This article on Oracle VM performance reviews general performance principles,
and follows with a review of Oracle VM architectural features that affect performance.
This will be high-level as a basis for more technical detail in subsequent articles.
How to evaluate and measure performance (short version)
I've been noticing more and more lately that we have a plethora of libraries and programs written for Go, which don't work on one platform or another. The root cause of these is often the use of direct system call coding to system calls such as ioctl(). On some platforms (illumos/solaris!) there is no such system call.
I'm happy to announce that I feel I've wrapped up Govisor to a point where its ready for public consumption.
Govisor is a service similar to supervisord, in that it can be used to manage a bunch of processes. However, it is much richer in that it understands process dependencies, conflicts, and also offers capabilities for self-healing, and consolidated log management.
Is there an alternative to the illumos native fdisk? Yes, for example, GPT fdisk from Rod Smith. It includes the gdisk, cgdisk, sgdisk, and fixparts programs. Site mentions only usage on Linux, FreeBSD, Mac OS X and Windows, but it is possible that GPT fdisk may be suitable on illumos-based distributions. It requires popt library (OmniOS contains it) and latest version built with no problems, except for a small fix for ncurses.
One of the exciting challenges of being an all open source company is figuring out how to get design conversations out of the lunch time discussion and the private IRC/Jabber/Slack channels and into the broader community. There are many different approaches to this, and the most obvious one is to simply use whatever is used for issue tracking.
Once, long ago, there was an engineer who broke the operating system particularly badly. Now, if you’ve implemented important software for any serious length of time, you’ve seriously screwed up at least once — but this was notable for a few reasons. First, the change that the engineer committed was egregiously broken: the machine that served as our building’s central NFS server wasn’t even up for 24 hours running the change before the operating system crashed — an outcome so bad that the commit was unceremoniously reverted (which we called a “backout”).
I've put some distro-const scripts to the github repo at https://github.com/alhazred/firefly for anyone who wants to build their own illumos-based failsafe image. Current stuff was tested on OmniOS but also should work on OpenIndiana. Anyway the code can be simplified, so any pull-requests and customization are welcome.