting the > containers performance too much, but I'm not sure I really understand > the goal of the paper. Worst case, it will probably be misleading for > people who will end up comparing two different tools with very > different purposes and use cases. "What do you mean I can not upgrade > the kernel in my container?" > > Cheers, > -- > Kilian > _______________________________________________ > Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing > To change your subscription (digest mode or unsubscribe) visit > http://www.beowulf.org/mailman/listinfo/beowulf _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
