[GitHub] matthiasblaesing commented on issue #1007: [NETBEANS-1605] Removed NetBeans max HeapSize heuristics.

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matthiasblaesing commented on issue #1007: [NETBEANS-1605] Removed NetBeans max HeapSize heuristics.
URL: https://github.com/apache/incubator-netbeans/pull/1007#issuecomment-437692241
 
 
   The documentation does not seem to be correct. From my machine:
   
   ```
   matthias@athena:~$ java -version
   java version "1.8.0_181"
   Java(TM) SE Runtime Environment (build 1.8.0_181-b13)
   Java HotSpot(TM) 64-Bit Server VM (build 25.181-b13, mixed mode)
   matthias@athena:~$ java -XshowSettings 2>&1 | grep Heap
       Max. Heap Size (Estimated): 3.46G
   matthias@athena:~$ 
   matthias@athena:~$ bin/jdk-11/bin/java -version
   openjdk version "11" 2018-09-25
   OpenJDK Runtime Environment 18.9 (build 11+28)
   OpenJDK 64-Bit Server VM 18.9 (build 11+28, mixed mode)
   matthias@athena:~$ bin/jdk-11/bin/java -XshowSettings 2>&1 | grep Heap
       Max. Heap Size (Estimated): 3.89G
   matthias@athena:~$ 
   ```
   
   That is also verified by using JMX on a jrunscript session. The java.lang/Memory/HeapMemoryUsage shows a maximum HeapMemoryUsage of 4173332480.
   
   Given, that the permanent generation was moved offheap, 1/4 of available ram sound like a reasonable size.

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