RE: Can someone PLEASE tell me why tomcat uses so much CPU???
Greetings... Have you also noticed a spike in CPU usage on your Apache server running mod_jk, or your network throughput? The reason I ask is we've got a similar problem here. We've got a slightly different setup (Apache 1.3.x, mod_jk, Tomcat 4.0.3, Sun JDK 1.3.1 - all on Solaris), but the same symptoms. Basically what we're seeing is sometimes mod_jk and the AJP13 connecter get stuck in an infinite loop spewing data at each other as fast as possible (and always the same data: Tomcat asking for a BODY_CHUNK of 8186 bytes, and mod_jk replying with an empty packet). The problem will only affect one connection at a time from the pool, but will slowly step up one connection at a time. Restarting either Tomcat or Apache solves the problem, but I've not been able to find any info on this either. I've been trying for a few days to replicate the problem on demand, but no luck yet Any of this sound familiar? Chris -Original Message- From: Brandon Cruz [mailto:[EMAIL PROTECTED]] Sent: 30 September 2002 21:57 To: Tomcat Users List Subject: Can someone PLEASE tell me why tomcat uses so much CPU??? Hi, I am using tomcat 3.2.4, mod_jk, apache 1.3.x, linux redhat 7.1. The java processes slowly take more and more CPU power. After about a day, java is taking 15% CPU, after two days, about 30% of a 1GHZ CPU, etc. If I leave it running for more than three or four days, everything is VERY slow. Does anyone know why this happens and if it is normal? I have not been able to find an answer to this anywhere! Brandon -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED] _ This message has been checked for all known viruses by the MessageLabs Virus Control Centre. This message has been checked for all known viruses by the MessageLabs Virus Control Centre. * Notice: This email is confidential and may contain copyright material of Ocado Limited (the Company). Opinions and views expressed in this message may not necessarily reflect the opinions and views of the Company. If you are not the intended recipient, please notify us immediately and delete all copies of this message. Please note that it is your responsibility to scan this message for viruses. Company reg. no. 3875000. Swallowdale Lane, Hemel Hempstead HP2 7PY * -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
RE: Can someone PLEASE tell me why tomcat uses so much CPU???
I'm not sure it is Tomcat. I have Tomcat 3.1 with Apache 1.3.26 and mod_jserv, many separate instances of Tomcat. My servers rarely go over 40% CPU, and my sites are not only high-traffic but resource intensive (on-the-fly custom graphics manipulation). Uptime is 112 days. I guess it could be a bug the showed up between Tomcat 3.1 and 3.2.4, but more likely it is a combination of RH 7.1 (mine are 7.2), the connector (which source of the connector are you using) and Tomcat. The issue could just as easily be in RH or the connector. John -Original Message- From: Brandon Cruz [mailto:[EMAIL PROTECTED]] Sent: Monday, September 30, 2002 4:57 PM To: Tomcat Users List Subject: Can someone PLEASE tell me why tomcat uses so much CPU??? Hi, I am using tomcat 3.2.4, mod_jk, apache 1.3.x, linux redhat 7.1. The java processes slowly take more and more CPU power. After about a day, java is taking 15% CPU, after two days, about 30% of a 1GHZ CPU, etc. If I leave it running for more than three or four days, everything is VERY slow. Does anyone know why this happens and if it is normal? I have not been able to find an answer to this anywhere! Brandon -- 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: Can someone PLEASE tell me why tomcat uses so much CPU???
