Hello Doug,

Patch applies, compiles, tests ok.

   > [...] Replaced USE_PPOLL with HAVE_PPOLL as having both seems redundant.

   I'm okay with that. I'm wondering whether there should be a way to force
   using one or the other when both are available. Not sure.

Added option to force use of select(2) via:  -DUSE_SELECT

USE_SELECT could mean something somewhere. Maybe use something more specific like PGBENCH_USE_SELECT? Having this macro available simplifies testing.

I'm not sure why you do the following trick, could you explain?
  +#undef USE_SELECT
  +#define USE_SELECT

In the select implementation you do:

 return (socket_set *) pg_malloc0(sizeof(socket_set) * MAXCLIENTS);

but ISTM that socket_set is already an fd_set which represents a set of clients, so allocating a number of it is needed. The initial implementation just does "fs_set input_mask", whetever the number of clients, and it works fine.

--
Fabien.

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