RE: Tomcat JVM GC
You can't disable garbage collection or java won't run. Please rephrase your question. -Original Message- From: Shakeel Ahmad [mailto:[EMAIL PROTECTED] Sent: 25 August 2004 12:08 To: Tomcat Users List Subject: Tomcat JVM GC Hi, can I disable GC thread in Tomcat. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] Any opinions expressed in this E-mail may be those of the individual and not necessarily the company. This E-mail and any files transmitted with it are confidential and solely for the use of the intended recipient. If you are not the intended recipient or the person responsible for delivering to the intended recipient, be advised that you have received this E-mail in error and that any use or copying is strictly prohibited. If you have received this E-mail in error please notify the beCogent postmaster at [EMAIL PROTECTED] Unless expressly stated, opinions in this email are those of the individual sender and not beCogent Ltd. You must take full responsibility for virus checking this email and any attachments. Please note that the content of this email or any of its attachments may contain data that falls within the scope of the Data Protection Acts and that you must ensure that any handling or processing of such data by you is fully compliant with the terms and provisions of the Data Protection Act 1984 and 1998. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Tomcat JVM GC
Its known that JVM schedular runs gc thread depending upon some concrete values, now I want to set such parameters, or my heap sizes so that the JVM schedular, ignores gc thread. We have 1.3G Ram on our server and our heap never goes beyond 400-450M, now the gc thread is a hurdle in our system , we want that it made the gc thread ignored, keep in mind we are running at 1024-1024M on JVM heap. -Original Message- From: Dale, Matt [mailto:[EMAIL PROTECTED] Sent: Wednesday, August 25, 2004 4:15 PM To: Tomcat Users List Subject: RE: Tomcat JVM GC You can't disable garbage collection or java won't run. Please rephrase your question. -Original Message- From: Shakeel Ahmad [mailto:[EMAIL PROTECTED] Sent: 25 August 2004 12:08 To: Tomcat Users List Subject: Tomcat JVM GC Hi, can I disable GC thread in Tomcat. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Tomcat JVM GC
The garbage collection is variable depending on your JVM parameters. Here are a couple of links to help you understand a bit more about how the Garbage Collections work. http://java.sun.com/developer/technicalArticles/Programming/turbo/ http://java.sun.com/docs/hotspot/gc1.4.2/ I would also recommend downloading jvmstat from sun as visualgc gives you a graphical visualation of the heap and garbage collections, allowing you to see exactly where the bottle necks are. You first step should probably be have a play with the different collectors or Agressive Heap. Ta Matt -Original Message- From: Shakeel Ahmad [mailto:[EMAIL PROTECTED] Sent: 25 August 2004 12:44 To: Tomcat Users List Subject: RE: Tomcat JVM GC Its known that JVM schedular runs gc thread depending upon some concrete values, now I want to set such parameters, or my heap sizes so that the JVM schedular, ignores gc thread. We have 1.3G Ram on our server and our heap never goes beyond 400-450M, now the gc thread is a hurdle in our system , we want that it made the gc thread ignored, keep in mind we are running at 1024-1024M on JVM heap. -Original Message- From: Dale, Matt [mailto:[EMAIL PROTECTED] Sent: Wednesday, August 25, 2004 4:15 PM To: Tomcat Users List Subject: RE: Tomcat JVM GC You can't disable garbage collection or java won't run. Please rephrase your question. -Original Message- From: Shakeel Ahmad [mailto:[EMAIL PROTECTED] Sent: 25 August 2004 12:08 To: Tomcat Users List Subject: Tomcat JVM GC Hi, can I disable GC thread in Tomcat. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] Any opinions expressed in this E-mail may be those of the individual and not necessarily the company. This E-mail and any files transmitted with it are confidential and solely for the use of the intended recipient. If you are not the intended recipient or the person responsible for delivering to the intended recipient, be advised that you have received this E-mail in error and that any use or copying is strictly prohibited. If you have received this E-mail in error please notify the beCogent postmaster at [EMAIL PROTECTED] Unless expressly stated, opinions in this email are those of the individual sender and not beCogent Ltd. You must take full responsibility for virus checking this email and any attachments. Please note that the content of this email or any of its attachments may contain data that falls within the scope of the Data Protection Acts and that you must ensure that any handling or processing of such data by you is fully compliant with the terms and provisions of the Data Protection Act 1984 and 1998. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Tomcat JVM GC
