1. A system for direct communication between hardware accelerators in a computer cluster, comprising: a first hardware accelerator in a first computer of a computer cluster; and a second hardware accelerator in a second computer of the computer cluster; wherein the first computer and the second computer differ from one another and are designed to be able to communicate remotely via a network, and wherein the first accelerator is designed to request data from the second accelerator and to retrieve data by means of a direct memory access to a global address space on the second computer and to communicate data to the second computer, wherein the direct communication between the hardware accelerators of the first and second computers occurs without support of computing units and without support of memory units.