Re: How stable is Tomcat?
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Yawar, On 8/21/2010 8:59 AM, Yawar Khan wrote: Guys, is tomcat stable enough to host large scale production applications getting 1500+ hits everyday? Certainly. 1500 hits/day is nothing. You could do that on a smartphone. Our daily average for August so far is 26869 hits (which isn't much /at all/) and Tomcat 5.5.x isn't batting an eyelash at that. We run with a measly 10 database connections in our pool, too. Mean response time (on the server, so there's no network time taken into account) for all requests over the last 6 months or so is 135ms (weighted average... unweighted average is 154ms). That's with an old version of Tomcat, run through Apache httpd/mod_jk, using the blocking I/O AJP connector, using a 3GHz quad-core CPU with a heap size of a mere 500MiB (I thought we were using 192MiB, but it looks like I forgot to constrain the heap size the last time I launched the JVM). The JVM has never crashed in the 7 years we've been running this webapp (it's actually 4 webapps, running in 4 separate JVMs), nor has Tomcat. The only unexpected downtime we've ever had was when we busted the heap once long ago (when we were running under a 64MiB heap) and that was because we had a poor capacity plan, not because of Java/Tomcat. and as much concurrent database connections. 1500 database connections might be a lot to configure. Remember that you'll likely get those 1500+ hits during a 24-hour period (or even an 8-hour period) and not all at once. You probably need far fewer database connections than you think you do. I know alot depends on the applications architecture but just how good is tomcat? Really effing good. - -chris -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.10 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAkx1LEgACgkQ9CaO5/Lv0PD6rACglH6ICeQl4hpKctAaC9UZiFUN djIAn2DzK0AvMsC+hedrInR8SfCpud6a =XWVz -END PGP SIGNATURE- - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: How stable is Tomcat?
On 8/25/2010 10:44 AM, Christopher Schultz wrote: ... I know alot depends on the applications architecture but just how good is tomcat? Really effing good. +1 - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: How stable is Tomcat?
On 08/25/10 16:51, David kerber wrote: On 8/25/2010 10:44 AM, Christopher Schultz wrote: I know alot depends on the applications architecture but just how good is tomcat? Really effing good. +1 Tomcat itself is usually the last thing to be worried about when it comes to performance and stability. Your webapp, your database, your network should come first. And if you are expecting really huge loads, Tomcat's clustering and load-balancing features can help you distribute that onto several servers. Cheers, Edmund - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: How stable is Tomcat?
On 21/08/2010 20:13, Ken Fox wrote: On Sat, Aug 21, 2010 at 2:42 PM, Pid * p...@pidster.com wrote: We don't usually count web traffic in hits any more, because a single page could easily cause 100 hits. I think hits to your app servers is still an appropriate way to think about your server load. If a page view generates 100 hits to your Tomcat instances, your CDN is probably busted. A CDN is somewhat of an assumption, in this case, I think. Marketing and ad revenue talk a lot about page views, but that's a useless stat for sizing your Tomcat servers. Don't give in to the dark side. ;) I disagree. Pages, forms, Servlets are far more likely to account for server load than static files. Regardless, an average of one *hit* per minute could easily mean a mere 1 *page* an hour. On a related topic, anybody have trouble scaling Comet-based sites with Tomcat? It seems like ad revenue could be at least as big a hurdle as server scaling. That would be off-topic for this thread. p - Ken - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org 0x62590808.asc Description: application/pgp-keys signature.asc Description: OpenPGP digital signature
How stable is Tomcat?
Guys, is tomcat stable enough to host large scale production applications getting 1500+ hits everyday? and as much concurrent database connections. I know alot depends on the applications architecture but just how good is tomcat?
Re: How stable is Tomcat?
I think that maybe you are mixing up stability and scalability. While they are connected, an unstable system can fail at low volume. Also, I don't think that 1500 hits a day is that much. Michel - Original Message - From: Yawar Khan khanya...@yahoo.com To: Tomcat Users users@tomcat.apache.org Sent: Saturday, August 21, 2010 8:59 AM Subject: How stable is Tomcat? Guys, is tomcat stable enough to host large scale production applications getting 1500+ hits everyday? and as much concurrent database connections. I know alot depends on the applications architecture but just how good is tomcat? - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: How stable is Tomcat?