Its known that JVM schedular runs gc thread depending upon some concrete values, now I want to set such parameters, or my heap sizes so that the JVM schedular, ignores gc thread. We have 1.3G Ram on our server and our heap You are mistaken, you do not want it to ignore the gc thread, as you would then very fast run out of heap space, you just want to tune the garbage collector a little. To do this, read this page until you understand it: http://java.sun.com/docs/hotspot/gc1.4.2/ Then you can use the GC Portal tool to help you define the optimal GC configuration for your application: http://java.sun.com/developer/technicalArticles/Programming/GCPortal/ Of course, it could turn out that in order to improve your performance you might have to rewrite parts of your application to be less wasteful with objects. Regards, -- Mats Henrikson Unix Systems Programmer Systems Development Support Oxford University Computing Services - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Tomcat JVM GC
Actually we have our own gc mechanism which has a proven record of doing things for our application, it never lets our application go out of memory, but it works at high level, now with this robust design we have only issues from JVM's original gc work. Our calculations have proven that if JVM's gc does not work automatically then our real time nodes can work more effectively. -Original Message- From: Mats Henrikson [mailto:[EMAIL PROTECTED] Sent: Wednesday, August 25, 2004 4:46 PM To: Tomcat Users List Subject: RE: Tomcat JVM GC Its known that JVM schedular runs gc thread depending upon some concrete values, now I want to set such parameters, or my heap sizes so that the JVM schedular, ignores gc thread. We have 1.3G Ram on our server and our heap You are mistaken, you do not want it to ignore the gc thread, as you would then very fast run out of heap space, you just want to tune the garbage collector a little. To do this, read this page until you understand it: http://java.sun.com/docs/hotspot/gc1.4.2/ Then you can use the GC Portal tool to help you define the optimal GC configuration for your application: http://java.sun.com/developer/technicalArticles/Programming/GCPortal/ Of course, it could turn out that in order to improve your performance you might have to rewrite parts of your application to be less wasteful with objects. Regards, -- Mats Henrikson Unix Systems Programmer Systems Development Support Oxford University Computing Services - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Tomcat JVM GC
You should still look at the articles that I posted my reply. If you really want to use your own garbage collection then you will have to first fix the size of the certain areas within the heap. There is no way to turn off the jvm's own garbage collection, when it cannot allocate space for an object it will do a garbage collection. If there is still not enough space then it will expand the pool so that there is space, up until the maximum allowed for that pool. If you fix the size of the pools and always do a gc before the pool runs out of memory then you will be fine. If you've fixed the pools and you run out of memory then your own gc algorithm must be deficient and the JVM will do a gc anyway. I suspect that with the vast array of GC parameters available you should be able to find some that will work as well as or better than your own but thats just my opinion. -Original Message- From: Shakeel Ahmad [mailto:[EMAIL PROTECTED] Sent: 25 August 2004 14:17 To: Tomcat Users List Subject: RE: Tomcat JVM GC Actually we have our own gc mechanism which has a proven record of doing things for our application, it never lets our application go out of memory, but it works at high level, now with this robust design we have only issues from JVM's original gc work. Our calculations have proven that if JVM's gc does not work automatically then our real time nodes can work more effectively. -Original Message- From: Mats Henrikson [mailto:[EMAIL PROTECTED] Sent: Wednesday, August 25, 2004 4:46 PM To: Tomcat Users List Subject: RE: Tomcat JVM GC Its known that JVM schedular runs gc thread depending upon some concrete values, now I want to set such parameters, or my heap sizes so that the JVM schedular, ignores gc thread. We have 1.3G Ram on our server and our heap You are mistaken, you