> From: Konstantin Kolinko [mailto:knst.koli...@gmail.com] > Subject: Re: Performance: switch vs if ... else if > > Regarding "Server VM": I accept it as my mistake. I know, that Client > VM is optimized for faster startup (and, well, it is written in the > FAQ [1]), but I do not know why I thought that slower startup of > Server VM is due to "precompilations".
Both the Client and Server VMs use an interpreter to get things going, which is why the -version option displays "mixed mode" in the signon line. Both JITs compile in the background while methods execute under the interpreter; the client JIT just gets started sooner. You can disable the JIT in either the Client or the Server VM with the -Xint option - and things will run really slowly, but you can single-step through the byte codes this way. Sometime in the future, we'll see the client and server JITs in the same VM, used as a two-stage compilation mechanism (referred to as "tiered compilation"). This is at least partially implemented in 1.6; don't know if it will be enabled in the final release of 1.7 or deferred until a later level (one of the lead guys working on it died of an aneurism last year). - Chuck THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers. --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