I totally agree with Michel. We developed a JSF 2.0 application using Tomcat as the web container. Tomcat is as stable as the application you develop. The system we develop hosts a RIA application based on ICEFaces for almost 5000 users and after a lot of debugging and jvm fine tunning, we now have an almost rock solid product. Note that the debugging was done over the app, and the jvm fine tunning is a most for this kind of application. Tomcat works fine with just some modifications in the config files. Actually we use the latest tomcat 6 running over linux CentOS. Also we use Tomcat 6 for a landing page for a Telco Operator. The landing page was developed using JSP technology and implements Google SSO. This applications actually serves 2 users, with almost 15000 hits on a daily basis. Again, the main stabilization process was done in the application, not Tomcat, and Tomcat works just fine. Hope this information was helpful. Regards Ing. Marco Antonio Castillo Chief Design Engineer Van Der Kaaden IT Consulting Guatemala, Guatemala C.A. tel: +502 22382710 mobile: +502 59186971 e-mail: mabcasti...@vdkit.net sip: mabcasti...@sip.vdkit.net On Sat, Aug 21, 2010 at 7:07 AM, michel compu...@videotron.ca wrote: I think that maybe you are mixing up stability and scalability. While they are connected, an unstable system can fail at low volume. Also, I don't think that 1500 hits a day is that much. Michel - Original Message - From: Yawar Khan khanya...@yahoo.com To: Tomcat Users users@tomcat.apache.org Sent: Saturday, August 21, 2010 8:59 AM Subject: How stable is Tomcat? Guys, is tomcat stable enough to host large scale production applications getting 1500+ hits everyday? and as much concurrent database connections. I know alot depends on the applications architecture but just how good is tomcat? - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
RE: How stable is Tomcat?
From: Yawar Khan [mailto:khanya...@yahoo.com] Subject: How stable is Tomcat? is tomcat stable enough to host large scale production applications http://wiki.apache.org/tomcat/PoweredBy getting 1500+ hits everyday? As others have stated, 1500 hits a day is down in the noise level. and as much concurrent database connections Concurrent with what? One normally utilizes database connection pooling to avoid creating a connection on each request. But with such a low level of activity, it probably won't matter. - Chuck THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: How stable is Tomcat?
thank you marco for your insight and sharing your experience. From: Marco Castillo mabcasti...@vdkit.net To: Tomcat Users List users@tomcat.apache.org Sent: Sat, August 21, 2010 7:09:09 PM Subject: Re: How stable is Tomcat? I totally agree with Michel. We developed a JSF 2.0 application using Tomcat as the web container. Tomcat is as stable as the application you develop. The system we develop hosts a RIA application based on ICEFaces for almost 5000 users and after a lot of debugging and jvm fine tunning, we now have an almost rock solid product. Note that the debugging was done over the app, and the jvm fine tunning is a most for this kind of application. Tomcat works fine with just some modifications in the config files. Actually we use the latest tomcat 6 running over linux CentOS. Also we use Tomcat 6 for a landing page for a Telco Operator. The landing page was developed using JSP technology and implements Google SSO. This applications actually serves 2 users, with almost 15000 hits on a daily basis. Again, the main stabilization process was done in the application, not Tomcat, and Tomcat works just fine. Hope this information was helpful. Regards Ing. Marco Antonio Castillo Chief Design Engineer Van Der Kaaden IT Consulting Guatemala, Guatemala C.A. tel: +502 22382710 mobile: +502 59186971 e-mail: mabcasti...@vdkit.net sip: mabcasti...@sip.vdkit.net On Sat, Aug 21, 2010 at 7:07 AM, michel compu...@videotron.ca wrote: I think that maybe you are mixing up stability and scalability. While they are connected, an unstable system can fail at low volume. Also, I don't think that 1500 hits a day is that much. Michel - Original Message - From: Yawar Khan khanya...@yahoo.com To: Tomcat Users users@tomcat.apache.org Sent: Saturday, August 21, 2010 8:59 AM Subject: How stable is Tomcat? Guys, is tomcat stable enough to host large scale production applications getting 1500+ hits everyday? and as much concurrent database connections. I know alot depends on the applications architecture but just how good is tomcat? - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: How stable is Tomcat?
