add scanner benchmarking

scanner/scanner_test.go

@@ -0,0 +1,66 @@
+package scanner
+
+import (
+	"io/ioutil"
+	"log"
+	"testing"
+
+	"github.com/jinzhu/gorm"
+	_ "github.com/jinzhu/gorm/dialects/sqlite"
+
+	"github.com/sentriz/gonic/db"
+)
+
+var testScanner *Scanner
+
+func init() {
+	db, err := db.New(":memory:")
+	if err != nil {
+		log.Fatalf("error opening database: %v\n", err)
+	}
+	// benchmarks aren't real code are they? >:)
+	// here is an absolute path to my music directory
+	testScanner = New(db, "/home/senan/music")
+	log.SetOutput(ioutil.Discard)
+}
+
+func resetTables(db *gorm.DB) {
+	tx := db.Begin()
+	defer tx.Commit()
+	tx.Exec("delete from tracks")
+	tx.Exec("delete from artists")
+	tx.Exec("delete from albums")
+}
+
+func resetTablesPause(db *gorm.DB, b *testing.B) {
+	b.StopTimer()
+	defer b.StartTimer()
+	resetTables(db)
+}
+
+func BenchmarkScanFresh(b *testing.B) {
+	for n := 0; n < b.N; n++ {
+		resetTablesPause(testScanner.db, b)
+		testScanner.Start()
+	}
+}
+
+func BenchmarkScanIncremental(b *testing.B) {
+	// do a full scan and reset
+	testScanner.Start()
+	b.ResetTimer()
+	// do the inc scans
+	for n := 0; n < b.N; n++ {
+		testScanner.Start()
+	}
+}
+
+// RESULTS fresh
+// 20 times / 1.436
+// 20 times / 1.39
+
+// RESULTS inc
+// 100 times / 1.86
+// 100 times / 1.9
+// 100 times / 1.5
+// 100 times / 1.48