OpenSSI has in the past worked with UML, I have no idea how much work would be needed to get it going again.
OpenSSI can also work with Xen, I also have no idea how hard that is to set up.
OpenSSI works as-is with kvm (with appropriate hardware) and qemu. This is what I recommend as a way of trying out "thrown away" clusters and debugging.
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OpenSSI has in the past worked with UML, I have no idea how much work would be needed to get it going again.
OpenSSI can also work with Xen, I also have no idea how hard that is to set up.
OpenSSI works as-is with kvm (with appropriate hardware) and qemu. This is what I recommend as a way of trying out "thrown away" clusters and debugging.