srowen commented on a change in pull request #34846:
URL: https://github.com/apache/spark/pull/34846#discussion_r766851255
##########
File path: core/src/main/scala/org/apache/spark/internal/config/package.scala
##########
@@ -2267,4 +2267,12 @@ package object config {
.version("3.3.0")
.intConf
.createWithDefault(5)
+
+ private[spark] val MEMORY_ONHEAP_PAGESIZE_OPTIMIZE_ENABLED =
Review comment:
Do we need a flag for this? when would I not want it?
##########
File path: core/src/main/scala/org/apache/spark/util/Utils.scala
##########
@@ -3204,6 +3205,33 @@ private[spark] object Utils extends Logging {
}
files.toSeq
}
+
+ private def isG1GarbageCollector: Boolean = {
+ val gcs = ManagementFactory.getGarbageCollectorMXBeans.asScala
+ gcs.exists(_.getName.equalsIgnoreCase("G1 Young Generation")) ||
+ gcs.exists(_.getName.equalsIgnoreCase("G1 Old Generation"))
+ }
+
+ /**
+ * Return true if current GC algorithm is G1 GC and the requested sizeInBytes
+ * are larger than 50% of the region size in G1.
+ */
+ def isHumongousAllocation(sizeInBytes: Long): Boolean = {
+ if (isG1GarbageCollector) {
+ try {
+ val heapRegionSize = ManagementFactory
+ .getPlatformMXBean(classOf[HotSpotDiagnosticMXBean])
+ .getVMOption("G1HeapRegionSize").getValue.toLong
+ sizeInBytes > (heapRegionSize / 2)
+ } catch {
+ case t: Throwable =>
+ logWarning("Try to get G1HeapRegionSize failed. ", t)
+ false
Review comment:
Just merge both false lines into one at the end
##########
File path: core/src/main/scala/org/apache/spark/util/Utils.scala
##########
@@ -3204,6 +3205,33 @@ private[spark] object Utils extends Logging {
}
files.toSeq
}
+
+ private def isG1GarbageCollector: Boolean = {
+ val gcs = ManagementFactory.getGarbageCollectorMXBeans.asScala
+ gcs.exists(_.getName.equalsIgnoreCase("G1 Young Generation")) ||
Review comment:
Nit: you could make this one exists() statement
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