Grainsize64
Grainsize64 is a term used in parallel programming to denote a fixed granularity of work units, typically set to 64 elements or iterations. It is commonly implemented as a compile-time constant or a configurable parameter that groups portions of a workload into chunks that the scheduler can assign to threads.
In practice, a loop over a large data set is divided into consecutive chunks of 64 items,
The choice of 64 reflects a common compromise on many-core CPUs, aligning with typical cache line sizes
Variants such as grainsize32 or grainsize128 are used to explore different granularities. In benchmarking and performance
See also: parallel programming, task scheduling, grain size, performance tuning.