Re: Tomcat 5.0.28 memory usage - garbage collection
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 tootbatoot, tootbatoot wrote: | Hi Thanks. the two applications run on their own and don't share jvm so I can | use different versions - but the webapp I have deployed in tomcat server | requires it to be either on 5.0.28 or 5.5.17 (but using j2sdk1.4.2_12) - - we | are using 5.0.28. Okay. That doesn't seem to be a problem. | thanks for clarifying the behavior of memory - do you see any performance | gains if I switch to 5.5.17 from 5.0.28. My understanding is that TC 5.5 has a better architecture, which I assume means that certain performance characteristics will be better, but the #1 reason to move from TC 5.0 to TC 5.5 is that TC 5.0 is no longer supported. Not even security patches. You should upgrade so that you will be running a version of TC supported by the developers /and/ the community. | the only problem I have on my end | i that I have to use plugin for 5.5.17 for backward compatibility to | j2sdk1.4.2_12. That's not a problem. The compatibility package was developed just for that reason. again... why are you bound to a 1.4 JVM? - -chris -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.9 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkhSlZEACgkQ9CaO5/Lv0PCE0QCeJq6vTUHvz5xgmUIZGM5QZCIW MlwAoKf1sUEZmjLKuJA8OMAO6Ic6d3HY =F75G -END PGP SIGNATURE- - 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: Tomcat 5.0.28 memory usage - garbage collection
thanks Chris - the reason we are tied to j2sdk 1.4.2_12 is because it is recommended by the the packaged webapp - we are customiznig it and we have experienced major minor version issues when we try to deploy our customized code with the packaged webapp. in short package s/w is done using j2sdk1.4.2_12 our custom layer ontop of it has to stick to that thank Christopher Schultz-2 wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 tootbatoot, tootbatoot wrote: | Hi Thanks. the two applications run on their own and don't share jvm so I can | use different versions - but the webapp I have deployed in tomcat server | requires it to be either on 5.0.28 or 5.5.17 (but using j2sdk1.4.2_12) - - we | are using 5.0.28. Okay. That doesn't seem to be a problem. | thanks for clarifying the behavior of memory - do you see any performance | gains if I switch to 5.5.17 from 5.0.28. My understanding is that TC 5.5 has a better architecture, which I assume means that certain performance characteristics will be better, but the #1 reason to move from TC 5.0 to TC 5.5 is that TC 5.0 is no longer supported. Not even security patches. You should upgrade so that you will be running a version of TC supported by the developers /and/ the community. | the only problem I have on my end | i that I have to use plugin for 5.5.17 for backward compatibility to | j2sdk1.4.2_12. That's not a problem. The compatibility package was developed just for that reason. again... why are you bound to a 1.4 JVM? - -chris -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.9 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkhSlZEACgkQ9CaO5/Lv0PCE0QCeJq6vTUHvz5xgmUIZGM5QZCIW MlwAoKf1sUEZmjLKuJA8OMAO6Ic6d3HY =F75G -END PGP SIGNATURE- - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- View this message in context: http://www.nabble.com/Tomcat-5.0.28-memory-usage---garbage-collection-tp17800619p17826655.html Sent from the Tomcat - User mailing list archive at Nabble.com. - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Tomcat 5.0.28 memory usage - garbage collection
Hi Guys - Can you please help me understand behavior of 5.0.28 tomcat. When I put load on it via my webapp - I can see the memory allocated to the process going up (in task manager) but when I kill the session of the webapp (i.e. remove the load) it does not come down. Should not the tomcat process release memory when there is no load ? thanks -- View this message in context: http://www.nabble.com/Tomcat-5.0.28-memory-usage---garbage-collection-tp17800619p17800619.html Sent from the Tomcat - User mailing list archive at Nabble.com. - 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: Tomcat 5.0.28 memory usage - garbage collection
From: tootbatoot [mailto:[EMAIL PROTECTED] Subject: Tomcat 5.0.28 memory usage - garbage collection When I put load on it via my webapp - I can see the memory allocated to the process going up (in task manager) but when I kill the session of the webapp (i.e. remove the load) it does not come down. Should not the tomcat process release memory when there is no load ? In a word, no. On most JVMs, once the virtual memory for the heap is allocated due to peak load, it stays allocated. However, you didn't tell us if you're looking at real or virtual memory numbers; the real memory can fluctuate simply because the OS chooses to page some of it out. You also didn't bother to tell us the JDK and OS you're using (likely some form of Windows), and your're running on an unsupported version of Tomcat. - 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 start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Tomcat 5.0.28 memory usage - garbage collection
