Also, SAS support helped us enable GC logging, and I see this behavior [abridged for clarity]:
{Heap before GC invocations=34 (full 0):
par new generation total 419392K, used 404067K
eden space 372800K, 100% used
from space 46592K, 67% used
to space 46592K, 0% used
2016-07-06T12:36:51 [Times: user=0.05 sys=0.02, real=0.02 secs]
Heap after GC invocations=35 (full 0):
par new generation total 419392K, used 26187K
eden space 372800K, 0% used
from space 46592K, 56% used
to space 46592K, 0% used
372 of our 512 GB memory goes from 0 to 100% in two seconds? This goes back and forth over and over several times, in very short intervals. I'm not fluent in log files, but this seems not good.