Re: Please help me improve my question skills (number of tomcat a pps)
Knutsen Jeffrey S wrote: YES! You've hit it! I AM asking the question about how fast the car will go. At this time, I DON'T care about the type of car or engine! My question is being analyzed far too deeply by the diligent developers on this mail list. snip Well, although I agree with other posters that answering your question will not provide you with any useful information, here goes... I am developing a REAL application using Tomcat. Development is on a G3 PowerBook running Mac OS X 10.1.5, Tomcat 4.0.3 standalone, and MySQL something or other (recent, anyway!) with mm.MySQL JDBC driver. Performance is very good. Production will be on some kind of Sun box which also runs Samba (masquerades as an NT server) for local workgroup. Production DB will be Oracle 8i, which will probably slow down the app somewhat, but still confident the car will go fast enough! Now, apart from the information that the Mac is an excellent platform for Java apps, I don't know how this helps you, but hey... :-) Martin -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
RE: Please help me improve my question skills (number of tomcat a pps)
Jeff - We are using Tomcat to provide a Web front end for a mainframe application -- so at most two or three clients at once hitting the server. The box is Win2K or WinNT 4. The application is a bunch of JSPs and a couple of Java Beans which use TCP/IP to talk to the MF. We are not quite released but the Beta code has been running very nicely in Tomcat 3.3.x and 4.0.x for 3 or 4 months now. Everyone that has seen it has been impressed. Does that help? Roger Whitcomb Computer Associates Senior Software Engineer Development Phone: +1 408 965 8653 FAX: +1 408 965 8805 [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] -Original Message- From: Knutsen Jeffrey S [mailto:[EMAIL PROTECTED]] Sent: Tuesday, June 11, 2002 9:20 AM To: Tomcat Users List Subject: RE: Please help me improve my question skills (number of tomcat a pps) YES! You've hit it! I AM asking the question about how fast the car will go. At this time, I DON'T care about the type of car or engine! My question is being analyzed far too deeply by the diligent developers on this mail list. The type of responses I was hoping for would have had developers proudly boasting something like: At my company we are successfully running 17 applications in two TC instances or We are running one TC instance with four apps or We have one app. I am not interested in app type or size or anything like that. Based on the information I have seen, I should be forced to conclude that TC is not being used for any real applications, but I KNOW this can not be true - there are far too many intelligent and competent people monitoring the mail list. Unfortunately (for me), no one has yet proclaimed success. I understand that when it comes time to actually implement TC, the questions regarding OS, JVM, type of apps, etc will become VERY important. But I need to try to make some justifications before I can ever get to that point. Thanks all for all your help! -- Jeff -Original Message- From: Adrian [mailto:[EMAIL PROTECTED]] Sent: Monday, June 10, 2002 7:32 PM To: Tomcat Users List Subject: Re: Please help me improve my question skills (number of tomcat apps) Your question cannot be answered without specifying criteria. 1) OS type 2) JVM type 3) Type and Complexity of Application 4) Are you using connectors 5) Are you connecting to databases Your current question is like asking how fast and how far will a car go. I don`t care what kind of car, or engine. Adrian - Original Message - From: Knutsen Jeffrey S [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Monday, June 10, 2002 9:48 AM Subject: Please help me improve my question skills (number of tomcat apps) I have submitted the following question and received no response. I know this isn't a technical problem, but I was hoping for responses from real developers. I thought it was a simple question, and have always received excellent and quick responses from the tomcat mail list in the past, so the problem must be with me or the way I am asking. Can someone please help me improve myself? Is this a stupid question? Have I perhaps asked it incorrectly? I am open and receptive to any constructive criticism available (I can take it, but maybe you could send a direct response if you want to be extremely brutal?!) All I really want to know is how many applications real developers are putting on one machine in the real world. I am just looking for an abstract number, and I am not worried about system configurations at this time. Thanks! ORIGINAL QUESTION: I am doing some Tomcat cost/benefit projections for my company. I need to determine the maximum number of applications that will run on Tomcat and still provide stable performance. I am not interested in a theoretical number at this time, just seeking information about what real developers are actually doing with real applications. At this time, I am not interested in what machine types, OSs, configurations, versions, are being used. I understand the answer to my questions will depend heavily on these issues as well as on the applications themselves. I just need to come up with a realistic number of instances/apps which are being run on a single machine by real users. I am seeking an answer to the following two questions: Number of Tomcat instances I am running on one machine: Number of individual applications I am running in all instances of Tomcat on one machine: Please feel free to respond to the mail list, or to me directly at [EMAIL PROTECTED] (if we don't want to clog the list with answers to this question). I will post a final resolution message to the mail list when I have come to some sort of conclusion. Thanks in advance for your help! -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED
