Main pgbench logic consists of single file pgbench.c which is 4036 lines of code as of today. This is not a small number and I think it would be nice if it is divided into smaller files because it will make it easier to maintain, add or change features of pgbench. I will come up with an idea how to split pgbench.c later. In the mean time I attached a call graph of pgbench.c generated by egypt, which we could get a basic idea how to split and modularize pgbench.c.
I've never found the raw line count of a file to be a problem, at least not at the 4000 line mark.
If some functions could be moved to existing libraries (like the functions strtoint64 or doConnect or read_line_from_file or the statistical distribution functions) that would be great, but I assume that would have been done already if there was already a logical place to hold them. I don't think inventing new libraries just to hold these would be an improvement.
If you provided a suggested dissection, maybe I would find it compelling. But without seeing a concrete proposal I think the process of refactoring is going to impede other improvements more than the result of refactoring it will promote them.
