Hi Chris, I was monitoring the CPU utilization specifically. I can compromise on 10000 less transactions/sec,but 80-90% utilization is not good.
I tested the Async Servlet and the Hello World Servlet with the same environment and the client. Hello world servlet gave 20k req/sec and on the other hand Async Servlet was only 100 req/sec even less during the course. Both the results with 100 threads. I have configured 1000 max threads in the connector,and I am testing with 100 concurrent threads. Well I tested a sample html page with Tomcat 6.0.18 and 7.0.30 on Solaris x86 server. The req/sec were almost the same for both,but CPU utilization for Tomcat 6 was 23-27% and for Tomcat 7 it was 80-90% consistently. On the other hand on a Linux system,the req/sec were a little higher in Tomcat 7 say 65k to 55k on tomcat 6 and the CPU utilization was the same for both 6 and 7. My Jprofiler stack trace on Solaris is a lot different. As far as I have observed,for Tomcat 7 the stack Trace leads me to ResponseFacade.setContentType,which was not the behaviour in Tomcat 6. Can that be a bottleneck? Or is there something platform dependent that I should take care of? Thanks. ________________________________ From: Christopher Schultz <ch...@christopherschultz.net> To: Tomcat Users List <users@tomcat.apache.org> Sent: Tuesday, 21 May 2013 9:08 PM Subject: Re: Performance Issue while upgrading from Embedded Tomcat 6 to Tomcat 7 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Chirag, On 5/20/13 10:38 AM, Chirag Dewan wrote: > I ran my test client on Hello World example servlet on Tomcat > 7.0.30. It was 12K req/sec with 80% CPU utilization. > > The same test case on tomcat 6.0.18 gave me similar req/sec but > CPU utilization of 70% . The results on my linux server,with client > and server running on the same machine. But all I am doing is > comparing the 2 instances in the same environement. Running both client and server on the same machine is not a great test if you want to determine the server load by looking at CPU utilization. Were you looking at overall CPU utilization, or just utilization of the Tomcat JVM process? > I am pretty sure the utilization is due to the server. > > The Jprofiler shows a lot of logging threads in tomcat consuming a > lot of memory. Something I should be careful about? Can you be more specific? AFAIK, there are no "logging threads" in Tomcat at all. > Also I ran an asynchronous servlet with the same client. The > trans/sec reduced drastically,but the CPU utilization was only 4% I would expect a small reduction in trans/sec when using async, but nothing I would describe as "drastic". Can you give us some numbers? > Are there too may threads waiting for connection? Would thread > pooling help, if we can? I think you mean "too many connections waiting for a thread" instead of the other way around. Threads are already pooled. What are your <Connector> configuration details, and what are the parameters for your load test? If you only have 10 connections configured, launching 10,000 clients isn't exactly a fair test. - -chris -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.0.17 (Darwin) Comment: GPGTools - http://gpgtools.org Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQIcBAEBCAAGBQJRm5UNAAoJEBzwKT+lPKRYKoEQAJeWY07c4jr1prAqvdrOyR4X X9CaWrZ4DwvsKuSn2NtZgXqf5lcLhsDzgP3Ej6cNhBx7WcK6zy8zpTZ2RdVo+YOB 1fGfdpZ6rMODT3i2UI8mAQmbG54NwA4C40ShsTpYVtdXb4GfAX+81j8HqtClr5Tf NEBq2xu4LJDc0ajE4mh+Vyr3M3wUG5CEsQAKhj3Owddtus6sltbrBs8116ZzcpQt 10COnt/e08ikyUVuAYxGZPvQ+rwhlFWuvTf0NlG9/oZSDxSb19KcdZ+vMi2HTNQr McQpVxd2RtqpTgM2NJ3uTS6rQ7R4I1moP96DOgNrU6jS2u5sJVoH98weq4AU4uxa 5sXJG4N4eaVsaFE9m2Nio3zgXZDObmF2jh1df79d7TzHkcIJHjtbZ9VHf1gLVqoW v2pWVU+7di6MiDg7P1Y8y2pXwYYF13ZVx6uozyfv6hGuGXDZkMmmg0QatpKguVXl sO3idan5klic3RJJg2zduq6PUlJZyqJJulqJas1DoUHARo6pSDkZWy1hYZQC9BGT dHgmxrA4Jo5Npq1VpiNMCXl/wCT2vKdsseqsCEQN4EIvgJWuZ5l8NkZtceQTPXtE 4CEcsSd83hIDmichkhVw3PoNHKSSFGwdRRI5sEXqW1Vv88Vj7ldtD8518vJUoQLu s2xIFlQjkJKW/W46Y+on =2P5W -----END PGP SIGNATURE----- --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
