Performance-based reallocating of logical processing units to sockets of a computer system

A system for reallocating processing units, the system comprising:

• a memory;
• and
• a processing circuit communicatively coupled with the memory, wherein the system performs a method comprising:
• reallocating a logical processing unit within a multiprocessor computer system, the logical processing unit being one logical processing unit of multiple logical processing units backed by a socket of a plurality of sockets of the multiprocessor computer system, the reallocating comprising:
• monitoring, during execution of program code of the multiple logical processing units, a performance metric of a hardware resource of the socket, the hardware resource being shared by the multiple logical processing units;
• reassigning the logical processing unit, based on the monitoring, to a different socket of the plurality of sockets of the multiprocessor computer system to, in part, improve the performance metric of the hardware resource of the socket;
• and
• wherein:
• the socket comprises a source socket, and the different socket comprises a target socket, and wherein the hardware resource is a source resource, and the target socket has a target resource associated therewith, the target resource being a same type of resource as the source resource;
• the monitoring further comprises identifying, for the plurality of sockets, a socket of the plurality of sockets as the source socket as the socket having a highest resource utilization rate, and identifying, for the plurality of sockets, a socket of the plurality of sockets as the target socket as the socket having a lowest resource utilization rate;
• and
• the reassigning comprises reassigning the logical processing unit based on the monitoring determining that a differential between the source socket's resource utilization rate and the target socket's resource utilization rate exceeds a set threshold.

A computer program product for reallocating processing units, the computer program product comprising:

• a computer readable storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method comprising:
• reallocating a logical processing unit within a multiprocessor computer system, the logical processing unit being one logical processing unit of multiple logical processing units backed by a socket of a plurality of sockets of the multiprocessor computer system, the reallocating comprising:
• monitoring, during execution of program code of the multiple logical processing units, a performance metric of a hardware resource of the socket, the hardware resource being shared by the multiple logical processing units;
• reassigning the logical processing unit, based on the monitoring, to a different socket of the plurality of sockets of the multiprocessor computer system to, in part, improve the performance metric of the hardware resource of the socket;
• and
• wherein:
• the socket comprises a source socket, and the different socket comprises a target socket, and wherein the hardware resource is a source resource, and the target socket has a target resource associated therewith, the target resource being a same type of resource as the source resource;
• the monitoring further comprises identifying, for the plurality of sockets, a socket of the plurality of sockets as the source socket as the socket having a highest resource utilization rate, and identifying, for the plurality of sockets, a socket of the plurality of sockets as the target socket as the socket having a lowest resource utilization rate;
• and
• the reassigning comprises reassigning the logical processing unit based on the monitoring determining that a differential between the source socket's resource utilization rate and the target socket's resource utilization rate exceeds a set threshold.