Hello all;

A lot more people have been playing with using concurrency lately with JTReg 
and most have found that tests will frequently fail or error out because of OOM 
errors. The problem is that the jdk/test/Makefile currently doesn't specify a 
size for the vm instances used for running tests. This results in "VM 
Ergonomics" sizing being used and the test VMs which get created are generally 
too large to run very many of them.

This patch sets a specific size to the vm instances created to run tests, 
512MB. This value has been successfully used to run tests by our internal SQE 
team and by Alan Bateman for quite some time. It also seems to work for me. 
Individual tests which require more memory can specify their requirements using 
explicit -Xmx options in @run tags.

http://cr.openjdk.java.net/~mduigou/JDK-8014819/0/webrev/

Thanks,

Mike

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