Re: Please help me improve my question skills (number of tomcat a pps)
Hi, So the question reduces to:- 1. What are the extra memory requirements for a virtual host/context? 2. How much longer does it take to decide on a servlet/jsp to invoke for an extra virtual host/context? From my (limited) understanding of Tomcat, I would say the answer to both of these questions is negligible compared to the memory/overhead of processing a typical request. So your question reduces to how many requests can be processed by your instance, and that depends very much on your application. The distribution of the requests amongst the applications shouldm't matter. Can somebody more knowledgeable confirm the extra resource requirements for virtual hosts/contexts. Regards, Arshad - Original Message - From: Knutsen Jeffrey S [EMAIL PROTECTED] To: 'Tomcat Users List' [EMAIL PROTECTED] Sent: Monday, June 10, 2002 4:37 PM Subject: RE: Please help me improve my question skills (number of tomcat a pps) Thanks very much for the help. I do understand that there are many variables that will affect the answer to this question. At this time, all I am really after is what is the best that anyone has done, in any configuration. I am interested in real-world successes. Thanks again! -Original Message- From: Craig R. McClanahan [mailto:[EMAIL PROTECTED]] Sent: Monday, June 10, 2002 10:33 AM To: Tomcat Users List Subject: Re: Please help me improve my question skills (number of tomcat apps) On Mon, 10 Jun 2002, Knutsen Jeffrey S wrote: Date: Mon, 10 Jun 2002 08:48:39 -0500 From: Knutsen Jeffrey S [EMAIL PROTECTED] Reply-To: Tomcat Users List [EMAIL PROTECTED] To: '[EMAIL PROTECTED]' [EMAIL PROTECTED] Subject: Please help me improve my question skills (number of tomcat apps) I have submitted the following question and received no response. I know this isn't a technical problem, but I was hoping for responses from real developers. I thought it was a simple question, and have always received excellent and quick responses from the tomcat mail list in the past, so the problem must be with me or the way I am asking. Can someone please help me improve myself? Is this a stupid question? Have I perhaps asked it incorrectly? I am open and receptive to any constructive criticism available (I can take it, but maybe you could send a direct response if you want to be extremely brutal?!) All I really want to know is how many applications real developers are putting on one machine in the real world. I am just looking for an abstract number, and I am not worried about system configurations at this time. The problem is that there is no generally useful answer to your question as stated. It depends even more on the nature of the applications you are talking about (when the answer might even be zero for a particular server configuration) as the size of the server (an answer based on a 64-CPU mega-server with 4 gigabytes of main memory isn't going to help you on a small single-CPU Linux box with 64 megs). There are no architectural limits on the number of webapps a single Tomcat instance can support, or the number of Tomcat instances on a single server. It all comes down to what resource bottlenecks you run into first in your application environment. In many webapp environments, the first bottleneck encountered is often database access, followed by the number of simultenaous requests being processed. Neither of those bottlenecks has much directly to do with how many different webapps you are talking about. Thanks! Craig ORIGINAL QUESTION: I am doing some Tomcat cost/benefit projections for my company. I need to determine the maximum number of applications that will run on Tomcat and still provide stable performance. I am not interested in a theoretical number at this time, just seeking information about what real developers are actually doing with real applications. At this time, I am not interested in what machine types, OSs, configurations, versions, are being used. I understand the answer to my questions will depend heavily on these issues as well as on the applications themselves. I just need to come up with a realistic number of instances/apps which are being run on a single machine by real users. I am seeking an answer to the following two questions: Number of Tomcat instances I am running on one machine: Number of individual applications I am running in all instances of Tomcat on one machine: Please feel free to respond to the mail list, or to me directly at [EMAIL PROTECTED] (if we don't want to clog the list with answers to this question). I will post a final resolution message to the mail list when I have come to some sort of conclusion. Thanks in advance for your help! -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED] -- To unsubscribe