Yawar Khan wrote: Guys, is tomcat stable enough to host large scale production applications getting 1500+ hits everyday? and as much concurrent database connections. I know alot depends on the applications architecture but just how good is tomcat? My app has approx 550 - 600 simultaneous users, and processes ~4 - 5 million transactions per day from them, split across two tomcat instances running on the same server. It's been months since I've had to restart a tomcat service, let alone reboot the server. D - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: How stable is Tomcat?
My company has run Tomcat apps on Amazon's EC2 that have exceeded 1,500 hits per *second*. We use Amazon's load balancer in front of a variable number of Tomcat instances (each on their own EC2 instance). For 1,500 hits per day you probably only need one small EC2 instance running a single Tomcat. We had some database scaling problems due to a misunderstanding of how Amazon throttling works--at about 3,000 hits per second the traffic we were sending to SimpleDB caused Amazon to fail every request. Tomcat continued to run very well at that load. We do not have a web tier in front of Tomcat, but we do use Akamai for caching (as a vanilla CDN). Given your low traffic numbers, you probably don't need a web tier or a CDN in front of Tomcat. You can get by even without a load balancer, but I'd recommend using one to give yourself more options for rolling code and adding capacity. - Ken On Sat, Aug 21, 2010 at 8:59 AM, Yawar Khan khanya...@yahoo.com wrote: Guys, is tomcat stable enough to host large scale production applications getting 1500+ hits everyday? and as much concurrent database connections. I know alot depends on the applications architecture but just how good is tomcat?
Re: How stable is Tomcat?
On 21 Aug 2010, at 18:09, Ken Fox k...@vulpes.com wrote: My company has run Tomcat apps on Amazon's EC2 that have exceeded 1,500 hits per *second*. We use Amazon's load balancer in front of a variable number of Tomcat instances (each on their own EC2 instance). For 1,500 hits per day you probably only need one small EC2 instance running a single Tomcat. We don't usually count web traffic in hits any more, because a single page could easily cause 100 hits. You could probably use pigeons to send data as quickly. 1500 hits per day is ~1 hit per minute. p We had some database scaling problems due to a misunderstanding of how Amazon throttling works--at about 3,000 hits per second the traffic we were sending to SimpleDB caused Amazon to fail every request. Tomcat continued to run very well at that load. We do not have a web tier in front of Tomcat, but we do use Akamai for caching (as a vanilla CDN). Given your low traffic numbers, you probably don't need a web tier or a CDN in front of Tomcat. You can get by even without a load balancer, but I'd recommend using one to give yourself more options for rolling code and adding capacity. - Ken On Sat, Aug 21, 2010 at 8:59 AM, Yawar Khan khanya...@yahoo.com wrote: Guys, is tomcat stable enough to host large scale production applications getting 1500+ hits everyday? and as much concurrent database connections. I know alot depends on the applications architecture but just how good is tomcat? - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: How stable is Tomcat?
