Workload manager control of dynamic thread mode switch

A system, comprising:

• one or more processors, wherein each of the one or more processors comprises one or more cores;
• and
• a memory coupled to the one or more processors;
• a workload manager, wherein the workload manager determines which of a plurality of workloads received by the system are eligible to use a processor core operating in a multi-threaded mode and which workloads are response sensitive and should use a processor core operating in a single-thread mode;
• and
• a hypervisor, wherein the hypervisor is operable to:
• determine a state of operation for the one or more cores of one or more processors of the system;
• and
• cause a core switch for at least one or more cores of the one or more processors in response to:
• (i) a determination that workloads eligible to use a processor core operating in a multi-threaded mode or that are response sensitive exist;
• and (ii) a determination that the state of operation for one or more cores of one or more processors should change to facilitate handling the associated workloads;
• wherein the one or more cores of the one or more processors are operable to handle the plurality of workloads.

A computer program product for operating a computer system using a workload manager to control a dynamic thread mode switch, the computer program product comprising:

• a non-transitory computer readable storage medium having stored thereon first program instructions executable by a processor to cause the processor to:
• receive a plurality of workloads;
• determine which of the plurality of workloads are eligible to use a processor core operating in a multi-threaded mode and which workloads are response sensitive and should use a processor core operating in a single-thread mode;
• determine a state of operation for one or more cores of one or more processors of the computer system;
• cause a core switch for at least one or more cores of one or more processors in response to:
• (i) a determination that workloads eligible to use a processor core operating in a multi-threaded mode or that are response sensitive exist;
• and (ii) a determination that the state of operation for one or more cores of one or more processors should change to facilitate handling the associated workloads;
• and
• handle the plurality of workloads.