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simonh parent
Up to a point. There's Hardware Partitioning in which the hardware allows you to specify which processors or memory are dedicated to which OS but there's little dynamic sharing. The only real way to do dynamic resource sharing is with software virtualization (which does still require hardware features, but many platforms support this nowadays) where either the OSes run under a Hypervisor layer, or one OS runs in a virtual machine running as an application within another. Arguably the latter is just a variation on the former. Or vice versa depending who you ask.

https://en.wikipedia.org/wiki/Logical_partition http://www.computerworld.com/article/2593387/server-partitio...

Keyframe
So, what would be the best solution to run three (Fedora, Windows 8 or 10 and OSX or more) OS' under a common hypervisor and achieve (almost) full speed? Or alternatively, Fedora as main and the other ones as VMs, but also with (almost) full speed and graphics acceleration.
simonh OP
You're not going to get full speed, but it depends on what you want to be fast. Graphics intensive activities are going to be constrained by the specifics of the design you go for. Apart from that the biggest constraint is memory since every GB allocated to one OS will by definition not be available to the others. However CPU support for virtualization is pretty good these days. Most of the i7 and i5 CPUs have built in instructions to make it pretty efficient for processor tasks.

Personally I have a 2014 5K iMac i7 with a fusion drive. I have a Fedora VM on it I run occasionally. I run it using Virtualbox which is a free virtualization system. I've allocated 4 GB of memory and it's very performant. It's a great way to try out virtualization at home and you can run Virtualbox on Linux, OSX or Windows as the host OS.

Keyframe
Crap situation for me then since I need CPU, GPU, and RAM to the max for Video and 3D DCC apps.

Somehow, I thought there was this magical hypervisor that would give all to one OS that I could use and then, out of nowhere, I could switch to another OS in a way that first one would go to sleep and its memory put on hard drive and the other one would wake up its memory from hard drive and show up. I wouldn't need them running concurrently, but I would like to have them switch fast.

In a way I would like to consolidate three machines into one without having to run three machines or wait for shutdown/boot sequences (with multi boot).

Bonus would be to share disks (non boot ones) and copy and paste. That would be really great.

zymhan
A KVM Hypervisor would be ideal, in my experience and opinion. Using the virtio drivers will give you great performance for virtualized devices like disks and NICs, and you can also directly attach devices and use PCI passthrough to achieve full-native performance for a device in the guest OS.

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