Merge #125724 #125794

125724: sql: reduce miscellaneous allocations r=yuzefovich a=yuzefovich

See each commit for details.

Combined improvement:
```
name                   old time/op    new time/op    delta
LastWriteWinsInsert-8    1.42ms ±16%    1.44ms ±13%    ~     (p=0.820 n=20+20)

name                   old alloc/op   new alloc/op   delta
LastWriteWinsInsert-8     267kB ± 2%     265kB ± 2%    ~     (p=0.057 n=19+20)

name                   old allocs/op  new allocs/op  delta
LastWriteWinsInsert-8     1.95k ± 0%     1.91k ± 0%  -2.38%  (p=0.000 n=17+18)
```

Epic: CRDB-39063.

125794: roachtest: improve logging in gossip/chaos/nodes=9 r=nvanbenschoten a=nvanbenschoten

Informs #124828.

Release note: None

Co-authored-by: Yahor Yuzefovich <yahor@cockroachlabs.com>
Co-authored-by: Nathan VanBenschoten <nvanbenschoten@gmail.com>

pkg/cmd/roachtest/tests/gossip.go

@@ -96,6 +96,7 @@ SELECT node_id
 				}
 
 				if len(expLiveNodes) == 0 {
+					t.L().Printf("%d: found %d live nodes\n", i, len(liveNodes))
 					expLiveNodes = liveNodes
 					continue
 				}
@@ -119,9 +120,10 @@ SELECT node_id
 		}
 
 		waitForGossip := func(deadNode int) {
-			t.Status("waiting for gossip to exclude dead node")
+			t.Status("waiting for gossip to exclude dead node %d", deadNode)
 			start := timeutil.Now()
 			for {
+				t.L().Printf("checking if gossip excludes dead node %d\n", deadNode)
 				if gossipOK(start, deadNode) {
 					return
 				}

pkg/sql/colexec/colexecargs/BUILD.bazel

@@ -14,6 +14,7 @@ go_library(
         "//pkg/sql/colcontainer",
         "//pkg/sql/colexecerror",
         "//pkg/sql/colexecop",
+        "//pkg/sql/colmem",
         "//pkg/sql/execinfra",
         "//pkg/sql/execinfra/execreleasable",
         "//pkg/sql/execinfrapb",

pkg/sql/colexec/colexecargs/op_creation.go

@@ -19,6 +19,7 @@ import (
 	"github.com/cockroachdb/cockroach/pkg/sql/catalog/descs"
 	"github.com/cockroachdb/cockroach/pkg/sql/colcontainer"
 	"github.com/cockroachdb/cockroach/pkg/sql/colexecop"
+	"github.com/cockroachdb/cockroach/pkg/sql/colmem"
 	"github.com/cockroachdb/cockroach/pkg/sql/execinfra"
 	"github.com/cockroachdb/cockroach/pkg/sql/execinfra/execreleasable"
 	"github.com/cockroachdb/cockroach/pkg/sql/execinfrapb"
@@ -60,9 +61,12 @@ type OpWithMetaInfo struct {
 // NewColOperatorArgs is a helper struct that encompasses all of the input
 // arguments to NewColOperator call.
 type NewColOperatorArgs struct {
-	Spec                 *execinfrapb.ProcessorSpec
-	Inputs               []OpWithMetaInfo
-	StreamingMemAccount  *mon.BoundAccount
+	Spec   *execinfrapb.ProcessorSpec
+	Inputs []OpWithMetaInfo
+	// StreamingMemAccount, if nil, is allocated lazily in NewColOperator.
+	StreamingMemAccount *mon.BoundAccount
+	// StreamingAllocator will be allocated lazily in NewColOperator.
+	StreamingAllocator   *colmem.Allocator
 	ProcessorConstructor execinfra.ProcessorConstructor
 	LocalProcessors      []execinfra.LocalProcessor
 	// any is actually a coldata.Batch, see physicalplan.PhysicalInfrastructure comments.

pkg/sql/colmem/allocator.go

@@ -41,7 +41,6 @@ type Allocator struct {
 	// allocation is denied by acc.
 	unlimitedAcc *mon.BoundAccount
 	factory      coldata.ColumnFactory
-	maxBatchSize int
 }
 
 // SelVectorSize returns the memory usage of the selection vector of the given
@@ -149,18 +148,6 @@ func NewLimitedAllocator(
 	}
 }
 
