executor: add some memory tracker in HashJoin

executor/aggregate.go

@@ -62,13 +62,6 @@ type baseHashAggWorker struct {
 	BInMap     int // indicate there are 2^BInMap buckets in Golang Map.
 }
 
-const (
-	// ref https://github.com/golang/go/blob/go1.15.6/src/reflect/type.go#L2162.
-	// defBucketMemoryUsage = bucketSize*(1+unsafe.Sizeof(string) + unsafe.Sizeof(slice))+2*ptrSize
-	// The bucket size may be changed by golang implement in the future.
-	defBucketMemoryUsage = 8*(1+16+24) + 16
-)
-
 func newBaseHashAggWorker(ctx sessionctx.Context, finishCh <-chan struct{}, aggFuncs []aggfuncs.AggFunc,
 	maxChunkSize int, memTrack *memory.Tracker) baseHashAggWorker {
 	baseWorker := baseHashAggWorker{
@@ -332,7 +325,7 @@ func (e *HashAggExec) initForUnparallelExec() {
 	e.partialResultMap = make(aggPartialResultMapper)
 	e.bInMap = 0
 	failpoint.Inject("ConsumeRandomPanic", nil)
-	e.memTracker.Consume(defBucketMemoryUsage*(1<<e.bInMap) + setSize)
+	e.memTracker.Consume(hack.DefBucketMemoryUsageForMapStrToSlice*(1<<e.bInMap) + setSize)
 	e.groupKeyBuffer = make([][]byte, 0, 8)
 	e.childResult = newFirstChunk(e.children[0])
 	e.memTracker.Consume(e.childResult.MemoryUsage())
@@ -395,7 +388,7 @@ func (e *HashAggExec) initForParallelExec(ctx sessionctx.Context) {
 		}
 		// There is a bucket in the empty partialResultsMap.
 		failpoint.Inject("ConsumeRandomPanic", nil)
-		e.memTracker.Consume(defBucketMemoryUsage * (1 << w.BInMap))
+		e.memTracker.Consume(hack.DefBucketMemoryUsageForMapStrToSlice * (1 << w.BInMap))
 		if e.stats != nil {
 			w.stats = &AggWorkerStat{}
 			e.stats.PartialStats = append(e.stats.PartialStats, w.stats)
@@ -425,7 +418,7 @@ func (e *HashAggExec) initForParallelExec(ctx sessionctx.Context) {
 			groupKeys:           make([][]byte, 0, 8),
 		}
 		// There is a bucket in the empty partialResultsMap.
-		e.memTracker.Consume(defBucketMemoryUsage*(1<<w.BInMap) + setSize)
+		e.memTracker.Consume(hack.DefBucketMemoryUsageForMapStrToSlice*(1<<w.BInMap) + setSize)
 		if e.stats != nil {
 			w.stats = &AggWorkerStat{}
 			e.stats.FinalStats = append(e.stats.FinalStats, w.stats)
@@ -615,7 +608,7 @@ func (w *baseHashAggWorker) getPartialResult(sc *stmtctx.StatementContext, group
 		allMemDelta += int64(len(groupKey[i]))
 		// Map will expand when count > bucketNum * loadFactor. The memory usage will doubled.
 		if len(mapper) > (1<<w.BInMap)*hack.LoadFactorNum/hack.LoadFactorDen {
-			w.memTracker.Consume(defBucketMemoryUsage * (1 << w.BInMap))
+			w.memTracker.Consume(hack.DefBucketMemoryUsageForMapStrToSlice * (1 << w.BInMap))
 			w.BInMap++
 		}
 	}
@@ -1084,7 +1077,7 @@ func (e *HashAggExec) getPartialResults(groupKey string) []aggfuncs.PartialResul
 		allMemDelta += int64(len(groupKey))
 		// Map will expand when count > bucketNum * loadFactor. The memory usage will doubled.
 		if len(e.partialResultMap) > (1<<e.bInMap)*hack.LoadFactorNum/hack.LoadFactorDen {
-			e.memTracker.Consume(defBucketMemoryUsage * (1 << e.bInMap))
+			e.memTracker.Consume(hack.DefBucketMemoryUsageForMapStrToSlice * (1 << e.bInMap))
 			e.bInMap++
 		}
 	}

executor/concurrent_map.go

@@ -16,6 +16,8 @@ package executor
 
 import (
 	"sync"
+
+	"github.com/pingcap/tidb/util/hack"
 )
 