do not want it to ignore the gc thread, as you would then very fast run out of heap space, you just want to tune the garbage collector a little. To do this, read this page until you understand it: http://java.sun.com/docs/hotspot/gc1.4.2/ Then you can use the GC Portal tool to help you define the optimal GC configuration for your application: http://java.sun.com/developer/technicalArticles/Programming/GCPortal/ Of course, it could turn out that in order to improve your performance you might have to rewrite parts of your application to be less wasteful with objects. Regards, -- Mats Henrikson Unix Systems Programmer Systems Development Support Oxford University Computing Services - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] Any opinions expressed in this E-mail may be those of the individual and not necessarily the company. This E-mail and any files transmitted with it are confidential and solely for the use of the intended recipient. If you are not the intended recipient or the person responsible for delivering to the intended recipient, be advised that you have received this E-mail in error and that any use or copying is strictly prohibited. If you have received this E-mail in error please notify the beCogent postmaster at [EMAIL PROTECTED] Unless expressly stated, opinions in this email are those of the individual sender and not beCogent Ltd. You must take full responsibility for virus checking this email and any attachments. Please note that the content of this email or any of its attachments may contain data that falls within the scope of the Data Protection Acts and that you must ensure that any handling or processing of such data by you is fully compliant with the terms and provisions of the Data Protection Act 1984 and 1998. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Tomcat JVM GC
Ok, thanks let me work around on your ideas, and let you know in couple of days, I really appreciate your prompt replies. -Original Message- From: Dale, Matt [mailto:[EMAIL PROTECTED] Sent: Wednesday, August 25, 2004 6:31 PM To: Tomcat Users List Subject: RE: Tomcat JVM GC You should still look at the articles that I posted my reply. If you really want to use your own garbage collection then you will have to first fix the size of the certain areas within the heap. There is no way to turn off the jvm's own garbage collection, when it cannot allocate space for an object it will do a garbage collection. If there is still not enough space then it will expand the pool so that there is space, up until the maximum allowed for that pool. If you fix the size of the pools and always do a gc before the pool runs out of memory then you will be fine. If you've fixed the pools and you run out of memory then your own gc algorithm must be deficient and the JVM will do a gc anyway. I suspect that with the vast array of GC parameters available you should be able to find some that will work as well as or better than your own but thats just my opinion. -Original Message- From: Shakeel Ahmad [mailto:[EMAIL PROTECTED] Sent: 25 August 2004 14:17 To: Tomcat Users List Subject: RE: Tomcat JVM GC Actually we have our own gc mechanism which has a proven record of doing things for our application, it never lets our application go out of memory, but it works at high level, now with this robust design we have only issues from JVM's original gc work. Our calculations have proven that if JVM's gc does not work automatically then our real time nodes can work more effectively. -Original Message- From: Mats Henrikson [mailto:[EMAIL PROTECTED] Sent: Wednesday, August 25, 2004 4:46 PM To: Tomcat Users List Subject: RE: Tomcat JVM GC Its known that JVM schedular runs gc thread depending upon some concrete values, now I want to set such parameters, or my heap sizes so that the JVM schedular, ignores gc thread. We have 1.3G Ram on our server and our heap You are mistaken, you do not want it to ignore the gc thread, as you would then very fast run out of heap space, you just want to tune the garbage collector a little. To do this, read this page until you understand it: http://java.sun.com/docs/hotspot/gc1.4.2/ Then you can use the GC Portal tool to help you define the optimal GC configuration for your application: http://java.sun.com/developer/technicalArticles/Programming/GCPortal/ Of course, it could turn out that in order to improve your performance you might have to rewrite parts of your application to be less wasteful with objects. Regards, -- Mats Henrikson Unix Systems Programmer Systems Development Support Oxford University Computing Services - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
