hi, peter thank you for your reply. I think -d64 caused too much unnecessary memory, but I can not simplely get -d64 away, because i use Timesten and jboss need to load 64bit timesten lib by starting. and also , i start to suspect that Solaris didnot take my -Xss opt at all, there are 157 threads runing in system and my System stack size is 8M , plus the stupid -d64 , is that 5.5 memory usage resonable? it is realy wired.... View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4166102#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...