[GitHub] [spark] LuciferYang commented on a diff in pull request #40440: [SPARK-42808][CORE] Avoid getting availableProcessors every time in `MapOutputTrackerMaster#getStatistics`

["LuciferYang (via GitHub)" <gi...@apache.org>]

LuciferYang commented on code in PR #40440:
URL: https://github.com/apache/spark/pull/40440#discussion_r1137081654


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core/src/main/scala/org/apache/spark/MapOutputTracker.scala:
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@@ -697,6 +697,8 @@ private[spark] class MapOutputTrackerMaster(
     pool
   }
 
+  private val availableProcessors = Runtime.getRuntime.availableProcessors()

Review Comment:
   1. How much time can be saved?
   2. There are 10+places in Spark that use `Runtime.getRuntime.availableProcessors()`. Is it possible to expand the scope of benefits?



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