-// SetMaxBatchSize use this to get more or less than the coldata.BatchSize() default.
-func (a *Allocator) SetMaxBatchSize(siz int) {
-	a.maxBatchSize = siz
-}
-
-func (a *Allocator) getMaxBatchSize() int {
-	if a.maxBatchSize == 0 {
-		return coldata.BatchSize()
-	}
-	return a.maxBatchSize
-}
-
 // NewMemBatchWithFixedCapacity allocates a new in-memory coldata.Batch with the
 // given vector capacity.
 // Note: consider whether you want the dynamic batch size behavior (in which
@@ -238,7 +225,7 @@ func growCapacity(oldCapacity int, minDesiredCapacity int, maxBatchSize int) int
 //
 // The method will grow the allocated capacity of the batch exponentially
 // (possibly incurring a reallocation), until the batch reaches
-// coldata.BatchSize() in capacity or maxBatchMemSize in the memory footprint if
+// maxBatchSize in capacity or maxBatchMemSize in the memory footprint if
 // desiredCapacitySufficient is false. When that parameter is true and the
 // capacity of old batch is at least minDesiredCapacity, then the old batch is
 // reused.
@@ -256,11 +243,12 @@ func growCapacity(oldCapacity int, minDesiredCapacity int, maxBatchSize int) int
 // released, so it is expected that the caller will lose the references to the
 // old batch.
 // Note: the method assumes that minDesiredCapacity is at least 0 and will clamp
-// minDesiredCapacity to be between 1 and coldata.BatchSize() inclusive.
+// minDesiredCapacity to be between 1 and maxBatchSize inclusive.
 func (a *Allocator) resetMaybeReallocate(
 	typs []*types.T,
 	oldBatch coldata.Batch,
 	minDesiredCapacity int,
+	maxBatchSize int,
 	maxBatchMemSize int64,
 	desiredCapacitySufficient bool,
 	alwaysReallocate bool,
@@ -269,8 +257,8 @@ func (a *Allocator) resetMaybeReallocate(
 		colexecerror.InternalError(errors.AssertionFailedf("invalid minDesiredCapacity %d", minDesiredCapacity))
 	} else if minDesiredCapacity == 0 {
 		minDesiredCapacity = 1
-	} else if minDesiredCapacity > a.getMaxBatchSize() {
-		minDesiredCapacity = a.getMaxBatchSize()
+	} else if minDesiredCapacity > maxBatchSize {
+		minDesiredCapacity = maxBatchSize
 	}
 	reallocated = true
 	if oldBatch == nil {
@@ -281,15 +269,15 @@ func (a *Allocator) resetMaybeReallocate(
 		var useOldBatch bool
 		// Avoid calculating the memory footprint if possible.
 		var oldBatchMemSize int64
-		if oldCapacity == a.getMaxBatchSize() {
+		if oldCapacity == maxBatchSize {
 			// If old batch is already of the largest capacity, we will reuse
 			// it.
 			useOldBatch = true
 		} else {
 			// Check that if we were to grow the capacity and allocate a new
 			// batch, the new batch would still not exceed the limit.
 			if estimatedMaxCapacity := truncateToMemoryLimit(
-				growCapacity(oldCapacity, minDesiredCapacity, a.getMaxBatchSize()), maxBatchMemSize, typs,
+				growCapacity(oldCapacity, minDesiredCapacity, maxBatchSize), maxBatchMemSize, typs,
 			); estimatedMaxCapacity < minDesiredCapacity {
 				// Reduce the ask according to the estimated maximum. Note that
 				// we do not set desiredCapacitySufficient to false since this
@@ -335,7 +323,7 @@ func (a *Allocator) resetMaybeReallocate(
 			newBatch = oldBatch
 		} else {
 			a.ReleaseMemory(oldBatchMemSize)
-			newCapacity := growCapacity(oldCapacity, minDesiredCapacity, a.getMaxBatchSize())
+			newCapacity := growCapacity(oldCapacity, minDesiredCapacity, maxBatchSize)
 			newCapacity = truncateToMemoryLimit(newCapacity, maxBatchMemSize, typs)
 			newBatch = a.NewMemBatchWithFixedCapacity(typs, newCapacity)
 		}
@@ -355,7 +343,7 @@ func (a *Allocator) ResetMaybeReallocateNoMemLimit(
 	typs []*types.T, oldBatch coldata.Batch, requiredCapacity int,
 ) (newBatch coldata.Batch, reallocated bool) {
 	newBatch, reallocated, _ = a.resetMaybeReallocate(
-		typs, oldBatch, requiredCapacity, noMemLimit,
+		typs, oldBatch, requiredCapacity, coldata.BatchSize() /* maxBatchSize */, noMemLimit,
 		true /* desiredCapacitySufficient */, false, /* alwaysReallocate */
 	)
 	return newBatch, reallocated
@@ -709,6 +697,9 @@ func GetFixedSizeTypeSize(t *types.T) (size int64) {
 // used.
 type AccountingHelper struct {
 	allocator *Allocator
+	// maxBatchSize determines the maximum size of the batches produced by the
+	// helper in rows (coldata.BatchSize() by default).
+	maxBatchSize int
 	// memoryLimit determines the maximum memory footprint of the batch.
 	memoryLimit int64
 	// maxCapacity if non-zero indicates the target capacity of the batch. It is
@@ -736,6 +727,7 @@ func (h *AccountingHelper) discardBatch(batchMemSize int64) bool {
 // components.
 func (h *AccountingHelper) Init(allocator *Allocator, memoryLimit int64) {
 	h.allocator = allocator
+	h.maxBatchSize = coldata.BatchSize()
 	if memoryLimit == 1 {
 		// The memory limit of 1 most likely indicates that we are in a "force
 		// disk spilling" scenario, but the helper should ignore that, so we
@@ -807,7 +799,7 @@ func (h *AccountingHelper) ResetMaybeReallocate(
 	}
 	var oldBatchReachedMemSize bool
 	newBatch, reallocated, oldBatchReachedMemSize = h.allocator.resetMaybeReallocate(
-		typs, oldBatch, minDesiredCapacity, h.memoryLimit, desiredCapacitySufficient, h.alwaysReallocate,
+		typs, oldBatch, minDesiredCapacity, h.maxBatchSize, h.memoryLimit, desiredCapacitySufficient, h.alwaysReallocate,
 	)
 	if oldBatchReachedMemSize && h.maxCapacity == 0 {
 		// The old batch has just reached the memory size for the first time, so
@@ -924,6 +916,12 @@ func (h *SetAccountingHelper) Init(
 	h.datumVecs = make([]coldata.DatumVec, h.varSizeVecIdxs.Len()-numDecimalVecs)
 }
 
