Re: NIO 100% CPU usage
Filip, How do your top or ps commands relate to threads in the thread dump? Are there shared ids or shared names in there? I'm searching for this for some time, so am really interested in what you mean. Ronald. Op woensdag, 15 oktober 2008 om 20:22 uur schreef Tomcat Users List users@tomcat.apache.org: Subject: Re: NIO 100% CPU usage Date: Wed Oct 15 20:22:43 CEST 2008 From: Filip Hanik - Dev Lists [EMAIL PROTECTED] ok, when you reproduce it, you don't really need a profiler, you can do a top with threads on, or a ps -efL, and from those, you can look into a thread dump I've never been able to reproduce the issue, so if you have a system, or if you want to work with me, ping me offline at fhanik at apache dot org Filip Matías Rojas wrote: It's 6.0.18 -Original Message- From: Filip Hanik - Dev Lists [mailto:[EMAIL PROTECTED] Sent: miércoles, 15 de octubre de 2008 07:25 p.m. To: Tomcat Users List Subject: Re: NIO 100% CPU usage what version of tomcat are you using? Filip Matías Rojas wrote: Hi Filip, Thanks for your response. I can only reproduce it on production, where we are running a Linux 2.6 Kernel with JDK 6 update 7. After a high load it is still running at 100% CPU usage (sometimes 200% or 300% taking 2 or 3 cores). Today I'll try to do some profiling to detect the exact cause, but the bug I mentioned before sound like a possible cause to me. I understand that you said that the bug is not fixed in JDK 6 update 7? It's strange because here http://java.sun.com/javase/6/webnotes/ReleaseNotes.html it says that the bug is fixed. Thanks, Matías -Original Message- From: Filip Hanik - Dev Lists [mailto:[EMAIL PROTECTED] Sent: martes, 14 de octubre de 2008 08:16 p.m. To: Tomcat Users List Subject: Re: NIO 100% CPU usage hi Matías, I have not yet found a way to reproduce it to put in a work around so even though its not fixed in 1.5 and 1.6, we can make it work. If you want to work with me, we can make that happen, assuming you have a way to reproduce this Filip Matías Rojas wrote: Hello, I'm experiencing a problem with NIO in Tomcat, maybe related to this issue: Selector doesn't block on Selector.select(timeout) (lnx) http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6403933 I'm using JDK 6 update 7 and it seems not to be fixed, does anybody have the same problem? When in heavy load, CPU usage goes to 100% and the only way to go back to normal is restarting Tomcat. Thanks, Matías - 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] - 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] - 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: NIO 100% CPU usage
Ronald, thread dumps contain the native ID of threads, and ps can output such IDs as well, so you can match the output together. Been there, done that. On Thu, Oct 16, 2008 at 7:16 PM, Ronald Klop [EMAIL PROTECTED]wrote: Filip, How do your top or ps commands relate to threads in the thread dump? Are there shared ids or shared names in there? I'm searching for this for some time, so am really interested in what you mean. Ronald. Op woensdag, 15 oktober 2008 om 20:22 uur schreef Tomcat Users List users@tomcat.apache.org: Subject: Re: NIO 100% CPU usage Date: Wed Oct 15 20:22:43 CEST 2008 From: Filip Hanik - Dev Lists [EMAIL PROTECTED] ok, when you reproduce it, you don't really need a profiler, you can do a top with threads on, or a ps -efL, and from those, you can look into a thread dump I've never been able to reproduce the issue, so if you have a system, or if you want to work with me, ping me offline at fhanik at apache dot org Filip Matías Rojas wrote: It's 6.0.18 -Original Message- From: Filip Hanik - Dev Lists [mailto:[EMAIL PROTECTED] Sent: miércoles, 15 de octubre de 2008 07:25 p.m. To: Tomcat Users List Subject: Re: NIO 100% CPU usage what version of tomcat are you using? Filip Matías Rojas wrote: Hi Filip, Thanks for your response. I can only reproduce it on production, where we are running a Linux 2.6 Kernel with JDK 6 update 7. After a high load it is still running at 100% CPU usage (sometimes 200% or 300% taking 2 or 3 cores). Today I'll try to do some profiling to detect the exact cause, but the bug I mentioned before sound like a possible cause to me. I understand that you said that the bug is not fixed in JDK 6 update 