Re: PATCH: pgbench - option to build using ppoll() for larger connection counts

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.