RFR: 8200228: Change default value of HeapSizePerGCThread

[Thomas Schatzl]

Hi,

On Wed, 2018-03-28 at 15:52 +0200, Stefan Johansson wrote:
> Hi,
> 
> Please review this change of the default value for
> HeapSizePerGCThread.
> 
> Links
> JBS: https://bugs.openjdk.java.net/browse/JDK-8200228
> Webrev: http://cr.openjdk.java.net/~sjohanss/8200228/00/
> 
> Summary
> My testing shows that for DaCapo, SpecJVM98 and GCBasher (gc
> intensive stress test) with small heaps we get better pause times
> with the flag set to 32M. There might be other arguments, such as not
> using to much resources on small systems that might also be important
> so please let me know if you have reasons why the flag should be left
> unchanged.

  looks good.

Thomas