require 'postgres'

pids = []

threshold = ARGV[0];
offset = ARGV[1];

sql = "
SET trace_sync_seqscan=true;
SET sync_seqscan_threshold=#{threshold};
SET sync_seqscan_offset=#{offset};
SELECT COUNT(*) FROM bigtable;
"

def getconn()
	PGconn.connect('/tmp',nil,nil,nil,'db02','jdavis',nil)
end

for i in 0..4 do
	pids << fork {
		db = getconn
		sleep i*30 + 1
		db.exec sql
	}
end

pids.each{ |pid| Process.waitpid pid }