I have to agree. I have a website that we pounded with 3 test computers and couldn't get Tomcat over 20% usage. -Original Message- From: Turner, John [mailto:[EMAIL PROTECTED]] Sent: Tuesday, October 01, 2002 9:19 AM To: 'Tomcat Users List' Subject: RE: Can someone PLEASE tell me why tomcat uses so much CPU??? I'm not sure it is Tomcat. I have Tomcat 3.1 with Apache 1.3.26 and mod_jserv, many separate instances of Tomcat. My servers rarely go over 40% CPU, and my sites are not only high-traffic but resource intensive (on-the-fly custom graphics manipulation). Uptime is 112 days. I guess it could be a bug the showed up between Tomcat 3.1 and 3.2.4, but more likely it is a combination of RH 7.1 (mine are 7.2), the connector (which source of the connector are you using) and Tomcat. The issue could just as easily be in RH or the connector. John -Original Message- From: Brandon Cruz [mailto:[EMAIL PROTECTED]] Sent: Monday, September 30, 2002 4:57 PM To: Tomcat Users List Subject: Can someone PLEASE tell me why tomcat uses so much CPU??? Hi, I am using tomcat 3.2.4, mod_jk, apache 1.3.x, linux redhat 7.1. The java processes slowly take more and more CPU power. After about a day, java is taking 15% CPU, after two days, about 30% of a 1GHZ CPU, etc. If I leave it running for more than three or four days, everything is VERY slow. Does anyone know why this happens and if it is normal? I have not been able to find an answer to this anywhere! Brandon -- 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] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
Re: Can someone PLEASE tell me why tomcat uses so much CPU???
This sounds like the bug I fixed in Tomcat 4.1.x where infrequently I saw a POST request put Tomcat into an infinite loop. We run Apache and Tomcat on different servers. I had noticed the increased CPU usage on the Tomcat server but hadn't noticed the increased CPU usage on the Apache server. I went back and reviewed our system load history and verified that when this bug is triggered both Apache and Tomcat cause increased CPU usage. This bug was fixed in the Tomcat 4.1.x branch and I ported it back to the Tomcat 4.0.x branch. This bug fix should be in the Tomcat 4.0.5 release. Regards, Glenn Chris Read wrote: Greetings... Have you also noticed a spike in CPU usage on your Apache server running mod_jk, or your network throughput? The reason I ask is we've got a similar problem here. We've got a slightly different setup (Apache 1.3.x, mod_jk, Tomcat 4.0.3, Sun JDK 1.3.1 - all on Solaris), but the same symptoms. Basically what we're seeing is sometimes mod_jk and the AJP13 connecter get stuck in an infinite loop spewing data at each other as fast as possible (and always the same data: Tomcat asking for a BODY_CHUNK of 8186 bytes, and mod_jk replying with an empty packet). The problem will only affect one connection at a time from the pool, but will slowly step up one connection at a time. Restarting either Tomcat or Apache solves the problem, but I've not been able to find any info on this either. I've been trying for a few days to replicate the problem on demand, but no luck yet Any of this sound familiar? Chris -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
RE: Can someone PLEASE tell me why tomcat uses so much CPU???
Upgrade at least to Tomcat 4.0.4 where this problem is particularly solved. I said particularly since the problem will still occur but it'll be handled more gracefully without to sky rocket the CPU usage. I'm not so sure will an upgrade to the latest mod_jk cure the problem completely. I just moved to Jakarta Tomcat connectors jk-1.2.0 (released last week) and so fare I didn't have time to observe the new system behavior. Regards, Rossen Raykov -Original Message- From: Chris Read [mailto:[EMAIL PROTECTED]] Sent: Tuesday, October 01, 2002 5:09 AM To: 'Tomcat Users List' Subject: RE: Can someone PLEASE tell me why tomcat uses so much CPU??? Greetings... Have you also noticed a spike in CPU usage on your Apache server running mod_jk, or your network throughput? The reason I ask is we've got a similar problem here. We've got a slightly different setup (Apache 1.3.x, mod_jk, Tomcat 4.0.3, Sun JDK 1.3.1 - all on Solaris), but the same symptoms. Basically what we're seeing is sometimes mod_jk and the AJP13 connecter get stuck in an infinite loop spewing data at each other as fast as possible (and always the same data: Tomcat asking for a BODY_CHUNK of 8186 bytes, and mod_jk replying with an empty packet). The problem will only affect one connection at a time from the pool, but will slowly step up one connection at a time. Restarting either Tomcat or Apache solves the problem, but I've not been able to find any info on this either. I've been trying for a few days to replicate the problem on demand, but no luck yet Any of this sound familiar? Chris -Original Message- From: Brandon Cruz [mailto:[EMAIL PROTECTED]] Sent: 30 September 2002 21:57 To: Tomcat Users List Subject: Can someone PLEASE tell me why tomcat uses so much CPU??? Hi, I am using tomcat 3.2.4, mod_jk, apache 1.3.x, linux redhat 7.1. The java processes slowly take more and more CPU power. After about a day, java is taking 15% CPU, after two days, about 30% of a 1GHZ CPU, etc. If I leave it running for more than three or four days, everything is VERY slow. Does anyone know why this happens and if it is normal? I have not been able to find an answer to this anywhere! Brandon -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED] _ This message has been checked for all known viruses by the MessageLabs Virus Control Centre. This message has been checked for all known viruses by the MessageLabs Virus Control Centre. * Notice: This email is confidential and may contain copyright material of Ocado Limited (the Company). Opinions and views expressed in this message may not necessarily reflect the opinions and views of the Company. If you are not the intended recipient, please notify us immediately and delete all copies of this message. Please note that it is your responsibility to scan this message for viruses. Company reg. no. 3875000. Swallowdale Lane, Hemel Hempstead HP2 7PY * -- 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: Can someone PLEASE tell me why tomcat uses so much CPU???
