After logged in with ~800 concurrent users openfire use ~300M memory.
While changing clients use much memory ~2G. After logged out with all clients openfire not reduce memory load.
Java is configured to only release memory when it needs it. Are you getting out of memory errors in the server? I don’'t understand what you mean by, “While changing clients use much memory ~2G”?
When java use 2G memory my server have 400 load.
“While changing clients use much memory ~2G” - Any clients logout and other clients login.