test: ✨ add conversion method benchmark

lib/timeseries/hoarder/convbenchmark.rb

@@ -0,0 +1,84 @@
+
+
+require 'benchmark'
+require 'numo/narray'
+
+require 'bindata'
+
+class PGDataFloatArray < BinData::Record
+	array :numbers do
+		uint32be  value: 8
+		double_be :pg_data
+	end
+end
+
+n = 1000
+rand_data = 10000.times.to_a.map { rand() };
+
+Benchmark.bmbm do |x|
+	x.report("PostgreSQL String:") do
+		n.times do
+			result_array = "{#{rand_data.join(',')}}"
+		end
+	end
+
+	x.report("Binary pack:") do
+		n.times do
+			result_array = rand_data.pack("G*");
+		end
+	end
+
+	x.report("Numo-NArray to_bytes:") do
+		numo_array = Numo::DFloat[rand_data]
+		n.times do
+			result_array = numo_array.to_network.to_binary
+		end
+	end
+
+#	x.report("Binary pack with join:") do
+#		n.times do
+#			pg_array = PGDataFloatArray.new()
+#			data = {pg_data: 0}
+#			rand_data.each { |v| data[:pg_data] = v; pg_array.numbers << data }
+#			
+#			result_array = pg_array.to_binary_s
+#		end
+#	end
+
+	x.report(".pack() then string insert:") do
+		n.times do
+			insert_key = [8].pack("N");
+
+			result_array = rand_data.pack("G*");
+			rand_data.size.times do |i|
+				result_array.insert(i*12, insert_key)
+			end
+		end
+	end
+
+	x.report(".map(.pack).join()") do
+		n.times do
+			join_sep = [8].pack("N");
+			pack_arr = [0]
+
+			result_array = rand_data.map { |v| pack_arr[0] = v; pack_arr.pack("G") }.join(join_sep)
+		end
+	end
+
+	x.report("Prefilled string slicing") do
+		n.times do
+			prep_string = [8].pack("Nx8") * rand_data.length
+			pack_str = "G"
+			pack_array = [0]
+			pack_buffer = '        '
+			pack_opts = {
+				buffer: pack_buffer
+			}
+			
+			rand_data.each_index do |index|
+				pack_array[0] = rand_data[index]
+				prep_string[12*index + 4, 8] = pack_array.pack(pack_str)
+			end
+		end
+	end
+end