all: ensure b.ReportAllocs() in all the benchmarks (#8460)

With this change, we'll get details on the number of
allocations performed by code. Later on when we have
continuous benchmarking infrastructure, this change
will prove useful to flag regressions.

Fixes #8459

Co-authored-by: Alessio Treglia <alessio@tendermint.com>

store/cache/benchmark_test.go

@@ -22,6 +22,7 @@ func populate(mgr *CommitKVStoreCacheManager) {
 }
 
 func BenchmarkReset(b *testing.B) {
+	b.ReportAllocs()
 	mgr := freshMgr()
 
 	b.ResetTimer()

store/cachekv/store_bench_test.go

@@ -12,6 +12,7 @@ import (
 )
 
 func benchmarkCacheKVStoreIterator(numKVs int, b *testing.B) {
+	b.ReportAllocs()
 	mem := dbadapter.Store{DB: dbm.NewMemDB()}
 	cstore := cachekv.NewStore(mem)
 	keys := make([]string, numKVs)

store/cachekv/store_test.go

@@ -516,6 +516,7 @@ func (krc *keyRangeCounter) key() int {
 func bz(s string) []byte { return []byte(s) }
 
 func BenchmarkCacheKVStoreGetNoKeyFound(b *testing.B) {
+	b.ReportAllocs()
 	st := newCacheKVStore()
 	b.ResetTimer()
 	// assumes b.N < 2**24
@@ -525,6 +526,7 @@ func BenchmarkCacheKVStoreGetNoKeyFound(b *testing.B) {
 }
 
 func BenchmarkCacheKVStoreGetKeyFound(b *testing.B) {
+	b.ReportAllocs()
 	st := newCacheKVStore()
 	for i := 0; i < b.N; i++ {
 		arr := []byte{byte((i & 0xFF0000) >> 16), byte((i & 0xFF00) >> 8), byte(i & 0xFF)}

store/iavl/store_test.go

@@ -556,6 +556,7 @@ func TestIAVLStoreQuery(t *testing.T) {
 }
 
 func BenchmarkIAVLIteratorNext(b *testing.B) {
+	b.ReportAllocs()
 	db := dbm.NewMemDB()
 	treeSize := 1000
 	tree, err := iavl.NewMutableTree(db, cacheSize)

store/rootmulti/store_test.go

@@ -689,6 +689,7 @@ func BenchmarkMultistoreSnapshotRestore1M(b *testing.B) {
 }
 
 func benchmarkMultistoreSnapshot(b *testing.B, stores uint8, storeKeys uint64) {
+	b.ReportAllocs()
 	b.StopTimer()
 	source := newMultiStoreWithGeneratedData(dbm.NewMemDB(), stores, storeKeys)
 	version := source.LastCommitID().Version
@@ -716,6 +717,7 @@ func benchmarkMultistoreSnapshot(b *testing.B, stores uint8, storeKeys uint64) {
 }
 
 func benchmarkMultistoreSnapshotRestore(b *testing.B, stores uint8, storeKeys uint64) {
+	b.ReportAllocs()
 	b.StopTimer()
 	source := newMultiStoreWithGeneratedData(dbm.NewMemDB(), stores, storeKeys)
 	version := uint64(source.LastCommitID().Version)