+// SetMaxBatchSize use this to get more or less than the coldata.BatchSize()
+// default.
+func (h *SetAccountingHelper) SetMaxBatchSize(maxBatchSize int) {
+	h.helper.maxBatchSize = maxBatchSize
+}
+
 func (h *SetAccountingHelper) getBytesLikeTotalSize() int64 {
 	var bytesLikeTotalSize int64
 	for _, b := range h.bytesLikeVectors {

pkg/sql/colmem/reset_maybe_reallocate_test.go

@@ -50,13 +50,13 @@ func TestResetMaybeReallocate(t *testing.T) {
 		typs := []*types.T{types.Bytes}
 
 		// Allocate a new batch and modify it.
-		b, _, _ = testAllocator.resetMaybeReallocate(typs, b, coldata.BatchSize(), math.MaxInt64, false /* desiredCapacitySufficient */, false /* alwaysReallocate */)
+		b, _, _ = testAllocator.resetMaybeReallocate(typs, b, coldata.BatchSize(), coldata.BatchSize(), math.MaxInt64, false /* desiredCapacitySufficient */, false /* alwaysReallocate */)
 		b.SetSelection(true)
 		b.Selection()[0] = 1
 		b.ColVec(0).Bytes().Set(1, []byte("foo"))
 
 		oldBatch := b
-		b, _, _ = testAllocator.resetMaybeReallocate(typs, b, coldata.BatchSize(), math.MaxInt64, false /* desiredCapacitySufficient */, false /* alwaysReallocate */)
+		b, _, _ = testAllocator.resetMaybeReallocate(typs, b, coldata.BatchSize(), coldata.BatchSize(), math.MaxInt64, false /* desiredCapacitySufficient */, false /* alwaysReallocate */)
 		// We should have used the same batch, and now it should be in a "reset"
 		// state.
 		require.Equal(t, oldBatch, b)
@@ -83,21 +83,21 @@ func TestResetMaybeReallocate(t *testing.T) {
 		// Allocate a new batch attempting to use the batch with too small of a
 		// capacity - new batch should **not** be allocated because the memory
 		// limit is already exceeded.
-		b, _, _ = testAllocator.resetMaybeReallocate(typs, smallBatch, minDesiredCapacity, smallMemSize, false /* desiredCapacitySufficient */, false /* alwaysReallocate */)
+		b, _, _ = testAllocator.resetMaybeReallocate(typs, smallBatch, minDesiredCapacity, coldata.BatchSize(), smallMemSize, false /* desiredCapacitySufficient */, false /* alwaysReallocate */)
 		require.Equal(t, smallBatch, b)
 		require.Equal(t, minDesiredCapacity/2, b.Capacity())
 
 		oldBatch := b
 
 		// Reset the batch asking for the same small desired capacity when it is
 		// sufficient - the same batch should be returned.
-		b, _, _ = testAllocator.resetMaybeReallocate(typs, b, minDesiredCapacity/2, smallMemSize, true /* desiredCapacitySufficient */, false /* alwaysReallocate */)
+		b, _, _ = testAllocator.resetMaybeReallocate(typs, b, minDesiredCapacity/2, coldata.BatchSize(), smallMemSize, true /* desiredCapacitySufficient */, false /* alwaysReallocate */)
 		require.Equal(t, smallBatch, b)
 		require.Equal(t, minDesiredCapacity/2, b.Capacity())
 