Thanks. Sorry for not including the environment info - here it is: OS: Windows server 2003 SP1 jdk1.4.2_12 I am checking the numbers from task manager console and not sure whether these are virtual or real ones? how to find this, thanks. t Caldarale, Charles R wrote: From: tootbatoot [mailto:[EMAIL PROTECTED] Subject: Tomcat 5.0.28 memory usage - garbage collection When I put load on it via my webapp - I can see the memory allocated to the process going up (in task manager) but when I kill the session of the webapp (i.e. remove the load) it does not come down. Should not the tomcat process release memory when there is no load ? In a word, no. On most JVMs, once the virtual memory for the heap is allocated due to peak load, it stays allocated. However, you didn't tell us if you're looking at real or virtual memory numbers; the real memory can fluctuate simply because the OS chooses to page some of it out. You also didn't bother to tell us the JDK and OS you're using (likely some form of Windows), and your're running on an unsupported version of Tomcat. - 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 start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- View this message in context: http://www.nabble.com/Tomcat-5.0.28-memory-usage---garbage-collection-tp17800619p17801715.html Sent from the Tomcat - User mailing list archive at Nabble.com. - 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: Tomcat 5.0.28 memory usage - garbage collection
From: tootbatoot [mailto:[EMAIL PROTECTED] Subject: RE: Tomcat 5.0.28 memory usage - garbage collection jdk1.4.2_12 I'd strongly recommend upgrading to a newer JVM. 1.6 especially is noticeably faster than 1.4 and includes better heap management. You should upgrade Tomcat as well, for the similar reasons. I am checking the numbers from task manager console and not sure whether these are virtual or real ones? While you have the Processes tab displayed, click on the View menu, then Select Columns. Pick whatever you want to look at. The memory entries that don't say virtual are refer to real memory usage. - 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 start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Tomcat 5.0.28 memory usage - garbage collection
From: Caldarale, Charles R [mailto:[EMAIL PROTECTED] Subject: RE: Tomcat 5.0.28 memory usage - garbage collection I'd strongly recommend upgrading to a newer JVM. 1.6 especially is noticeably faster than 1.4 and includes better heap management. You should upgrade Tomcat as well, for the similar reasons. If you upgrade, you'll also have much better tools available (e.g., JConsole) to monitor the JVM and Tomcat. - 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 start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Tomcat 5.0.28 memory usage - garbage collection
thanks. The reason we have to stick to using this version is that it is recommended by another application that tomcat is acting as a client to. From your posts - I understand that the memory usage might show going up all the time - and it will still be ok because it is showing the heap size of jvm. Caldarale, Charles R wrote: From: tootbatoot [mailto:[EMAIL PROTECTED] Subject: RE: Tomcat 5.0.28 memory usage - garbage collection jdk1.4.2_12 I'd strongly recommend upgrading to a newer JVM. 1.6 especially is noticeably faster than 1.4 and includes better heap management. You should upgrade Tomcat as well, for the similar reasons. I am checking the numbers from task manager console and not sure whether these are virtual or real ones? While you have the Processes tab displayed, click on the View menu, then Select Columns. Pick whatever you want to look at. The memory entries that don't say virtual are refer to real memory usage. - 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 start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- View this message in context: http://www.nabble.com/Tomcat-5.0.28-memory-usage---garbage-collection-tp17800619p17802394.html Sent from the Tomcat - User mailing list archive at Nabble.com. - 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: Tomcat 5.0.28 memory usage - garbage collection
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 tootbatoot wrote: | The reason we have to stick to using this version is that it is recommended | by another application that tomcat is acting as a client to. Do you mean that your (Tomcat-hosted) application is connecting to a 3rd-party application? If they are not running in the same JVM, there should be no reason that different JVM versions cannot be used. The 3rd-party can use whatever they want (1.4?) while you run a newer version. | From your posts - I understand that the memory usage might show going up all | the time - and it will still be ok because it is showing the heap size of | jvm. Yes. The JVM generally does not request memory from the OS and then give it back, later. The JVM's memory usage for the Java heap (from the OS's perspective) will only increase. - -chris -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.9 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkhRhkoACgkQ9CaO5/Lv0PA6FgCeOrSevoJ+S7MlJuBUMpfMIJrL H9sAnRCXFHnikaIHkCb+Epj3FRj3q00M =w52N -END PGP SIGNATURE- - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