7? It's strange because here http://java.sun.com/javase/6/webnotes/ReleaseNotes.html it says that the bug is fixed. Thanks, Matías -Original Message- From: Filip Hanik - Dev Lists [mailto:[EMAIL PROTECTED] Sent: martes, 14 de octubre de 2008 08:16 p.m. To: Tomcat Users List Subject: Re: NIO 100% CPU usage hi Matías, I have not yet found a way to reproduce it to put in a work around so even though its not fixed in 1.5 and 1.6, we can make it work. If you want to work with me, we can make that happen, assuming you have a way to reproduce this Filip Matías Rojas wrote: Hello, I'm experiencing a problem with NIO in Tomcat, maybe related to this issue: Selector doesn't block on Selector.select(timeout) (lnx) http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6403933 I'm using JDK 6 update 7 and it seems not to be fixed, does anybody have the same problem? When in heavy load, CPU usage goes to 100% and the only way to go back to normal is restarting Tomcat. Thanks, Matías - 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] - 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] - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- Houston, we have a problem.
Re: NIO 100% CPU usage
Jerome Jar schrieb: Ronald, thread dumps contain the native ID of threads, and ps can output such IDs as well, so you can match the output together. Been there, done that. L flag for ps shows all threads and contains thread numbers, usually numerically starting above the PID, but IDs of threads generated much later than the process might have higher offsets. Java Thread Dump contains nid and tid. Depending on the platform and JVM, one of the two is the Thread ID from ps, often in Hex. Regards, Rainer On Thu, Oct 16, 2008 at 7:16 PM, Ronald Klop [EMAIL PROTECTED]wrote: Filip, How do your top or ps commands relate to threads in the thread dump? Are there shared ids or shared names in there? I'm searching for this for some time, so am really interested in what you mean. Ronald. - 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: NIO 100% CPU usage
in the thread dump, the first line for each thread has nid=0x574 this is the hex value for the kernel thread identifier. transform this into a decimal value, if you do a top (and show threads, each thread will have a PID) that pid corresponds to nid same thing if you do ps, you can get LWP id, and that corresponds to the nid Filip Ronald Klop wrote: Filip, How do your top or ps commands relate to threads in the thread dump? Are there shared ids or shared names in there? I'm searching for this for some time, so am really interested in what you mean. Ronald. Op woensdag, 15 oktober 2008 om 20:22 uur schreef Tomcat Users List users@tomcat.apache.org: Subject: Re: NIO 100% CPU usage Date: Wed Oct 15 20:22:43 CEST 2008 From: Filip Hanik - Dev Lists [EMAIL PROTECTED] ok, when you reproduce it, you don't really need a profiler, you can do a top with threads on, or a ps -efL, and from those, you can look into a thread dump I've never been able to reproduce the issue, so if you have a system, or if you want to work with me, ping me offline at fhanik at apache dot org Filip Matías Rojas wrote: It's 6.0.18 -Original Message- From: Filip Hanik - Dev Lists [mailto:[EMAIL PROTECTED] Sent: miércoles, 15 de octubre de 2008 07:25 p.m. To: Tomcat Users List Subject: Re: NIO 100% CPU usage what version of tomcat are you using? Filip Matías Rojas wrote: Hi Filip, Thanks for your response. I can only reproduce it on production, where we are running a Linux 2.6 Kernel with JDK 6 update 7. After a high load it is still running at 100% CPU usage (sometimes 200% or 300% taking 2 or 3 cores). Today I'll try to do some profiling to detect the exact cause, but the bug I mentioned before sound like a possible cause to me. I understand that you said that the bug is not fixed in JDK 6 update 7? It's strange because here http://java.sun.com/javase/6/webnotes/ReleaseNotes.html it says that the bug is fixed. Thanks, Matías -Original Message- From: Filip Hanik - Dev Lists [mailto:[EMAIL PROTECTED] Sent: martes, 14 de octubre de 2008 08:16 p.m. To: Tomcat Users List Subject: Re: NIO 100% CPU usage hi Matías, I have not yet found a way to reproduce it to put in a work around so even though its not fixed in 1.5 and 1.6, we can