Memory access optimization for an I/O adapter in a processor complex

A system for memory access optimization for an input/output (I/O) adapter in a processor complex, the system comprising:

• a plurality of logical partitions allocated between one or more processors of one or more processing nodes with a local memory system in one or more processor drawers of the processor complex;
• a plurality of I/O drawers, each of the I/O drawers comprising one or more I/O cards, each of the I/O cards comprising one or more instances of the I/O adapter, wherein the processor complex is configured to:
• determine a memory block distance between the I/O adapter and a memory block location in the local memory system;
• determine one or more memory movement type criteria between the I/O adapter and the memory block location based on the memory block distance;
• select a memory movement operation type based on a memory movement process parameter and the one or more memory movement type criteria, wherein the one or more memory movement type criteria comprise an offload minimum memory block size, and the memory movement process parameter comprises a block size of memory at the memory block location;
• and
• initiate a memory movement process between the I/O adapter and the memory block location using the memory movement operation type.

A computer program product for memory access optimization for an input/output (I/O) adapter in a processor complex, the computer program product comprising a non-transitory computer readable storage medium having program instructions embodied therewith, the program instructions executable by processing circuitry to cause the processing circuitry to perform:

• determining a memory block distance between the I/O adapter and a memory block location in the processor complex;
• determining one or more memory movement type criteria between the I/O adapter and the memory block location based on the memory block distance;
• selecting a memory movement operation type based on a memory movement process parameter and the one or more memory movement type criteria, wherein the one or more memory movement type criteria comprise an offload minimum memory block size, and the memory movement process parameter comprises a block size of memory at the memory block location;
• and
• initiating a memory movement process between the I/O adapter and the memory block location using the memory movement operation type.