 		// Reset the batch and confirm that a new batch is allocated because we
 		// have given larger memory limit.
-		b, _, _ = testAllocator.resetMaybeReallocate(typs, b, minDesiredCapacity, largeMemSize, false /* desiredCapacitySufficient */, false /* alwaysReallocate */)
+		b, _, _ = testAllocator.resetMaybeReallocate(typs, b, minDesiredCapacity, coldata.BatchSize(), largeMemSize, false /* desiredCapacitySufficient */, false /* alwaysReallocate */)
 		require.NotEqual(t, oldBatch, b)
 		require.Equal(t, minDesiredCapacity, b.Capacity())
 
@@ -108,7 +108,7 @@ func TestResetMaybeReallocate(t *testing.T) {
 			// resetMaybeReallocate truncates the capacity at
 			// coldata.BatchSize(), so we run this part of the test only when
 			// doubled capacity will not be truncated.
-			b, _, _ = testAllocator.resetMaybeReallocate(typs, b, minDesiredCapacity, largeMemSize, false /* desiredCapacitySufficient */, false /* alwaysReallocate */)
+			b, _, _ = testAllocator.resetMaybeReallocate(typs, b, minDesiredCapacity, coldata.BatchSize(), largeMemSize, false /* desiredCapacitySufficient */, false /* alwaysReallocate */)
 			require.NotEqual(t, oldBatch, b)
 			require.Equal(t, 2*minDesiredCapacity, b.Capacity())
 		}

pkg/sql/copy_from.go

@@ -474,9 +474,9 @@ func (c *copyMachine) initVectorizedCopy(ctx context.Context, typs []*types.T) e
 	c.vectorized = true
 	factory := coldataext.NewExtendedColumnFactory(c.p.EvalContext())
 	alloc := colmem.NewLimitedAllocator(ctx, &c.rowsMemAcc, nil /*optional unlimited memory account*/, factory)
-	alloc.SetMaxBatchSize(c.copyBatchRowSize)
 	// TODO(cucaroach): Avoid allocating selection vector.
-	c.accHelper.Init(alloc, c.maxRowMem, typs, false /*alwaysReallocate*/)
+	c.accHelper.Init(alloc, c.maxRowMem, typs, false /* alwaysReallocate */)
+	c.accHelper.SetMaxBatchSize(c.copyBatchRowSize)
 	// Start with small number of rows, compromise between going too big and
 	// overallocating memory and avoiding some doubling growth batches.
 	if err := colexecerror.CatchVectorizedRuntimeError(func() {

pkg/sql/internal.go

@@ -272,6 +272,7 @@ func (ie *InternalExecutor) initConnEx(
 		mode: mode,
 		sync: syncCallback,
 	}
+	clientComm.results = clientComm.resultsScratch[:0]
 	clientComm.rowsAffectedState.rewind = func() {
 		var zero int
 		_ = w.addResult(ctx, ieIteratorResult{rowsAffected: &zero})
@@ -1431,6 +1432,8 @@ type internalClientComm struct {
 	// at any point in time (i.e. any command is created, evaluated, and then
 	// closed / discarded, and only after that a new command can be processed).
 	results []*streamingCommandResult
+	// resultsScratch is the underlying storage for results.
+	resultsScratch [4]*streamingCommandResult
 
 	// The results of the query execution will be written into w.
 	w ieResultWriter

pkg/sql/physicalplan/expression.go

@@ -209,6 +209,10 @@ var _ tree.Visitor = &ivarRemapper{}
 
 func (v *ivarRemapper) VisitPre(expr tree.Expr) (recurse bool, newExpr tree.Expr) {
 	if ivar, ok := expr.(*tree.IndexedVar); ok {
+		if ivar.Idx == v.indexVarMap[ivar.Idx] {
+			// Avoid the identical remapping since it's redundant.
+			return false, expr
+		}
 		newIvar := v.allocIndexedVar()
 		*newIvar = *ivar
 		newIvar.Idx = v.indexVarMap[ivar.Idx]