Glenn Neilson mentioned to me yesterday that I might want to use the -verbose:gc command when starting tomcat so that I can see how garbage collection is working. I have done this but it does not seem to give me much useful info. Is there anything in particular that I should be looking for? Is there a good way to pinpoint the problem to the connector either by looking at logs, setting a switch when I startup tomat, or anything else? I can't seem to find anything so far, who knows. Brandon -Original Message- From: Turner, John [mailto:[EMAIL PROTECTED]] Sent: Tuesday, October 01, 2002 7:19 AM To: 'Tomcat Users List' Subject: RE: Can someone PLEASE tell me why tomcat uses so much CPU??? I'm not sure it is Tomcat. I have Tomcat 3.1 with Apache 1.3.26 and mod_jserv, many separate instances of Tomcat. My servers rarely go over 40% CPU, and my sites are not only high-traffic but resource intensive (on-the-fly custom graphics manipulation). Uptime is 112 days. I guess it could be a bug the showed up between Tomcat 3.1 and 3.2.4, but more likely it is a combination of RH 7.1 (mine are 7.2), the connector (which source of the connector are you using) and Tomcat. The issue could just as easily be in RH or the connector. John -Original Message- From: Brandon Cruz [mailto:[EMAIL PROTECTED]] Sent: Monday, September 30, 2002 4:57 PM To: Tomcat Users List Subject: Can someone PLEASE tell me why tomcat uses so much CPU??? Hi, I am using tomcat 3.2.4, mod_jk, apache 1.3.x, linux redhat 7.1. The java processes slowly take more and more CPU power. After about a day, java is taking 15% CPU, after two days, about 30% of a 1GHZ CPU, etc. If I leave it running for more than three or four days, everything is VERY slow. Does anyone know why this happens and if it is normal? I have not been able to find an answer to this anywhere! Brandon -- 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] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
Can someone PLEASE tell me why tomcat uses so much CPU???
Hi, I am using tomcat 3.2.4, mod_jk, apache 1.3.x, linux redhat 7.1. The java processes slowly take more and more CPU power. After about a day, java is taking 15% CPU, after two days, about 30% of a 1GHZ CPU, etc. If I leave it running for more than three or four days, everything is VERY slow. Does anyone know why this happens and if it is normal? I have not been able to find an answer to this anywhere! Brandon -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
RE: Can someone PLEASE tell me why tomcat uses so much CPU???
What jdk are you using? I use suse 8, tomcat 3.3.x, apache 1.3.x, mod_jk, etc with IBM's 1.3 jdk and don't experience anything like that. --mikej -=- mike jackson [EMAIL PROTECTED] -Original Message- From: Brandon Cruz [mailto:[EMAIL PROTECTED]] Sent: Monday, September 30, 2002 1:57 PM To: Tomcat Users List Subject: Can someone PLEASE tell me why tomcat uses so much CPU??? Hi, I am using tomcat 3.2.4, mod_jk, apache 1.3.x, linux redhat 7.1. The java processes slowly take more and more CPU power. After about a day, java is taking 15% CPU, after two days, about 30% of a 1GHZ CPU, etc. If I leave it running for more than three or four days, everything is VERY slow. Does anyone know why this happens and if it is normal? I have not been able to find an answer to this anywhere! Brandon -- 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: Can someone PLEASE tell me why tomcat uses so much CPU???
