Update time measurement of metrics for proposal builder in 1:n (#6268)

## Motivation

This updates how timing metrics for the proposal builder are calculated.

Author: fasmat

miner/metrics.go

@@ -18,24 +18,26 @@ var proposalBuild = metrics.NewHistogramWithBuckets(
 ).WithLabelValues()
 
 type latencyTracker struct {
-	start    time.Time
-	data     time.Time
-	tortoise time.Time
-	txs      time.Time
-	hash     time.Time
-	publish  time.Time
+	start time.Time
+	end   time.Time
+
+	data     time.Duration
+	tortoise time.Duration
+	hash     time.Duration
+	txs      time.Duration
+	publish  time.Duration
 }
 
 func (lt *latencyTracker) total() time.Duration {
-	return lt.publish.Sub(lt.start)
+	return lt.end.Sub(lt.start)
 }
 
 func (lt *latencyTracker) MarshalLogObject(encoder zapcore.ObjectEncoder) error {
-	encoder.AddDuration("data", lt.data.Sub(lt.start))
-	encoder.AddDuration("tortoise", lt.tortoise.Sub(lt.data))
-	encoder.AddDuration("hash", lt.hash.Sub(lt.tortoise))
-	encoder.AddDuration("txs", lt.txs.Sub(lt.hash))
-	encoder.AddDuration("publish", lt.publish.Sub(lt.hash))
+	encoder.AddDuration("data", lt.data)
+	encoder.AddDuration("tortoise", lt.tortoise)
+	encoder.AddDuration("hash", lt.hash)
+	encoder.AddDuration("txs", lt.txs)
+	encoder.AddDuration("publish", lt.publish)
 	total := lt.total()
 	encoder.AddDuration("total", total)
 	// arbitrary threshold that we want to highlight as a problem

miner/proposal_builder.go

@@ -558,7 +558,9 @@ func (pb *ProposalBuilder) initSignerData(
 }
 
 func (pb *ProposalBuilder) build(ctx context.Context, lid types.LayerID) error {
-	start := time.Now()
+	for _, ss := range pb.signers.signers {
+		ss.latency.start = time.Now()
+	}
 	if err := pb.initSharedData(ctx, lid); err != nil {
 		return err
 	}
@@ -571,8 +573,8 @@ func (pb *ProposalBuilder) build(ctx context.Context, lid types.LayerID) error {
 	var eg errgroup.Group
 	eg.SetLimit(pb.cfg.workersLimit)
 	for _, ss := range signers {
-		ss.latency.start = start
 		eg.Go(func() error {
+			start := time.Now()
 			if err := pb.initSignerData(ctx, ss, lid); err != nil {
 				if errors.Is(err, errAtxNotAvailable) {
 					ss.log.Debug("smesher doesn't have atx that targets this epoch",
@@ -591,14 +593,15 @@ func (pb *ProposalBuilder) build(ctx context.Context, lid types.LayerID) error {
 				)
 			}
 			ss.session.prev = lid
-			ss.latency.data = time.Now()
+			ss.latency.data = time.Since(start)
 			return nil
 		})
 	}
 	if err := eg.Wait(); err != nil {
 		return err
 	}
 
+	start := time.Now()
 	any := false
 	for _, ss := range signers {
 		if n := len(ss.session.eligibilities.proofs[lid]); n == 0 {
@@ -629,14 +632,16 @@ func (pb *ProposalBuilder) build(ctx context.Context, lid types.LayerID) error {
 		return fmt.Errorf("encode votes: %w", err)
 	}
 	for _, ss := range signers {
-		ss.latency.tortoise = time.Now()
+		ss.latency.tortoise = time.Since(start)
 	}
 
+	start = time.Now()
 	meshHash := pb.decideMeshHash(ctx, lid)
 	for _, ss := range signers {
-		ss.latency.hash = time.Now()
+		ss.latency.hash = time.Since(start)
 	}
 
+	start = time.Now()
 	for _, ss := range signers {
 		proofs := ss.session.eligibilities.proofs[lid]
 		if len(proofs) == 0 {
@@ -654,7 +659,7 @@ func (pb *ProposalBuilder) build(ctx context.Context, lid types.LayerID) error {
 		)
 
 		txs := pb.conState.SelectProposalTXs(lid, len(proofs))
-		ss.latency.txs = time.Now()
+		ss.latency.txs = time.Since(start)
 
 		// needs to be saved before publishing, as we will query it in handler
 		if ss.session.ref == types.EmptyBallotID {
@@ -667,6 +672,7 @@ func (pb *ProposalBuilder) build(ctx context.Context, lid types.LayerID) error {
 		}
 
 		eg.Go(func() error {
+			start := time.Now()
 			proposal := createProposal(
 				&ss.session,
 				pb.shared.beacon,
@@ -686,7 +692,8 @@ func (pb *ProposalBuilder) build(ctx context.Context, lid types.LayerID) error {
 					zap.Error(err),
 				)
 			} else {
-				ss.latency.publish = time.Now()
+				ss.latency.publish = time.Since(start)
+				ss.latency.end = time.Now()
 				ss.log.Info("proposal created",
 					log.ZContext(ctx),
 					zap.Inline(proposal),

miner/proposal_builder_test.go

@@ -891,7 +891,7 @@ func TestMarshalLog(t *testing.T) {
 		require.NoError(t, session.MarshalLogObject(encoder))
 	})
 	t.Run("latency", func(t *testing.T) {
-		latency := &latencyTracker{start: time.Unix(0, 0), publish: time.Unix(1000, 0)}
+		latency := &latencyTracker{start: time.Unix(0, 0), end: time.Unix(1000, 0)}
 		require.NoError(t, latency.MarshalLogObject(encoder))
 	})
 }