 // ShardCount controls the shard maps within the concurrent map
@@ -28,14 +30,15 @@ type concurrentMap []*concurrentMapShared
 // A "thread" safe string to anything map.
 type concurrentMapShared struct {
 	items        map[uint64]*entry
-	sync.RWMutex // Read Write mutex, guards access to internal map.
+	sync.RWMutex       // Read Write mutex, guards access to internal map.
+	bInMap       int64 // indicate there are 2^bInMap buckets in items
 }
 
 // newConcurrentMap creates a new concurrent map.
 func newConcurrentMap() concurrentMap {
 	m := make(concurrentMap, ShardCount)
 	for i := 0; i < ShardCount; i++ {
-		m[i] = &concurrentMapShared{items: make(map[uint64]*entry)}
+		m[i] = &concurrentMapShared{items: make(map[uint64]*entry), bInMap: 0}
 	}
 	return m
 }
@@ -46,17 +49,18 @@ func (m concurrentMap) getShard(hashKey uint64) *concurrentMapShared {
 }
 
 // Insert inserts a value in a shard safely
-func (m concurrentMap) Insert(key uint64, value *entry) {
+func (m concurrentMap) Insert(key uint64, value *entry) (memDelta int64) {
 	shard := m.getShard(key)
 	shard.Lock()
-	v, ok := shard.items[key]
-	if !ok {
-		shard.items[key] = value
-	} else {
-		value.next = v
-		shard.items[key] = value
+	oldValue := shard.items[key]
+	value.next = oldValue
+	shard.items[key] = value
+	if len(shard.items) > (1<<shard.bInMap)*hack.LoadFactorNum/hack.LoadFactorDen {
+		memDelta = hack.DefBucketMemoryUsageForMapIntToPtr * (1 << shard.bInMap)
+		shard.bInMap++
 	}
 	shard.Unlock()
+	return memDelta
 }
 
 // UpsertCb : Callback to return new element to be inserted into the map

executor/concurrent_map_test.go

@@ -16,9 +16,11 @@ package executor
 
 import (
 	"sync"
+	"sync/atomic"
 	"testing"
 
 	"github.com/pingcap/tidb/util/chunk"
+	"github.com/pingcap/tidb/util/hack"
 	"github.com/stretchr/testify/require"
 )
 
@@ -65,3 +67,36 @@ func TestConcurrentMap(t *testing.T) {
 	_, ok = m.Get(uint64(mod + 1))
 	require.False(t, ok)
 }
+
+func TestConcurrentMapMemoryUsage(t *testing.T) {
+	m := newConcurrentMap()
+	const iterations = 1024 * hack.LoadFactorNum / hack.LoadFactorDen
+	var memUsage int64
+	wg := &sync.WaitGroup{}
+	wg.Add(2)
+	// Using go routines insert 1000 entries into the map.
+	go func() {
+		defer wg.Done()
+		var memDelta int64
+		for i := 0; i < iterations/2; i++ {
+			// Add entry to map.
+			memDelta += m.Insert(uint64(i*ShardCount), &entry{chunk.RowPtr{ChkIdx: uint32(i), RowIdx: uint32(i)}, nil})
+		}
+		atomic.AddInt64(&memUsage, memDelta)
+	}()
+
+	go func() {
+		defer wg.Done()
+		var memDelta int64
+		for i := iterations / 2; i < iterations; i++ {
+			// Add entry to map.
+			memDelta += m.Insert(uint64(i*ShardCount), &entry{chunk.RowPtr{ChkIdx: uint32(i), RowIdx: uint32(i)}, nil})
+		}
+		atomic.AddInt64(&memUsage, memDelta)
+	}()
+	wg.Wait()
+
+	// The first bucket memory usage will be recorded in concurrentMapHashTable, here only test the memory delta.
+	require.Equal(t, int64(1023)*hack.DefBucketMemoryUsageForMapIntToPtr, memUsage)
+	require.Equal(t, int64(10), m.getShard(0).bInMap)
+}

executor/hash_table.go

@@ -20,6 +20,7 @@ import (
 	"hash/fnv"
 	"sync/atomic"
 	"time"
+	"unsafe"
 
 	"github.com/pingcap/errors"
 	"github.com/pingcap/tidb/sessionctx"
@@ -29,6 +30,7 @@ import (
 	"github.com/pingcap/tidb/util/codec"
 	"github.com/pingcap/tidb/util/disk"
 	"github.com/pingcap/tidb/util/execdetails"
+	"github.com/pingcap/tidb/util/hack"
 	"github.com/pingcap/tidb/util/memory"
 )
 