Mike, Thanks for answering. I'm using Sun's JDK 1.3.1_01. We have been running this in production for over year and I think we have always had the problem. Since 3.2.4 requires restart whenever a web application is changed, it used to just get restarted often enough so that nobody ever noticed. There are enough people using the application now that it is becoming more and more noticable. I'm afraid that we are getting close to a point where it will be necessary to restart tomcat every day. It also slowly increases the amount of RAM it uses, but that's a whole different story and I just want to find out one answer at a time. Has anyone else experienced this and found a resolution to the problem? I have seen many posts but no answers... -Original Message- From: Mike Jackson [mailto:[EMAIL PROTECTED]] Sent: Monday, September 30, 2002 3:45 PM To: Tomcat Users List; [EMAIL PROTECTED] Subject: RE: Can someone PLEASE tell me why tomcat uses so much CPU??? What jdk are you using? I use suse 8, tomcat 3.3.x, apache 1.3.x, mod_jk, etc with IBM's 1.3 jdk and don't experience anything like that. --mikej -=- mike jackson [EMAIL PROTECTED] -Original Message- From: Brandon Cruz [mailto:[EMAIL PROTECTED]] Sent: Monday, September 30, 2002 1:57 PM To: Tomcat Users List Subject: Can someone PLEASE tell me why tomcat uses so much CPU??? Hi, I am using tomcat 3.2.4, mod_jk, apache 1.3.x, linux redhat 7.1. The java processes slowly take more and more CPU power. After about a day, java is taking 15% CPU, after two days, about 30% of a 1GHZ CPU, etc. If I leave it running for more than three or four days, everything is VERY slow. Does anyone know why this happens and if it is normal? I have not been able to find an answer to this anywhere! Brandon -- 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] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
RE: Can someone PLEASE tell me why tomcat uses so much CPU???
Hmmm, well, first things first, the Sun JDK isn't so good from what I understand. From what I've read it seems like the IBM one was nearly the best, but there's some better ones out there. You might try one of two things: either switch to the IBM jdk (1.3.x) or try upgrading to the current Sun JDK 1.4.x. See if that helps things any. Once the new JDK's are installed it should be a simple matter of changing your JAVA_HOME or in my case changing a symbolic link. --mikej -=- mike jackson [EMAIL PROTECTED] -Original Message- From: Brandon Cruz [mailto:[EMAIL PROTECTED]] Sent: Monday, September 30, 2002 2:09 PM To: Tomcat Users List Subject: RE: Can someone PLEASE tell me why tomcat uses so much CPU??? Mike, Thanks for answering. I'm using Sun's JDK 1.3.1_01. We have been running this in production for over year and I think we have always had the problem. Since 3.2.4 requires restart whenever a web application is changed, it used to just get restarted often enough so that nobody ever noticed. There are enough people using the application now that it is becoming more and more noticable. I'm afraid that we are getting close to a point where it will be necessary to restart tomcat every day. It also slowly increases the amount of RAM it uses, but that's a whole different story and I just want to find out one answer at a time. Has anyone else experienced this and found a resolution to the problem? I have seen many posts but no answers... -Original Message- From: Mike Jackson [mailto:[EMAIL PROTECTED]] Sent: Monday, September 30, 2002 3:45 PM To: Tomcat Users List; [EMAIL PROTECTED] Subject: RE: Can someone PLEASE tell me why tomcat uses so much CPU??? What jdk are you using? I use suse 8, tomcat 3.3.x, apache 1.3.x, mod_jk, etc with IBM's 1.3 jdk and don't experience anything like that. --mikej -=- mike jackson [EMAIL PROTECTED] -Original Message- From: Brandon Cruz [mailto:[EMAIL PROTECTED]] Sent: Monday, September 30, 2002 1:57 PM To: Tomcat Users List Subject: Can someone PLEASE tell me why tomcat uses so much CPU??? Hi, I am using tomcat 3.2.4, mod_jk, apache 1.3.x, linux redhat 7.1. The java processes slowly take more and more CPU power. After about a day, java is taking 15% CPU, after two days, about 30% of a 1GHZ CPU, etc. If I leave it running for more than three or four days, everything is VERY slow. Does anyone know why this happens and if it is normal? I have not been able to find an answer to this anywhere! Brandon -- 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] -- 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: Can someone PLEASE tell me why tomcat uses so much CPU???
