Computer system with groups of processor boards

1. A computer system, comprising:

a plurality of printed circuit boards, each printed circuit board comprising two or more processor chips attached to the printed circuit board and a plurality of connectors, wherein a first subset of the two or more processor chips are connected to a first subset of the plurality of connectors and wherein a second subset of the two or more processor chips are connected to a second subset of the plurality of connectors;

wherein the number of printed circuit boards is an even number greater than or equal to 4, the printed circuit boards are arranged in two groups, each group being arranged in a different stacking direction, and wherein the two or more processor chips which are attached to each one of the printed circuit boards of one of the groups are connected for communication to the processor chips of at least one printed circuit board of the other group.

2. The computer system according to claim 1 , wherein the stacking directions of the two groups are arranged orthogonally.

3. The computer system according to claim 1 , wherein a processor chip is connected to a memory device.

4. The computer system according to claim 1 , wherein the connection of the processor chip to a corresponding memory device is performed using a memory subsystem.

5. The computer system according to claim 1 , wherein the printed circuit board of one of the groups is connected to each of the printed circuit boards of the other group via at least one connector of a plug type or a socket type or a one combined plug and socket type.

6. The computer system according to claim 1 , wherein the one or more processor chips on at least one of the printed circuit boards is connected to the at least one connector on the same printed circuit board and, if more than one processor chip is on the printed circuit board, to all other processor chips on the same printed circuit board.

7. The computer system according to claim 1 , wherein at least one processor chip on at least one of the printed circuit boards of one of the groups comprises a network interface.

8. The computer system according to claim 1 , wherein the one or more processor chips which are attached to one of the printed circuit boards of one of the groups are connected to each of the processor chips of all printed circuit boards of the other group via at least one network router and a network interface controller.

9. The computer system according to claim 1 , wherein at least one processor chip on a printed circuit board of one of the groups is connected to a PCI Express card providing access to the PCI Express card for at least one processor chip on another printed circuit board of the same group or another group.

10. A computer readable storage medium having computer readable instructions stored thereon that, when executed by a computer, implement a method for connecting and communicating across a plurality of printed circuit boards of a computer system, each printed circuit board comprising two or more processor chips attached to the printed circuit board and a plurality of connectors, wherein a first subset of the two or more processor chips are connected to a first subset of the plurality of connectors and wherein a second subset of the two or more processor chips are connected to a second subset of the plurality of connectors, wherein the number of printed circuit boards is an even number greater than or equal to 4, the method comprising:

arranging the printed circuit boards in two groups, each group being arranged in a different stacking direction; and

connecting the two or more processor chips, which are attached to each one of the printed circuit boards of one of the groups, for communication to the processor chips of at least one printed circuit board of the other group.

11. The storage medium according to claim 10 , wherein the communication across the processor chips is performed via at least one of:

a coherent shared memory access;

a non-coherent shared memory access;

providing access to a graphics, storage, communication or other adapter card attached via a PCI-interface;

message passing using a network protocol;

using communication between two or more processor chips on the same printed circuit board; and

at least one network router and a network interface controller connected to at least one processor chip on at least one printed circuit board.

12. The storage medium according to claim 10 , wherein a printed circuit board is unconnected by previously idling its one or more processor chip via a hypervisor running on the computer system.

13. The storage medium according to claim 10 , wherein the communication is tracked by a precise directory.