From 6ae05b419922193c4c253e51c9a5e483e4f947fa Mon Sep 17 00:00:00 2001
From: janakr <janakr@google.com>
Date: Mon, 13 Aug 2018 16:13:42 -0700
Subject: Order Skyframe evaluations in a priority queue, with all children of
 a given node having the same priority, later enqueueings having higher
 priority, re-enqueued nodes having highest priority, and new root nodes
 having lowest priority. Experimentally, this can save significant RAM (1.4G
 in some builds!) while not affecting speed.

Also do a semi-drive-by deleting ExecutorFactory parameter to AbstractQueueVisitor, since it was always AbstractQueueVisitor.EXECUTOR_FACTORY.

PiperOrigin-RevId: 208560889
---
 .../build/skyframe/ParallelEvaluatorContext.java      | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

(limited to 'src/main/java/com/google/devtools/build/skyframe/ParallelEvaluatorContext.java')

diff --git a/src/main/java/com/google/devtools/build/skyframe/ParallelEvaluatorContext.java b/src/main/java/com/google/devtools/build/skyframe/ParallelEvaluatorContext.java
index 60987ac7f2..db2afd10e5 100644
--- a/src/main/java/com/google/devtools/build/skyframe/ParallelEvaluatorContext.java
+++ b/src/main/java/com/google/devtools/build/skyframe/ParallelEvaluatorContext.java
@@ -13,7 +13,6 @@
 // limitations under the License.
 package com.google.devtools.build.skyframe;
 
-import com.google.common.base.Function;
 import com.google.common.base.Preconditions;
 import com.google.common.base.Supplier;
 import com.google.common.base.Suppliers;
@@ -73,7 +72,7 @@ class ParallelEvaluatorContext {
       final DirtyTrackingProgressReceiver progressReceiver,
       EventFilter storedEventFilter,
       ErrorInfoManager errorInfoManager,
-      final Function<SkyKey, Runnable> runnableMaker,
+      RunnableMaker runnableMaker,
       GraphInconsistencyReceiver graphInconsistencyReceiver,
       final int threadCount) {
     this(
@@ -101,7 +100,7 @@ class ParallelEvaluatorContext {
       final DirtyTrackingProgressReceiver progressReceiver,
       EventFilter storedEventFilter,
       ErrorInfoManager errorInfoManager,
-      final Function<SkyKey, Runnable> runnableMaker,
+      RunnableMaker runnableMaker,
       GraphInconsistencyReceiver graphInconsistencyReceiver,
       final ForkJoinPool forkJoinPool,
       EvaluationVersionBehavior evaluationVersionBehavior) {
@@ -120,6 +119,18 @@ class ParallelEvaluatorContext {
         evaluationVersionBehavior);
   }
 
+  /**
+   * Returns a {@link Runnable} given a {@code key} to evaluate and an {@code evaluationPriority}
+   * indicating whether it should be scheduled for evaluation soon (higher is better). The returned
+   * {@link Runnable} is a {@link ComparableRunnable} so that it can be ordered by {@code
+   * evaluationPriority} in a priority queue if needed.
+   */
+  interface RunnableMaker {
+    ComparableRunnable make(SkyKey key, int evaluationPriority);
+  }
+
+  interface ComparableRunnable extends Runnable, Comparable<ComparableRunnable> {}
+
   private ParallelEvaluatorContext(
       QueryableGraph graph,
       Version graphVersion,
@@ -174,7 +185,7 @@ class ParallelEvaluatorContext {
         for (SkyKey key : keys) {
           NodeEntry entry = Preconditions.checkNotNull(batch.get(key), key);
           if (entry.signalDep(version)) {
-            getVisitor().enqueueEvaluation(key);
+            getVisitor().enqueueEvaluation(key, Integer.MAX_VALUE);
           }
         }
         return;
-- 
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