You may want to start Tomcat with the java -verbose:gc arg next time. Information about TC including how long it took will be sent to stdout. This behaviour could be related to your JVM memory configuration/stack usage and garbage collection. Brandon Cruz wrote: Mike, Thanks for answering. I'm using Sun's JDK 1.3.1_01. We have been running this in production for over year and I think we have always had the problem. Since 3.2.4 requires restart whenever a web application is changed, it used to just get restarted often enough so that nobody ever noticed. There are enough people using the application now that it is becoming more and more noticable. I'm afraid that we are getting close to a point where it will be necessary to restart tomcat every day. It also slowly increases the amount of RAM it uses, but that's a whole different story and I just want to find out one answer at a time. Has anyone else experienced this and found a resolution to the problem? I have seen many posts but no answers... -Original Message- From: Mike Jackson [mailto:[EMAIL PROTECTED]] Sent: Monday, September 30, 2002 3:45 PM To: Tomcat Users List; [EMAIL PROTECTED] Subject: RE: Can someone PLEASE tell me why tomcat uses so much CPU??? What jdk are you using? I use suse 8, tomcat 3.3.x, apache 1.3.x, mod_jk, etc with IBM's 1.3 jdk and don't experience anything like that. --mikej -=- mike jackson [EMAIL PROTECTED] -Original Message- From: Brandon Cruz [mailto:[EMAIL PROTECTED]] Sent: Monday, September 30, 2002 1:57 PM To: Tomcat Users List Subject: Can someone PLEASE tell me why tomcat uses so much CPU??? Hi, I am using tomcat 3.2.4, mod_jk, apache 1.3.x, linux redhat 7.1. The java processes slowly take more and more CPU power. After about a day, java is taking 15% CPU, after two days, about 30% of a 1GHZ CPU, etc. If I leave it running for more than three or four days, everything is VERY slow. Does anyone know why this happens and if it is normal? I have not been able to find an answer to this anywhere! Brandon -- 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] -- 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: Can someone PLEASE tell me why tomcat uses so much CPU???
Mike, Thanks again for your advice! I have never used other JDK's, will all the methods and the entire API be the same or should we do extensive testing before trying the new JDK with our applications? Either way, we'll download and try it immediately and see what happens. Brandon -Original Message- From: Mike Jackson [mailto:[EMAIL PROTECTED]] Sent: Monday, September 30, 2002 4:03 PM To: Tomcat Users List; [EMAIL PROTECTED] Subject: RE: Can someone PLEASE tell me why tomcat uses so much CPU??? Hmmm, well, first things first, the Sun JDK isn't so good from what I understand. From what I've read it seems like the IBM one was nearly the best, but there's some better ones out there. You might try one of two things: either switch to the IBM jdk (1.3.x) or try upgrading to the current Sun JDK 1.4.x. See if that helps things any. Once the new JDK's are installed it should be a simple matter of changing your JAVA_HOME or in my case changing a symbolic link. --mikej -=- mike jackson [EMAIL PROTECTED] -Original Message- From: Brandon Cruz [mailto:[EMAIL PROTECTED]] Sent: Monday, September 30, 2002 2:09 PM To: Tomcat Users List Subject: RE: Can someone PLEASE tell me why tomcat uses so much CPU??? Mike, Thanks for answering. I'm using Sun's JDK 1.3.1_01. We have been running this in production for over year and I think we have always had the problem. Since 3.2.4 requires restart whenever a web application is changed, it used to just get restarted often enough so that nobody ever noticed. There are enough people using the application now that it is becoming more and more noticable. I'm afraid that we are getting close to a point where it will be necessary to restart tomcat every day. It also slowly increases the amount of RAM it uses, but that's a whole different story and I just want to find out one answer at a time. Has anyone else experienced this and found a resolution to the problem? I have seen many posts but no answers... -Original Message- From: Mike Jackson [mailto:[EMAIL PROTECTED]] Sent: Monday, September 30, 2002 3:45 PM To: Tomcat Users List; [EMAIL PROTECTED] Subject: RE: Can someone PLEASE tell me why tomcat uses so much CPU??? What jdk are you using? I use suse 8, tomcat 3.3.x, apache 1.3.x, mod_jk, etc with IBM's 1.3 jdk and don't experience anything like that. --mikej -=- mike jackson [EMAIL PROTECTED] -Original Message- From: Brandon Cruz [mailto:[EMAIL PROTECTED]] Sent: Monday, September 30, 2002 1:57 PM To: Tomcat Users List Subject: Can someone PLEASE tell me why tomcat uses so much CPU??? Hi, I am using tomcat 3.2.4, mod_jk, apache 1.3.x, linux redhat 7.1. The java processes slowly take more and more CPU power. After about a day, java is taking 15% CPU, after two days, about 30% of a 1GHZ CPU, etc. If I leave it running for more than three or four days, everything is VERY slow. Does anyone know why this happens and if it is normal? I have not been able to find an answer to this anywhere! Brandon -- 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] -- 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: Can someone PLEASE tell me why tomcat uses so much CPU???
