why "ERROR: block size must be a multiple of access size"

[roblatham00]

I think one of the input validations are too restrictive:

in ValidateTests:

https://github.com/hpc/ior/blob/main/src/ior.c#L1505 and https://github.com/hpc/ior/blob/main/src/ior.c#L1501

blockSize has long needed to be a multiple of transferSize: sensible.

but why do those values need to be a multiple of sizeof(IOR_size_t )?

I would not expect it to perform well but what if I wanted to see a transfer size of a prime number? or even just "50"

[JulianKunkel]

Various code uses that assumption for improving performance, e.g., for validation, for datatype selection in MPI (now should be fixed). It could be changed, that is true but takes a moment to check all the code paths.