diff --git a/pkg/sum/labeler/labeler_test.go b/pkg/sum/labeler/labeler_test.go
index 038be55..6670f31 100644
--- a/pkg/sum/labeler/labeler_test.go
+++ b/pkg/sum/labeler/labeler_test.go
@@ -10,10 +10,10 @@ import (
 	"sync"
 	"testing"
 
+	"github.com/efficientgo/core/testutil"
 	"github.com/efficientgo/examples/pkg/sum/sumtestutil"
-"github.com/efficientgo/core/testutil"
-"github.com/gobwas/pool/pbytes"
-"github.com/thanos-io/objstore"
+	"github.com/gobwas/pool/pbytes"
+	"github.com/thanos-io/objstore"
 )
 
 func bench1(b *testing.B, labelFn func(ctx context.Context, objID string) (label, error)) {
@@ -62,7 +62,7 @@ func bench2(b *testing.B, labelFn func(ctx context.Context, objID string) (label
 }
 
 // BenchmarkLabeler recommended run options:
-// $ export ver=v1 && go test -run '^$' -bench '^BenchmarkLabeler' -benchtime 100x -count 5 -cpu 1 -benchmem -memprofile=${ver}.mem.pprof -cpuprofile=${ver}.cpu.pprof | tee ${ver}.txt
+// $ export ver=v1 && go test -run '^$' -bench '^BenchmarkLabeler' -benchtime 100x -count 6 -cpu 1 -benchmem -memprofile=${ver}.mem.pprof -cpuprofile=${ver}.cpu.pprof | tee ${ver}.txt
 func BenchmarkLabeler(b *testing.B) {
 	ctx := context.Background()
 	bkt := objstore.NewInMemBucket()
diff --git a/pkg/sum/sum_test.go b/pkg/sum/sum_test.go
index d248901..bb337f8 100644
--- a/pkg/sum/sum_test.go
+++ b/pkg/sum/sum_test.go
@@ -44,7 +44,7 @@ func lazyCreateTestInput(tb testing.TB, numLines int) string {
 /*
 export ver=v1 && go test \
     -run '^$' -bench '^BenchmarkSum$' \
-    -benchtime 10s -count 5 -cpu 4 -benchmem \
+    -benchtime 10s -count 6 -cpu 4 -benchmem \
     -memprofile=${ver}.mem.pprof -cpuprofile=${ver}.cpu.pprof \
   | tee ${ver}.txt
 */
@@ -140,7 +140,8 @@ func benchmarkSum(tb testutil.TB) {
 }
 
 // BenchmarkSum_fgprof recommended run options:
-// $ export ver=v1fg && go test -run '^$' -bench '^BenchmarkSum_fgprof' -benchtime 60s -count 1 -cpu 1 | tee ${ver}.txt
+// $ export ver=v1fg && go test -run '^$' -bench '^BenchmarkSum_fgprof' \
+//   -benchtime 60s -cpu 1 | tee ${ver}.txt
 // Read more in "Efficient Go"; Example 10-2.
 func BenchmarkSum_fgprof(b *testing.B) {
 	f, err := os.Create("fgprof.pprof")