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[Xen-devel] ocaml oxenstored2 (forwarded message)
Forwarded with Dave Scott's permission, here is an email about some
work that has been going on to advance the state of oxenstored.
I think this sounds really interesting and I'm looking forward to
seeing the actual patches. Dave, if there's anything we can do,
please let us know.
Thanks,
Ian.
--- Begin Message ---
Hi Wei,
I have been working on oxenstored recently. It's all open-source, and I intend
to send an email to xen-devel about it soon :-)
So far I've made the following changes:
1. it can now use libev to handle events (instead of just calling select()).
This is all transparent now that I'm using a library called "lwt" ("light
weight threads")
2. it can be built as either a stubdom (via Mirage[1]) or as a Unix user-space
process (as before)
3. it supports a new transaction coalesce algorithm which avoids unnecessary
conflicts when starting VMs -- this helps "VM bootstorms" a lot
4. it has an improved quota mechanism which works for driver domains (a driver
domain will need a higher quota than a regular domU)
5. all of its configuration parameters (eg logging config) can be changed live,
by writing to special nodes in the tree (like linux /proc). This helps a lot
when debugging since you can just turn on read logging without needing to
reboot and it makes sense in a stubdom where there is no config file...
6. it has a large unit test suite, to check all those annoying corner-cases:
this makes refactoring much easier
I've been working on the code in github:
https://github.com/djs55/ocaml-xenstore
https://github.com/djs55/ocaml-xenstore-xen
https://github.com/djs55/ocaml-xenstore-clients
There's still a fair amount of work to do, but it's working pretty well.
I've got some design documentation lying around which I'll either add to a
public repo or stick on the xen wiki. After that I'll start a thread on
xen-devel.
Cheers,
Dave
[1] http://www.openmirage.org/ -- a set of tools and libraries for building xen
kernels (stubdoms etc)
> -----Original Message-----
> From: Wei Liu [mailto:Wei.Liu2@xxxxxxxxxx]
> Sent: 02 January 2013 4:35 PM
> To: Dave Scott
> Cc: Wei Liu; Roger Pau Monne
> Subject: Asking about oxenstored2
>
> Hi Dave
>
> I'm Wei Liu and I work for platform team. We currently have an issue about
> scalability of (o)xenstored and xenconsoled. They use select() to handle
> events, which is not desirable when we have thousands of domains.
> We want to fix this issue.
>
> I was told that you're working on oxenstored2 to deal with similar issue. Can
> you tell me about the progress of oxenstored2? Is there any plan to open
> source it?
>
>
> Thanks
> Wei.
>
>
--- End Message ---
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