  Emerging and future applications rely heavily upon systems consisting of
Internet of Things (IoT), edges, data centers, and humans-in-the-loop.
Significantly different from warehouse-scale computers that serve independent
concurrent user requests, this new class of computer systems directly interacts
with the physical world, considering humans an essential part and performing
safety-critical and mission-critical operations; their computations have
intertwined dependencies between not only adjacent execution loops but also
actions or decisions triggered by IoTs, edge, datacenters, or
humans-in-the-loop; the systems must first satisfy the accuracy metric in
predicting, interpreting, or taking action before meeting the performance goal
under different cases. This article argues we need a paradigm shift to
reconstruct the IoTs, edges, data centers, and humans-in-the-loop as a computer
rather than a distributed system. We coin a new term, high fusion computers
(HFCs), to describe this class of systems. The fusion in the term has two
implications: fusing IoTs, edges, data centers, and humans-in-the-loop as a
computer, fusing the physical and digital worlds through HFC systems. HFC is a
pivotal case of the open-source computer systems initiative. We laid out the
challenges, plan, and call for uniting our community's wisdom and actions to
address the HFC challenges. Everything, including the source code, will be
publicly available from the project homepage:
https://www.computercouncil.org/HFC/.
