this seems to be the latest incarnation, not sure if it is still active. but it came out of openMOSIX, i read.
http://linuxpmi.org/trac/
however,
Is LinuxPMI SSI(single system image) software?
A: No. LinuxPMI is multi-system-image software. it looks like SSI, but from the perspective of *each* *node*. LinuxPMI can work in clusters with a diverse choice in linux distributions, libraries, etc. the only thing that must remain the same are CPU types, and some OS kernel features
http://linuxpmi.org/trac/
however,
Is LinuxPMI SSI(single system image) software?
A: No. LinuxPMI is multi-system-image software. it looks like SSI, but from the perspective of *each* *node*. LinuxPMI can work in clusters with a diverse choice in linux distributions, libraries, etc. the only thing that must remain the same are CPU types, and some OS kernel features