Yes. I understand the need for capacity planning. It probably involves concurrency, think time analysis etc. I was wondering if maxThreads and MaxClients are the same value. In a worker mpm MaxClients is the Apache setting and maxThreads is the JBoss setting.
Moreover how does a figure of 200 for a core justified. So you mean that the figure of 200 is not based on any analysis. Thanks. From: Daniel Mikusa <dmik...@gopivotal.com> To: "Tomcat Users List" <users@tomcat.apache.org> Date: 09/20/2013 07:10 PM Subject: Re: MaxClients and maxThreads On Sep 20, 2013, at 9:27 AM, mohan.radhakrish...@polarisft.com wrote: > Is this a hard limit ? No. > So if there are 4 cores there can only be 800 > concurrent clients. None of our banks is calculating this like this and > some have Apache and JBoss on the same machine which further limits the > threads. > > Appreciate any help. > > Hi, > I am following the instructions in > https://access.redhat.com/site/articles/15786 to tune MaxClients in > httpd.conf and maxThreads in JBoss Tomcat. > > " The recommended value of maxThreads is 200 per CPU, so here we assume > the server is a single core machine. If it had > been quad core we could push that value to 800 or more depending on RAM > and other machine specs. The total threads > is an aggregate value. If Apache and JBOSS are on the same server, and > that server has four cores, then you would halve > the maxThreads and MaxClients to 400 each." Don't base your performance tuning on values you found in an article online. The author of this article has no idea what kind of hardware you are running, what your application is doing or what your needs are for the application. By these metrics, I should setup 800 threads on a quad core system, but if my application is only supporting 10 users that's way too many. Examine your needs, set the values you think will work and then load test to see how things perform. Adjust the settings further based on your load testing results. Dan > > I have this question. Does this mean that maxThreads and MaxClients should > > both be equal to each other ? > > My configuration is this. > Machine 1 - JBoss and Apache(2 cores) > Machine 2 - JBoss(2 cores) > > So even though Machine 2 can use about 400 threads(200 x 2 ) it is limited > > by MaxClients in Machine 1 which should be only 200. Is that correct ? It > is a bottleneck. > > Thanks, > Mohan > > > This e-Mail may contain proprietary and confidential information and is > sent for the intended recipient(s) only. If by an addressing or > transmission error this mail has been misdirected to you, you are > requested to delete this mail immediately. You are also hereby notified > that any use, any form of reproduction, dissemination, copying, > disclosure, modification, distribution and/or publication of this e-mail > message, contents or its attachment other than by its intended recipient/s > is strictly prohibited. > > Visit us at http://www.polarisFT.com > > > > > This e-Mail may contain proprietary and confidential information and is sent for the intended recipient(s) only. If by an addressing or transmission error this mail has been misdirected to you, you are requested to delete this mail immediately. You are also hereby notified that any use, any form of reproduction, dissemination, copying, disclosure, modification, distribution and/or publication of this e-mail message, contents or its attachment other than by its intended recipient/s is strictly prohibited. > > Visit us at http://www.polarisFT.com --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org This e-Mail may contain proprietary and confidential information and is sent for the intended recipient(s) only. If by an addressing or transmission error this mail has been misdirected to you, you are requested to delete this mail immediately. You are also hereby notified that any use, any form of reproduction, dissemination, copying, disclosure, modification, distribution and/or publication of this e-mail message, contents or its attachment other than by its intended recipient/s is strictly prohibited. Visit us at http://www.polarisFT.com
