Hi, Quick reply: 1) You can get a dump of all the threads and their stack traces by sending SIGQUIT to the jamvm process (find the process ID via ps or top), e.g. kill -3 <process ID> JamVM will dump the thread state and continue. If you launched JamVM from a terminal you can also do Ctrl-\ in the terminal, which will send SIGQUIT. 2) Attach gdb to jamvm and inspect the threads, e.g.: gdb jamvm <process ID> list all threads with: info threads then, for each interesting thread: thread <thread no> bt 3) Run JamVM with strace This will dump information about every system call being executed. However, if it takes two hours to hang this will probably be far too much information. Rob. 2009/7/15 ragoel <ragoel@xxxxxxxxxxxxxxxxxxx>: > > Problem: JAM VM hangs after running for ~2 hours. There is no response from > jetty (running on jamvm) at this time. > > The environment is: > - the jam vm version is JamVM 1.5.3 > - GNU Classpath version is 0.98 > - the GNU Classpath is build by disabling the following things as they are > not required by us: > . /configure --disable-gtk-peer --disable-plugin --disable-gconf-peer > --enable-tools > - we are running jetty 6.1.8 using the jam vm. > - we are connecting to the jetty (which is running on jamvm), through the > browser (IE7) on port 8080, but there is no response from the server. > - Our code runs fine when it is running jetty on sun jre 1.5. So it is > certain that the problem is with the jamvm > - the linux platform is: debian > - After some analysis, it seems that there is some bug in the socket library > of GNU Classpath due to which it stops responding after running for > sometime. > > Queries: Basically we are not able to do anything when the JAMVM hangs, so > could someone please tell me about how to debug the jamvm when it hangs i.e. > - Is there any hook so that we can attach something to it, > - Can we debug it remotely, > - How to enable logging in it? > - Any tool which can aid us in analyzing this problem further? > > We are stuck on this; please provide your valuable suggestions/resolutions > for the same? > -- > View this message in context: http://www.nabble.com/JAM-VM-hangs-after-running-for-%7E2-hours.-tp24494239p24494239.html > Sent from the Gnu - Classpath - General mailing list archive at Nabble.com. > > >
