From f4b766e86d070acec4f45da61ab7c0a73333826c Mon Sep 17 00:00:00 2001
From: sentriz <senan@senan.xyz>
Date: Thu, 4 Jul 2019 14:08:44 +0100
Subject: [PATCH] add scanner benchmarking

---
 scanner/scanner_test.go | 66 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 66 insertions(+)
 create mode 100644 scanner/scanner_test.go

diff --git a/scanner/scanner_test.go b/scanner/scanner_test.go
new file mode 100644
index 0000000..be9d653
--- /dev/null
+++ b/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