make it work. If you want to work with me, we can make that happen, assuming you have a way to reproduce this Filip Matías Rojas wrote: Hello, I'm experiencing a problem with NIO in Tomcat, maybe related to this issue: Selector doesn't block on Selector.select(timeout) (lnx) http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6403933 I'm using JDK 6 update 7 and it seems not to be fixed, does anybody have the same problem? When in heavy load, CPU usage goes to 100% and the only way to go back to normal is restarting Tomcat. Thanks, Matías - 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] - 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] - 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
RE: NIO 100% CPU usage
Hi Filip, Thanks for your response. I can only reproduce it on production, where we are running a Linux 2.6 Kernel with JDK 6 update 7. After a high load it is still running at 100% CPU usage (sometimes 200% or 300% taking 2 or 3 cores). Today I'll try to do some profiling to detect the exact cause, but the bug I mentioned before sound like a possible cause to me. I understand that you said that the bug is not fixed in JDK 6 update 7? It's strange because here http://java.sun.com/javase/6/webnotes/ReleaseNotes.html it says that the bug is fixed. Thanks, Matías -Original Message- From: Filip Hanik - Dev Lists [mailto:[EMAIL PROTECTED] Sent: martes, 14 de octubre de 2008 08:16 p.m. To: Tomcat Users List Subject: Re: NIO 100% CPU usage hi Matías, I have not yet found a way to reproduce it to put in a work around so even though its not fixed in 1.5 and 1.6, we can make it work. If you want to work with me, we can make that happen, assuming you have a way to reproduce this Filip Matías Rojas wrote: Hello, I'm experiencing a problem with NIO in Tomcat, maybe related to this issue: Selector doesn't block on Selector.select(timeout) (lnx) http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6403933 I'm using JDK 6 update 7 and it seems not to be fixed, does anybody have the same problem? When in heavy load, CPU usage goes to 100% and the only way to go back to normal is restarting Tomcat. Thanks, Matías - 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: NIO 100% CPU usage
what version of tomcat are you using? Filip Matías Rojas wrote: Hi Filip, Thanks for your response. I can only reproduce it on production, where we are running a Linux 2.6 Kernel with JDK 6 update 7. After a high load it is still running at 100% CPU usage (sometimes 200% or 300% taking 2 or 3 cores). Today I'll try to do some profiling to detect the exact cause, but the bug I mentioned before sound like a possible cause to me. I understand that you said that the bug is not fixed in JDK 6 update 7? It's strange because here http://java.sun.com/javase/6/webnotes/ReleaseNotes.html it says that the bug is fixed. Thanks, Matías -Original Message- From: Filip Hanik - Dev Lists [mailto:[EMAIL PROTECTED] Sent: martes, 14 de octubre de 2008 08:16 p.m. To: Tomcat Users List Subject: Re: NIO 100% CPU usage hi Matías, I have not yet found a way to reproduce it to put in a work around so even though its not fixed in 1.5 and 1.6, we can make it work. If you want to work with me, we can make that happen, assuming you have a way to reproduce this Filip Matías Rojas wrote: Hello, I'm experiencing a problem with NIO in Tomcat, maybe related to this issue: Selector doesn't block on Selector.select(timeout) (lnx) http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6403933 I'm using JDK 6 update 7 and it seems not to be fixed, does anybody have the same problem? When in heavy load, CPU usage goes to 100% and the only way to go back to normal is restarting Tomcat. Thanks, Matías - 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] - 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: NIO 100% CPU usage
