In tomcat7 and earlier verison The response content (both response header and body) was put into one buffer before the context will be send to client. So final packet was sent only once commonly.
In tomcat8.0, exactly, aflter svn version 1358055, the feature was removed. when the response was commited, the packet that only contains response header was send to client alonely. For any http request, socket write twicely at the least. ------------------ Original ------------------ From: "Mark Thomas"<ma...@apache.org>; Date: Mon, Jul 24, 2017 09:02 PM To: "Tomcat Users List"<users@tomcat.apache.org>; Subject: Re: The performance reduce much for tomcat 8 ?? On 24/07/17 13:01, jianjun.guo wrote: > thanks for reply . > The same scenario and the same configuration, i test tomcat 8.0.45 and > tomcat 8.5.16 again. > tomcat 8.0.45 and tomcat8.0.32 have almost same performance?? > tomcat 8.5.16 and tomcat7.0.39 have almost same performance?? > Because my test case is very simple http request , big performance > fluctuation may be caused by a little synchronized operation. > > I found it thread stack the synchronized code in InternalNioOutputBuffer.java: > private synchronized void addToBB(..)?? synchronized is must? svn blame is a useful command that can help point to the commit responsible for any given change. Sometimes (as in this case) you need to go back more than one change to the line in question to find the reason for a specific change. Alternatively, you can do the same thing via the viewvc interface. https://svn.apache.org/viewvc/tomcat/tc8.0.x/trunk/ Mark > > > i will test and verify it if the impact come from here. > > > Thanks. > > ------------------ Original ------------------ > From: "Mark Thomas"<ma...@apache.org>; > Date: Mon, Jul 24, 2017 04:29 PM > To: "Tomcat Users List"<users@tomcat.apache.org>; > > Subject: Re: The performance reduce much for tomcat 8 ?? > > > On 24/07/17 09:18, jianjun.guo wrote: >> Hi, >> I deployed a very simple jsp page to test the performance for tomcat7 vs >> tomcat8. >> >> >> The same scenario and the same configuration?? The TPS for tomcat7.0.39 is >> 8.3W, but for tomcat8.0.32 only 6.1W?? >> >> >> There is a big difference for them? Thanks for your help. > > It is hard to comment without knowing the details of the application > that was deployed. > > I don't recognise the units used for the results. > > 7.0.39 was released roughly 3 years earlier than 8.0.32. It is possible > that bug fixes applied to 7.0.x and 8.0.x have impacted performance in > some way. > > It is also over a year since 8.0.32 was released. Performance > differences between the latest 7.0.x and 8.5.x releases (or 9.0.x) are > more likely to be investigated. > > Mark > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
