Github user jcsalterego commented on a diff in the pull request:
https://github.com/apache/spark/pull/10081#discussion_r53967310
--- Diff:
core/src/main/scala/org/apache/spark/memory/UnifiedMemoryManager.scala ---
@@ -144,8 +150,16 @@ object UnifiedMemoryManager {
* Return the total amount of memory shared between execution and
storage, in bytes.
*/
private def getMaxMemory(conf: SparkConf): Long = {
- val systemMaxMemory = conf.getLong("spark.testing.memory",
Runtime.getRuntime.maxMemory)
+ val systemMemory = conf.getLong("spark.testing.memory",
Runtime.getRuntime.maxMemory)
+ val reservedMemory = conf.getLong("spark.testing.reservedMemory",
+ if (conf.contains("spark.testing")) 0 else
RESERVED_SYSTEM_MEMORY_BYTES)
+ val minSystemMemory = reservedMemory * 1.5
+ if (systemMemory < minSystemMemory) {
+ throw new IllegalArgumentException(s"System memory $systemMemory
must " +
+ s"be at least $minSystemMemory. Please use a larger heap size.")
--- End diff --
This comes out as scientific notation, which made me laugh.
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