On 25/07/17 08:53, jianjun.guo wrote: > 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.
Thanks for the further investigation. I've done a quick test with 9.0.x and 8.0.x and I also see this behaviour with 8.0.x but not 9.0.x. I haven't looked deeper to see if it is connector specific or what the root cause might be. I plan to do that next. Mark > ------------------ 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 > --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