@@ -186,6 +188,7 @@ func (c *hashRowContainer) PutChunkSelected(chk *chunk.Chunk, selected, ignoreNu
 		rowPtr := chunk.RowPtr{ChkIdx: chkIdx, RowIdx: uint32(i)}
 		c.hashTable.Put(key, rowPtr)
 	}
+	c.GetMemTracker().Consume(c.hashTable.GetMemoryDelta())
 	return nil
 }
 
@@ -251,7 +254,7 @@ func newEntryStore() *entryStore {
 	return es
 }
 
-func (es *entryStore) GetStore() (e *entry) {
+func (es *entryStore) GetStore() (e *entry, memDelta int64) {
 	sliceIdx := uint32(len(es.slices) - 1)
 	slice := es.slices[sliceIdx]
 	if es.cursor >= cap(slice) {
@@ -263,6 +266,7 @@ func (es *entryStore) GetStore() (e *entry) {
 		es.slices = append(es.slices, slice)
 		sliceIdx++
 		es.cursor = 0
+		memDelta = int64(unsafe.Sizeof(entry{})) * int64(size)
 	}
 	e = &es.slices[sliceIdx][es.cursor]
 	es.cursor++
@@ -273,6 +277,7 @@ type baseHashTable interface {
 	Put(hashKey uint64, rowPtr chunk.RowPtr)
 	Get(hashKey uint64) (rowPtrs []chunk.RowPtr)
 	Len() uint64
+	GetMemoryDelta() int64
 }
 
 // TODO (fangzhuhe) remove unsafeHashTable later if it not used anymore
@@ -283,6 +288,9 @@ type unsafeHashTable struct {
 	hashMap    map[uint64]*entry
 	entryStore *entryStore
 	length     uint64
+
+	bInMap   int64 // indicate there are 2^bInMap buckets in hashMap
+	memDelta int64
 }
 
 // newUnsafeHashTable creates a new unsafeHashTable. estCount means the estimated size of the hashMap.
@@ -297,11 +305,16 @@ func newUnsafeHashTable(estCount int) *unsafeHashTable {
 // Put puts the key/rowPtr pairs to the unsafeHashTable, multiple rowPtrs are stored in a list.
 func (ht *unsafeHashTable) Put(hashKey uint64, rowPtr chunk.RowPtr) {
 	oldEntry := ht.hashMap[hashKey]
-	newEntry := ht.entryStore.GetStore()
+	newEntry, memDelta := ht.entryStore.GetStore()
 	newEntry.ptr = rowPtr
 	newEntry.next = oldEntry
 	ht.hashMap[hashKey] = newEntry
+	if len(ht.hashMap) > (1<<ht.bInMap)*hack.LoadFactorNum/hack.LoadFactorDen {
+		memDelta += hack.DefBucketMemoryUsageForMapIntToPtr * (1 << ht.bInMap)
+		ht.bInMap++
+	}
 	ht.length++
+	ht.memDelta += memDelta
 }
 
 // Get gets the values of the "key" and appends them to "values".
@@ -318,11 +331,19 @@ func (ht *unsafeHashTable) Get(hashKey uint64) (rowPtrs []chunk.RowPtr) {
 // if the same key is put more than once.
 func (ht *unsafeHashTable) Len() uint64 { return ht.length }
 
+// GetMemoryDelta gets the memDelta of the concurrentMapHashTable.
+func (ht *unsafeHashTable) GetMemoryDelta() int64 {
+	memDelta := ht.memDelta
+	ht.memDelta = 0
+	return memDelta
+}
+
 // concurrentMapHashTable is a concurrent hash table built on concurrentMap
 type concurrentMapHashTable struct {
 	hashMap    concurrentMap
 	entryStore *entryStore
 	length     uint64
+	memDelta   int64
 }
 
 // newConcurrentMapHashTable creates a concurrentMapHashTable
@@ -331,6 +352,7 @@ func newConcurrentMapHashTable() *concurrentMapHashTable {
 	ht.hashMap = newConcurrentMap()
 	ht.entryStore = newEntryStore()
 	ht.length = 0
+	ht.memDelta = hack.DefBucketMemoryUsageForMapIntToPtr + int64(unsafe.Sizeof(entry{}))*initialEntrySliceLen
 	return ht
 }
 
