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On 6/12/17 3:43 PM, Piyush Kumar Nayak wrote: > Sure, I'll check it out and get back. But the last time I tried, > JMeter gave me better numbers than ab. Don't want the client to be > the bottleneck. +1 ab evidently doesn't "do" high-concurrency very well. Something about a single global-lock. Mladen and Jean-Frederic have more information about it than I do. - -chris > -----Original Message----- From: Mark Thomas > [mailto:ma...@apache.org] Sent: Tuesday, June 13, 2017 1:05 AM To: > Tomcat Users List <users@tomcat.apache.org> Subject: Re: Tomcat > 8/NIO performance discrepancies > > On 12/06/17 20:27, Piyush Kumar Nayak wrote: >> Thanks, Mark. I have been testing with 100 concurrent users. >> While the executor had the maxThreads set to 150, the connector >> without the executor was left to the default value (which should >> be 200). I did not have the disableKeepAlivePercentage attribute >> set, which means that it should take to the default value of 75. >> >> So, the number of threads in use before the keepalive is disabled >> in case of non-executor connector should be 150. At 100 users, >> the no. of clients is at 50% of the maxThread count. Unless I'm >> missing something here, I don't see why keep-alive would be >> disabled. I'd appreciate if you can give me some pointers on how >> you can tell if requests are processed at the server end with >> keep-alive. > > I suggest you use ab rather than JMeter. I've seen all sorts of odd > behaviour with JMeter when processing requests very quickly that I > haven't seen with ab. Also, ab tells you how many of your requests > used keep-alive. > > Mark > > >> >> I'll try setting disableKeepAlivePercentage to 100, and see if >> that improves the performance. >> >> -----Original Message----- From: Mark Thomas >> [mailto:ma...@apache.org] Sent: Thursday, June 08, 2017 7:13 PM >> To: Tomcat Users List <users@tomcat.apache.org> Subject: Re: >> Tomcat 8/NIO performance discrepancies >> >> On 07/06/17 22:28, Mark Thomas wrote: >> >> <snip/> >> >>> I'm still seeing significant differences in BIO with and >>> without an executor. >>> >>> I'm still looking for the root cause. I have noticed that >>> without an executor I see far fewer keep-alive requests than >>> I'd expect. That could explain the difference, or some of it at >>> least. >> >> Further testing indicates that most, if not all, of the >> performance difference is down to the fewer number of requests >> processed using HTTP keep-alive. This is because BIO without an >> executor is subject to disableKeepAlivePercentage whereas BIO >> with an executor is not. >> >> If the number of concurrent clients is kept below 75% of >> maxThreads, performance remains very similar. >> >> The problems you are likely to experience in the real world >> without disableKeepAlivePercentage (i.e. if you use BIO with an >> executor) are described in this thread: >> >> https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Ftomca t >> >> .markmail.org%2Fthread%2Fmcfdk2273v2fsh5k&data=02%7C01%7C%7C6816158122 >> aa4914b20208d4ae744a1e%7Cfa7b1b5a7b34438794aed2c178decee1%7C0%7C0%7C6 3 >> >> 6325261860429837&sdata=8t1j6lxgc3aTCDq45mXbH7LqedtIuRgPsrgqUKXyCrc%3D& >> reserved=0 >> >> The better tuning options are probably: - increase maxThreads to >> max expected client concurrency + headroom or if your memory/CPU >> won't permit that, as high as you can - increase >> disableKeepAlivePercentage >> >> I'll look at BIO vs NIO next. >> >> 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 > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > -----BEGIN PGP SIGNATURE----- Comment: GPGTools - http://gpgtools.org Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQIcBAEBCAAGBQJZPvXxAAoJEBzwKT+lPKRYCb8QAL555dkQlFCPEXsjqtP7IGIA 7eQjX7gE1Lxk3ycCmTcndyixFWGoGdLwp41OPadVYF9TSe003fiHbptiSsYgCCEM HEOMisKNkVZg22Wyenm0eJLPaALMOE7xU95rmPpacVxgslPWmMLSsNk9TC/c2xQ1 1o7iiS9/hEF6LsoT5oOLxe/ZGp8jxTHXBgahvqCierzN8T089G7GomVS1Q/FDD2t OLOu/JRcTUKzxlISONbchtF1fSc9HenLmrZxqVw52iZGLGrbsIAg8D/x7kPhAxbk HLHG9GwkHh7iOavW25UWFVVlmC58XioDJJVZWTGzEhfxAU/zoyUZbZ2CtqSDTdUG rcsBjk33A1LYc3yioq8i55fq7d84cLdG2Xf//kUaBq+yP3tuNpWYk/WEOL/kuQFp IY1z+QykqF1Agfiubc8GyDWhyBvi2+g0uX09796STLfQdk1eC6+aPIpFOtrTh2ou a8H73w73nJ2R04GnqBm9T+RFJSvjR9HGZ8mGoFYypMeK0qJXOn7t1CVK6/bX7d9n J4Op5AyncpSlnqRCofMk4zSYGUasKR6BXtZ+2pu+5McnjndHLnUdGAfwy9ReD5fi 5McU18S7EUlvRaXt5pgO9RSDRilm3J+Ar0rGFlSBNmanFTvlgCdKYPTAWmkTcbGW AOvM4/3itRoZi7DBtEdg =0H+N -----END PGP SIGNATURE----- --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
