Tested with PostgreSQL 9.3.

=== Sql Script Body To Test Example ===
\setrandom u1v 1 100000
\setrandom u2v 20000 20999
\setrandom u 1 50000
\setrandom r1 20000 20999
\setrandom r2 20000 20999
\setrandom r3 20000 20999
\setrandom r4 20000 20999
\setrandom r5 20000 20999
\setrandom r6 1 100000
\setrandom r7 1 100000
\setrandom r8 1 100000
\setrandom r9 1 100000
\setrandom r10 1 100000
select * from foo where	(u1 = :u1v  and u2 in (:r1, :r2, :r3, :r4, :r5)) or (u2 = :u2v and u1 in (:r6, :r7, :r8, :r9, :r10));

=== Pgbench Run Line ===
-c = number of concurrent database clients
-f = script file path
-j = number of threads (the clients are evenly distributed among this number of threads)
-n = don't run VACUUM (docs require it be set in case of custom a script)
-U = username
test1 = database name
pgbench.exe -c 10 -f C:/test.sql -j 10 -n -U root test1