I'm no Linux guru. But did you try running Tomcat with the classic JVM? With -client, -server or -hotspot I think there are many process that are started. And if your code opens underlying sockets, etc, it takes more processes which I believe remain hanging. If you run Tomcat with -classic, only one JVM is started. Hope this helps. Note that JDK 1.4.x doesn't support the -classic. RS Brandon Cruz [EMAIL PROTECTED]To: Tomcat Users List [EMAIL PROTECTED] cc: 09/30/02 04:09 PMSubject: RE: Can someone PLEASE tell me why tomcat uses so Please respond to much CPU??? Tomcat Users List Mike, Thanks for answering. I'm using Sun's JDK 1.3.1_01. We have been running this in production for over year and I think we have always had the problem. Since 3.2.4 requires restart whenever a web application is changed, it used to just get restarted often enough so that nobody ever noticed. There are enough people using the application now that it is becoming more and more noticable. I'm afraid that we are getting close to a point where it will be necessary to restart tomcat every day. It also slowly increases the amount of RAM it uses, but that's a whole different story and I just want to find out one answer at a time. Has anyone else experienced this and found a resolution to the problem? I have seen many posts but no answers... -Original Message- From: Mike Jackson [mailto:[EMAIL PROTECTED]] Sent: Monday, September 30, 2002 3:45 PM To: Tomcat Users List; [EMAIL PROTECTED] Subject: RE: Can someone PLEASE tell me why tomcat uses so much CPU??? What jdk are you using? I use suse 8, tomcat 3.3.x, apache 1.3.x, mod_jk, etc with IBM's 1.3 jdk and don't experience anything like that. --mikej -=- mike jackson [EMAIL PROTECTED] -Original Message- From: Brandon Cruz [mailto:[EMAIL PROTECTED]] Sent: Monday, September 30, 2002 1:57 PM To: Tomcat Users List Subject: Can someone PLEASE tell me why tomcat uses so much CPU??? Hi, I am using tomcat 3.2.4, mod_jk, apache 1.3.x, linux redhat 7.1. The java processes slowly take more and more CPU power. After about a day, java is taking 15% CPU, after two days, about 30% of a 1GHZ CPU, etc. If I leave it running for more than three or four days, everything is VERY slow. Does anyone know why this happens and if it is normal? I have not been able to find an answer to this anywhere! Brandon -- 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] -- 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]
AW: Can someone PLEASE tell me why tomcat uses so much CPU???
Testing after a fundamental change is always a good idea. Although the API's are the same, neither of the JDK's is bug free. If you will hit the bug, depends on your application. We experienced the following: - IBM JDK is in most of our cases faster and more stable than the sun jdk. - In few cases the IBM jdk is less stable. We have one site on a dedicated server that crashed regularly with the IBM JDK but not wit sun's, although we have other sites on a different server with basicaly the same application on a different server that run without problems on the IBM JDK. -Ursprüngliche Nachricht- Von: Brandon Cruz [mailto:[EMAIL PROTECTED]] Gesendet: Montag, 30. September 2002 23:24 An: Tomcat Users List; [EMAIL PROTECTED] Betreff: RE: Can someone PLEASE tell me why tomcat uses so much CPU??? I have never used other JDK's, will all the methods and the entire API be the same or should we do extensive testing before trying the new JDK with our applications? -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
