I think I "may" have found the cause of the problem with HPROF. A CTRL+BREAK (on win32) is what triggers the dump of the hprof data to a text file, but when running Tomcat as a win32 service it automatically sets the -Xrs JVM option which causes the JVM to ignore these signals from the OS (this is required to prevent Tomcat from dying when the console user logs off.. which triggers a CTRL+C from Windows).
That, plus this obscure reference<http://docs.sun.com/app/docs/doc/819-2634/6n4tl5koa?a=view>which states: "Do not use the -Xrs flag." But does not really explain why. So if I assume the hprof data is not being dumped because of the -Xrs command, then I need to run Tomcat without this. Of course this creates a serious problem for me as I need it to run for a while so I get accurate telemetry, and of course I can't log off the console otherwise the process will die, but I am using remote desktop which will automatically log me off after a timeout. Might try vnc Anyone got any other bright ideas? On 5/8/07, Filip Hanik - Dev Lists <[EMAIL PROTECTED]> wrote:
maybe try to run it under another service manager, like the Java Service Wrapper http://people.apache.org/~fhanik/wrapper.html to rule out the case, that its a win service problem Filip Jason Polites wrote: > Hi all, > > I am running Tomcat 5.5.23 on a Win32 platform as an NT Service, with the > native DLL. > > I am experiencing the CPU spinning at 100% in our production environment, > which is not something I have seen in our dev or staging env. In > order to > determine the problem area, I have tried running Tomcat with hprof > using the > following JVM option: > > -Xrunhprof:cpu=samples,thread=y > > I am setting this in the Java options tab of the Windows service > dialog. I > get a java.hprof.txt file created in the root tomcat directory, but > there is > nothing in it other than the standard intro text. > > This works when I run tomcat locally within eclipse (same tomcat > version); > but when running in production I get no data! > > This is really frustrating as I can't fix the CPU problem because I can't > identify it. > > Help! > > Thanks. > > ------------------------------------------------------------------------ > > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.5.467 / Virus Database: 269.6.2/787 - Release Date: 5/3/2007 2:11 PM > --------------------------------------------------------------------- To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