It's 6.0.18 -Original Message- From: Filip Hanik - Dev Lists [mailto:[EMAIL PROTECTED] Sent: miércoles, 15 de octubre de 2008 07:25 p.m. To: Tomcat Users List Subject: Re: NIO 100% CPU usage what version of tomcat are you using? Filip Matías Rojas wrote: Hi Filip, Thanks for your response. I can only reproduce it on production, where we are running a Linux 2.6 Kernel with JDK 6 update 7. After a high load it is still running at 100% CPU usage (sometimes 200% or 300% taking 2 or 3 cores). Today I'll try to do some profiling to detect the exact cause, but the bug I mentioned before sound like a possible cause to me. I understand that you said that the bug is not fixed in JDK 6 update 7? It's strange because here http://java.sun.com/javase/6/webnotes/ReleaseNotes.html it says that the bug is fixed. Thanks, Matías -Original Message- From: Filip Hanik - Dev Lists [mailto:[EMAIL PROTECTED] Sent: martes, 14 de octubre de 2008 08:16 p.m. To: Tomcat Users List Subject: Re: NIO 100% CPU usage hi Matías, I have not yet found a way to reproduce it to put in a work around so even though its not fixed in 1.5 and 1.6, we can make it work. If you want to work with me, we can make that happen, assuming you have a way to reproduce this Filip Matías Rojas wrote: Hello, I'm experiencing a problem with NIO in Tomcat, maybe related to this issue: Selector doesn't block on Selector.select(timeout) (lnx) http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6403933 I'm using JDK 6 update 7 and it seems not to be fixed, does anybody have the same problem? When in heavy load, CPU usage goes to 100% and the only way to go back to normal is restarting Tomcat. Thanks, Matías - 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] - 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: NIO 100% CPU usage
ok, when you reproduce it, you don't really need a profiler, you can do a top with threads on, or a ps -efL, and from those, you can look into a thread dump I've never been able to reproduce the issue, so if you have a system, or if you want to work with me, ping me offline at fhanik at apache dot org Filip Matías Rojas wrote: It's 6.0.18 -Original Message- From: Filip Hanik - Dev Lists [mailto:[EMAIL PROTECTED] Sent: miércoles, 15 de octubre de 2008 07:25 p.m. To: Tomcat Users List Subject: Re: NIO 100% CPU usage what version of tomcat are you using? Filip Matías Rojas wrote: Hi Filip, Thanks for your response. I can only reproduce it on production, where we are running a Linux 2.6 Kernel with JDK 6 update 7. After a high load it is still running at 100% CPU usage (sometimes 200% or 300% taking 2 or 3 cores). Today I'll try to do some profiling to detect the exact cause, but the bug I mentioned before sound like a possible cause to me. I understand that you said that the bug is not fixed in JDK 6 update 7? It's strange because here http://java.sun.com/javase/6/webnotes/ReleaseNotes.html it says that the bug is fixed. Thanks, Matías -Original Message- From: Filip Hanik - Dev Lists [mailto:[EMAIL PROTECTED] Sent: martes, 14 de octubre de 2008 08:16 p.m. To: Tomcat Users List Subject: Re: NIO 100% CPU usage hi Matías, I have not yet found a way to reproduce it to put in a work around so even though its not fixed in 1.5 and 1.6, we can make it work. If you want to work with me, we can make that happen, assuming you have a way to reproduce this Filip Matías Rojas wrote: Hello, I'm experiencing a problem with NIO in Tomcat, maybe related to this issue: Selector doesn't block on Selector.select(timeout) (lnx) http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6403933 I'm using JDK 6 update 7 and it seems not to be fixed, does anybody have the same problem? When in heavy load, CPU usage goes to 100% and the only way to go back to normal is restarting Tomcat. Thanks, Matías - 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] - 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] - 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: NIO 100% CPU usage
hi Matías, I have not yet found a way to reproduce it to put in a work around so even though its not fixed in 1.5 and 1.6, we can make it work. If you want to work with me, we can make that happen, assuming you have a way to reproduce this Filip Matías Rojas wrote: Hello, I'm experiencing a problem with NIO in Tomcat, maybe related to this issue: Selector doesn't block on Selector.select(timeout) (lnx) http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6403933 I'm using JDK 6 update 7 and it seems not to be fixed, does anybody have the same problem? When in heavy load, CPU usage goes to 100% and the only way to go back to normal is restarting Tomcat. Thanks, Matías - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