@@ -341,10 +363,13 @@ func (ht *concurrentMapHashTable) Len() uint64 {
 
 // Put puts the key/rowPtr pairs to the concurrentMapHashTable, multiple rowPtrs are stored in a list.
 func (ht *concurrentMapHashTable) Put(hashKey uint64, rowPtr chunk.RowPtr) {
-	newEntry := ht.entryStore.GetStore()
+	newEntry, memDelta := ht.entryStore.GetStore()
 	newEntry.ptr = rowPtr
 	newEntry.next = nil
-	ht.hashMap.Insert(hashKey, newEntry)
+	memDelta += ht.hashMap.Insert(hashKey, newEntry)
+	if memDelta != 0 {
+		atomic.AddInt64(&ht.memDelta, memDelta)
+	}
 	atomic.AddUint64(&ht.length, 1)
 }
 
@@ -357,3 +382,15 @@ func (ht *concurrentMapHashTable) Get(hashKey uint64) (rowPtrs []chunk.RowPtr) {
 	}
 	return
 }
+
+// GetMemoryDelta gets the memDelta of the concurrentMapHashTable. Memory delta will be cleared after each fetch.
+func (ht *concurrentMapHashTable) GetMemoryDelta() int64 {
+	var memDelta int64
+	for {
+		memDelta = atomic.LoadInt64(&ht.memDelta)
+		if atomic.CompareAndSwapInt64(&ht.memDelta, memDelta, 0) {
+			break
+		}
+	}
+	return memDelta
+}

executor/hash_table_test.go

@@ -18,12 +18,14 @@ import (
 	"fmt"
 	"hash"
 	"hash/fnv"
+	"sync"
 	"testing"
 
 	"github.com/pingcap/tidb/parser/mysql"
 	"github.com/pingcap/tidb/types"
 	"github.com/pingcap/tidb/types/json"
 	"github.com/pingcap/tidb/util/chunk"
+	"github.com/pingcap/tidb/util/hack"
 	"github.com/pingcap/tidb/util/memory"
 	"github.com/pingcap/tidb/util/mock"
 	"github.com/stretchr/testify/require"
@@ -162,3 +164,19 @@ func testHashRowContainer(t *testing.T, hashFunc func() hash.Hash64, spill bool)
 	require.Equal(t, chk1.GetRow(1).GetDatumRow(colTypes), matched[1].GetDatumRow(colTypes))
 	return rowContainer, copiedRC
 }
+
+func TestConcurrentMapHashTableMemoryUsage(t *testing.T) {
+	m := newConcurrentMapHashTable()
+	const iterations = 1024 * hack.LoadFactorNum / hack.LoadFactorDen // 6656
+	wg := &sync.WaitGroup{}
+	wg.Add(2)
+	// Note: Now concurrentMapHashTable doesn't support inserting in parallel.
+	for i := 0; i < iterations; i++ {
+		// Add entry to map.
+		m.Put(uint64(i*ShardCount), chunk.RowPtr{ChkIdx: uint32(i), RowIdx: uint32(i)})
+	}
+	mapMemoryExpected := int64(1024) * hack.DefBucketMemoryUsageForMapIntToPtr
+	entryMemoryExpected := 16 * int64(64+128+256+512+1024+2048+4096)
+	require.Equal(t, mapMemoryExpected+entryMemoryExpected, m.GetMemoryDelta())
+	require.Equal(t, int64(0), m.GetMemoryDelta())
+}

util/hack/hack.go

@@ -56,3 +56,12 @@ const (
 	// LoadFactorDen is the denominator of load factor
 	LoadFactorDen = 2
 )
+
+const (
+	// DefBucketMemoryUsageForMapStrToSlice = bucketSize*(1+unsafe.Sizeof(string) + unsafe.Sizeof(slice))+2*ptrSize
+	// ref https://github.com/golang/go/blob/go1.15.6/src/reflect/type.go#L2162.
+	// The bucket size may be changed by golang implement in the future.
+	DefBucketMemoryUsageForMapStrToSlice = 8*(1+16+24) + 16
+	// DefBucketMemoryUsageForMapIntToPtr = bucketSize*(1+unsafe.Sizeof(uint64) + unsafe.Sizeof(pointer))+2*ptrSize
+	DefBucketMemoryUsageForMapIntToPtr = 8*(1+8+8) + 16
+)