最大数字数据类型MPI

Question

What is the largest C number datatype MPI supports? Is there some way to use intmax_t ?

I want to calculate the factorial, but I can't get over 170!.

Answer 1

The largest primitive integer data type would be an MPI_UINT64_T which would get you up to 2^64 - 1

For larger integers you would have to use a library such as GMP which supports arbitary precision arithmatic. You would then have to set up an MPI derived data type to use them with MPI though.