On Sat, Aug 21, 2010 at 2:42 PM, Pid * p...@pidster.com wrote: We don't usually count web traffic in hits any more, because a single page could easily cause 100 hits. I think hits to your app servers is still an appropriate way to think about your server load. If a page view generates 100 hits to your Tomcat instances, your CDN is probably busted. Marketing and ad revenue talk a lot about page views, but that's a useless stat for sizing your Tomcat servers. Don't give in to the dark side. ;) On a related topic, anybody have trouble scaling Comet-based sites with Tomcat? It seems like ad revenue could be at least as big a hurdle as server scaling. - Ken - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
How stable is tomcat
Wednesday, November 1, 2006, 8:19:07 PM, you wrote: CS John, CS John Gorkos wrote: On Wednesday 01 November 2006 11:58, Christopher Schultz wrote: John Gorkos wrote: I use per-context JNDI handles to the same Postgres database for multiple apps running inside tomcat. Each context.xml sets up connection limits, max idle, etc, slightly differently. You said per-context JNDI handles, not per-context JNDI DataSources. Where are you defining your datasource? In context.xml, or in server.xml with additional, per-context configuration in context.xml? Can you show us the configuration for your JNDI DataSource, including How stable is tomcat with Sun's HotSpot JVM 1.5? Right now we have apache servers that are up for 3 and 4 months. So I guess apache 1.3 may works for months. How stable is tomcat against apache or other webservers? Would tomcat be able to work 1 year without restart? I ask that because tomcat with eclipse became unstable twice today. (May be it was happening because of debugging mode of JVM) -- Best regards, Dimamailto:[EMAIL PROTECTED] - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: How stable is tomcat
Dima Retov wrote: How stable is tomcat with Sun's HotSpot JVM 1.5? Right now we have apache servers that are up for 3 and 4 months. So I guess apache 1.3 may works for months. How stable is tomcat against apache or other webservers? Would tomcat be able to work 1 year without restart? I've had three instances of 5.5.12 running on the same machine for 6 months without a restart, and that restart 6 months ago was due to a power failure. One of those instances gets around 2 million transactions per day. I ask that because tomcat with eclipse became unstable twice today. (May be it was happening because of debugging mode of JVM) It's probably not due to tomcat; you have a lot more going on than just a tomcat server in that situation. Dave - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: How stable is tomcat
I also know a couple of instances which ran under high load for a couple of months. Usually though the frequency for changes in the apps are higher than that. Be careful: I would avoid hot deployment in critical production. Also: It's not totally unusual for apps to have memory leaks. So minotor your memory usage in the first weeks to check, if it gets stable. Regards, Rainer David Kerber schrieb: Dima Retov wrote: How stable is tomcat with Sun's HotSpot JVM 1.5? Right now we have apache servers that are up for 3 and 4 months. So I guess apache 1.3 may works for months. How stable is tomcat against apache or other webservers? Would tomcat be able to work 1 year without restart? I've had three instances of 5.5.12 running on the same machine for 6 months without a restart, and that restart 6 months ago was due to a power failure. One of those instances gets around 2 million transactions per day. I ask that because tomcat with eclipse became unstable twice today. (May be it was happening because of debugging mode of JVM) It's probably not due to tomcat; you have a lot more going on than just a tomcat server in that situation. Dave - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re[2]: How stable is tomcat
Thanks Dave. What version of JVM have you used? Wednesday, November 1, 2006, 8:57:19 PM, you wrote: DK Dima Retov wrote: How stable is tomcat with Sun's HotSpot JVM 1.5? Right now we have apache servers that are up for 3 and 4 months. So I guess apache 1.3 may works for months. How stable is tomcat against apache or other webservers? Would tomcat be able to work 1 year without restart? DK I've had three instances of 5.5.12 running on the same machine for 6 DK months without a restart, and that restart 6 months ago was due to a DK power failure. One of those instances gets around 2 million DK transactions per day. I ask that because tomcat with eclipse became unstable twice today. (May be it was happening because of debugging mode of JVM) DK It's probably not due to tomcat; you have a lot more going on than just DK a tomcat server in that situation. DK Dave DK - DK To start a new topic, e-mail: users@tomcat.apache.org DK To unsubscribe, e-mail: [EMAIL PROTECTED] DK For additional commands, e-mail: [EMAIL PROTECTED] -- Best regards, Dimamailto:[EMAIL PROTECTED] - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: How stable is tomcat
