This is not something I've done, but I've been holding onto this paper from Princeton about using old mobile devices as compute nodes [1] which I think might be

This is not something I've done, but I've been holding onto this paper from Princeton about using old mobile devices as compute nodes [1] which I think might be of interest here [1] https://www.usenix.org/conference/hotcloud17/program/presentation/shahrad https://www.usenix.org/conference/hotcloud17/program/present...