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Is there a project for a DBMS on MirageOS? I would relay like to try out MirageOS on a web shop project of mine, but can't imagine to start writing a database,

• avsm 12y ago
  There are three ongoing efforts: 1) The Irmin Git store, which is designed to run both on Xen unikernels and in JavaScript. Thomas Leonard is working on integrating the latter, with very promising results for a React-style interface in the browser. Thomas Gazagnaire is integrating the Xen backend at the moment. Expect an announcement of both of these just as soon as they're ready. 2) The Rump Kernel project has very promising results with MySQL running as a unikernel, so we're working on integrating a MirageOS frontend with a MySQL backend unikernel. 3) The Ctypes library (0.4) that's just been released supports Xen compilation for OCaml bindings, so writing bindings to Sqlite would let you link in directly with a unikernel; https://github.com/ocamllabs/ocaml-ctypes https://github.com/ocamllabs/ocaml-ctypes . There's an ORM we wrote ages ago with this in mind: https://github.com/mirage/orm https://github.com/mirage/orm So the db efforts are full steam ahead at the moment, but no fully released one yet for production. Keep an eye on the blog at http://openmirage.org http://openmirage.org, or drop a note to <mirageos-devel@lists.xenproject.org> for your intended usecase. One interesting advanced prototype that Dave Scott from Citrix built is the XenStore database as a unikernel (that powers inter-VM communication) on top of Irmin. Video: https://www.youtube.com/watch?v=DSzvFwIVm5s https://www.youtube.com/watch?v=DSzvFwIVm5s and a presentation at the Xen Developers Summit: http://decks.openmirage.org/xendevsummit14#/ http://decks.openmirage.org/xendevsummit14#/
  • mercurial 12y ago
    > 2) The Rump Kernel project has very promising results with MySQL running as a unikernel, so we're working on integrating a MirageOS frontend with a MySQL backend unikernel. Interesting. The big issue I see from the proposed model (spin up your application on-demand) is the need to retain a long-lived connection pool to a "traditional" container/machine with a standard relational database (the cost of reestablishing a connection every time would obviate any benefit of the scheme).
    • avsm 12y ago
      That's true with a TCP connection and its three-way handshake. With a shared memory vchan across two VMs, establishing a connection is less than a millisecond (if that).
      • mercurial 12y ago
        Sure, but if you're using both a read/write master and a hot standby for read-only queries on another machine, you're going to need TCP.