Add a simple pgbench

Very naive, just to quickly evaluate perf as w go.

Makefile

@@ -17,5 +17,5 @@ pgbench: NPROCS=$(shell nproc)
 pgbench: NJOBS=$(shell nproc)
 pgbench: sql/pgbench.sql
 	pgbench -f $< -T 10 --progress 1 --no-vacuum \
-		-c $$(( $(NPROCS) * 4 )) \
-		-j $$(( $(NJOBS) * 4 ))
+		-c $$(( $(NPROCS) * 16 )) \
+		-j $$(( $(NJOBS) * 16 ))

sql/pgbench.sql

@@ -0,0 +1,10 @@
+set client_min_messages to WARNING;
+
+select pacs_create_measure((:client_id)::Name);
+select pacs_increment_measure((:client_id)::Name);
+select pacs_get_measure((:client_id)::Name);
+select pacs_reset_measure((:client_id)::Name);
+select pacs_drop_measure((:client_id)::Name);
+
+\set measure 100 + random(1,5)
+select pacs_increment_measure((:measure)::Name);