Still doesn't answer the question. In Java, allocate 8 gigs. Free 7 gigs. Why still 8 gigs? I didn't ask anything about if I could run a 1 gig process here.
> java -XX:MinHeapFreeRatio=5 -XX:MaxHeapFreeRatio=10 test.java
used=7640 MB, committed=7668 MB, max=8192 MB
used=4 MB, committed=20 MB, max=8192 MB
used=3 MB, committed=8 MB, max=8192 MB
used=3 MB, committed=8 MB, max=8192 MB