Is OpenJDK Platform Binary anything to do with Enterprise. I don't recall seeing this at all before upgrading to 11.3 the other day. It is just eating up a ton of resources.
Yes, 11.3 has this running from the ArcGIS Portal file folders along with the Tomcat webserver.
C:\Program Files\ArcGIS\Portal\framework\runtime\jre\bin
We are running into the same issue. Have you figured anything out? We have an active support case going now.
We just had to bump up the memory on the machine.