chore: Add base benchmark for internal/function (#751)

* chore: Add base benchmark for internal/function

* update comment

internal/function/function_test.go

@@ -0,0 +1,52 @@
+package function
+
+import (
+	"testing"
+
+	"RedisShake/internal/config"
+	"RedisShake/internal/entry"
+)
+
+// BenchmarkRunFunction is a benchmark for RunFunction
+// Command is `go test -benchmem -bench="RunFunction$" -count=5 RedisShake/internal/function`
+// Output is:
+//
+// BenchmarkRunFunction-16             6741            182470 ns/op          234715 B/op       1079 allocs/op
+// BenchmarkRunFunction-16             7443            174567 ns/op          234710 B/op       1079 allocs/op
+// BenchmarkRunFunction-16             7101            178651 ns/op          234711 B/op       1079 allocs/op
+// BenchmarkRunFunction-16             6856            164739 ns/op          234722 B/op       1079 allocs/op
+// BenchmarkRunFunction-16             6804            174768 ns/op          234713 B/op       1079 allocs/op
+func BenchmarkRunFunction(b *testing.B) {
+	config.Opt = config.ShakeOptions{
+		Function: `
+local prefix = "mlpSummary:"
+local prefix_len = #prefix
+if KEYS[1] == nil then
+  return
+end
+if KEYS[1] == "" then
+  return
+end
+if string.sub(KEYS[1], 1, prefix_len) ~= prefix then
+  return
+end
+shake.call(DB, ARGV)
+`,
+	}
+	Init()
+	e := &entry.Entry{
+		DbId:           0,
+		Argv:           []string{"set", "mlpSummary:1", "1"},
+		CmdName:        "set",
+		Group:          "default",
+		Keys:           []string{"mlpSummary:1"},
+		KeyIndexes:     []int{1},
+		Slots:          []int{0},
+		SerializedSize: 32,
+	}
+	b.ResetTimer()
+	b.ReportAllocs()
+	for i := 0; i < b.N; i++ {
+		RunFunction(e)
+	}
+}