JDK-8186248 : Allow more flexibility in selecting Heap % of available RAM
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: gc
  • Affected Version: 8u144
  • Priority: P3
  • Status: Resolved
  • Resolution: Fixed
  • Submitted: 2017-08-15
  • Updated: 2024-06-04
  • Resolved: 2017-08-31
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JDK 10
10 b23Fixed
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A customer has asked if it would be possible to specify an option that would allow the VM to select a percentage of available RAM.  This becomes important when running the JVM in a Docker container where the amount of RAM available to a Java process can vary.  The customer would like to use as much available RAM as possible rather than counting on ergonomics to pick the amount for them.

The -XX:Min/MaxRAMFraction options come close to providing what the customer wants but they would either prefer a new set of flags that would represent a % of total rather than a ratio or they would be ok if we change the existing flags to a floating point value.  The new flag could be named -XX:MaxRAMPercentage=xx

URL: http://hg.openjdk.java.net/jdk10/jdk10/hotspot/rev/3ee845ce8ea1 User: jwilhelm Date: 2017-09-03 16:52:11 +0000

URL: http://hg.openjdk.java.net/jdk10/jdk10/rev/32dc808e9918 User: jwilhelm Date: 2017-09-03 16:51:32 +0000

URL: http://hg.openjdk.java.net/jdk10/hs/hotspot/rev/3ee845ce8ea1 User: bobv Date: 2017-08-31 16:10:51 +0000

URL: http://hg.openjdk.java.net/jdk10/hs/rev/32dc808e9918 User: bobv Date: 2017-08-31 16:10:48 +0000

I proposal to add these new flags instead of altering the existing one and will mark the existing flags as deprecated. -XX:MaxRAMPercentage -XX:MinRAMPercentage -XX:InitialRAMPercentage With values ranging from 1 to 100.