Concerning my experience: no stability issues with either 1.4.2 or 1.5, as long as you stick to a reasonably new patch level (not the one, which might be only a week old, but the newest one older than a month should be perfect). Dima Retov schrieb: Thanks Dave. What version of JVM have you used? Wednesday, November 1, 2006, 8:57:19 PM, you wrote: DK Dima Retov wrote: How stable is tomcat with Sun's HotSpot JVM 1.5? Right now we have apache servers that are up for 3 and 4 months. So I guess apache 1.3 may works for months. How stable is tomcat against apache or other webservers? Would tomcat be able to work 1 year without restart? DK I've had three instances of 5.5.12 running on the same machine for 6 DK months without a restart, and that restart 6 months ago was due to a DK power failure. One of those instances gets around 2 million DK transactions per day. I ask that because tomcat with eclipse became unstable twice today. (May be it was happening because of debugging mode of JVM) DK It's probably not due to tomcat; you have a lot more going on than just DK a tomcat server in that situation. DK Dave DK - DK To start a new topic, e-mail: users@tomcat.apache.org DK To unsubscribe, e-mail: [EMAIL PROTECTED] DK For additional commands, e-mail: [EMAIL PROTECTED] - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: How stable is tomcat
We had thousands of problems with Sun JDK that is why we switched to IBM JDK who manage GC in a great manner. You see the progress of the memory going down but it recover every single bit. Sun jdk always recover but there is some remaining memory that he do not release. -Original Message- From: Rainer Jung [mailto:[EMAIL PROTECTED] Sent: Wednesday, November 01, 2006 2:06 PM To: Tomcat Users List Subject: Re: How stable is tomcat I also know a couple of instances which ran under high load for a couple of months. Usually though the frequency for changes in the apps are higher than that. Be careful: I would avoid hot deployment in critical production. Also: It's not totally unusual for apps to have memory leaks. So minotor your memory usage in the first weeks to check, if it gets stable. Regards, Rainer David Kerber schrieb: Dima Retov wrote: How stable is tomcat with Sun's HotSpot JVM 1.5? Right now we have apache servers that are up for 3 and 4 months. So I guess apache 1.3 may works for months. How stable is tomcat against apache or other webservers? Would tomcat be able to work 1 year without restart? I've had three instances of 5.5.12 running on the same machine for 6 months without a restart, and that restart 6 months ago was due to a power failure. One of those instances gets around 2 million transactions per day. I ask that because tomcat with eclipse became unstable twice today. (May be it was happening because of debugging mode of JVM) It's probably not due to tomcat; you have a lot more going on than just a tomcat server in that situation. Dave - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] This message (including any attachments) contains confidential and/or proprietary information intended only for the addressee. Any unauthorized disclosure, copying, distribution or reliance on the contents of this information is strictly prohibited and may constitute a violation of law. If you are not the intended recipient, please notify the sender immediately by responding to this e-mail, and delete the message from your system. If you have any questions about this e-mail please notify the sender immediately. - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: How stable is tomcat
Dima Retov wrote: Thanks Dave. What version of JVM have you used? I believe (not sure) it's 1.5.0_06 on the server; I'm running _07 on my dev machine. As Rainer mentioned, don't try to use hot deployment for busy apps; I always stop tomcat for updates, so my updates tend to be saved up and posted every few months. As Rainer also mentioned, check your memory usage for the first few weeks to be sure you don't have any leaks. I had a couple when that busy app first went into beta testing a couple of years ago, and it wouldn't go more than a week or so without running into out of memory errors.. Dave - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: How stable is tomcat
Dima, Please don't steal threads. Start a new one next time. How stable is tomcat with Sun's HotSpot JVM 1.5? How stable is tomcat against apache or other webservers? They are not directly comparable (Apache httpd and Tomcat) as Tomcat does things Apache httpd cannot do, and vice versa. Would tomcat be able to work 1 year without restart? My current longest running Tomcat instance was started on May 13th of this year (running Tomcat 4.1.30 and Java 1.4.2_04 on Linux). The only reason it hasn't run longer than that is because we perform semi-regular releases of new features. With a well-written application, Tomcat can run forever. -chris signature.asc Description: OpenPGP digital signature
