-----Original Message----- From: Mark Thomas [mailto:ma...@apache.org] Sent: Thursday, February 12, 2015 7:35 AM To: Tomcat Users List Subject: Re: Help required to calculate Apache Tomcat resource
Email sent from outside of PSEG. Use caution before using links/attachments. On 12/02/2015 12:19, Paul, Subhro wrote: > Dear Team, > > I am an application developer from TCS and working for PSEG > (https://www.pseg.com). > > We are using Apache Tomcat6 as application server for the website. > Two virtual servers are configured for this and each one of the > servers had 2 CPUs and 4 GB RAM until 26 JAN 2015 when both Tomcat > servers crashed. So we added some resources to the virtual servers > (Now it is 8CPUs and 8GB RAM each box) and increased maxThread > parameter of tomcat from default (which is 200) to 300 and restarted > Tomcat servers. OS of the systems are Linux6.5 . > > We need to know what the relationship between thread and memory is. > If N numbers of requests coming to the server how many threads can > process that and how much memory is required for that. Actually we > are targeting to increase the maxThread count upto 500 but we need to > calculate that, to process this much of threads what will be the best > Hardware configuration? > > Please let us know if any more information is required for the same. You only need to send your message once. Sending the same message repeatedly tends to annoy people and reduces the chances of you getting a response. There is no way for anyone here to provide the information you are looking for. By far the largest determining factor is your application and the only person with the information about that is you. You need to do some testing with a profiler to work out the information you are looking for. To re-enforce the point I have one customer where a 2-core machine with 1GB ram was configured with maxThread=2000 and was serving requests with pretty much all of them without breaking a sweat. I have another customer where a 4-core machine with 16GB ram will fall over with more than 5 concurrent users. Mark --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org Hi Mark, Thanks for your reply. By miss I sent the first e-mail in HTML format which could be rejected as described in Apache Tomcat mailing list help so I send the second e-mail in plain text format. I will keep your advice in mind. Yes. I completely agree with you that we need to do some testing to identify the required resources to support and fulfill user expectation and also this vary from application to application but is there any default calculation present with tomcat? Like, to process output of 1 'X' KB(total response page size)request 1 thread require 'Y' MB of RAM with 'A' core 'Z.ZZ' Ghz processor. Practically this may differ but if we get theoretical help on this, then before going any testing we may justify some resource requirement to client. Thanks, Subhro Paul ----------------------------------------- The information contained in this e-mail, including any attachment(s), is intended solely for use by the named addressee(s). If you are not the intended recipient, or a person designated as responsible for delivering such messages to the intended recipient, you are not authorized to disclose, copy, distribute or retain this message, in whole or in part, without written authorization from PSEG. This e-mail may contain proprietary, confidential or privileged information. If you have received this message in error, please notify the sender immediately. This notice is included in all e-mail messages leaving PSEG. Thank you for your cooperation. --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
