Hi Miguel, I am experiencing the same problem with my web application and the root ot the problem seems to be in the mono process that runs mod-mono-server. The curious thing is that it seems to hang every time when it consumes around 50% from the system memory. Here are some traces, I hope they help a little:
top: Tasks: 66 total, 2 running, 64 sleeping, 0 stopped, 0 zombie Cpu(s): 4.3% us, 3.7% sy, 0.0% ni, 91.7% id, 0.0% wa, 0.0% hi, 0.3% si Mem: 190940k total, 185772k used, 5168k free, 3080k buffers Swap: 72252k total, 35984k used, 36268k free, 38264k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 16019 www-data 15 0 124m 93m 8876 S 6.6 50.3 8:17.75 mono gdb: 0xb7c706c6 in semop () from /lib/tls/libc.so.6 (gdb) bt #0 0xb7c706c6 in semop () from /lib/tls/libc.so.6 #1 0xb7ecfbb7 in _wapi_shm_sem_lock () from /usr/lib/libmono.so.0 #2 0xb7ec5567 in _wapi_handle_count_signalled_handles () from /usr/lib/libmono.so.0 #3 0xb7ed3ca6 in SignalObjectAndWait () from /usr/lib/libmono.so.0 #4 0xb7ed3ed2 in WaitForMultipleObjectsEx () from /usr/lib/libmono.so.0 #5 0xb7e86b3b in mono_install_thread_callbacks () from /usr/lib/libmono.so.0 #6 0xb7e86e8a in mono_thread_manage () from /usr/lib/libmono.so.0 #7 0xb7e0c0da in mono_main () from /usr/lib/libmono.so.0 #8 0x0804857b in ?? () #9 0x00000005 in ?? () #10 0xbfc84ec4 in ?? () #11 0xbfc84e98 in ?? () #12 0xb7bac974 in __libc_start_main () from /lib/tls/libc.so.6 #13 0xb7bac974 in __libc_start_main () from /lib/tls/libc.so.6 strace: # strace -p 16019 Process 16019 attached - interrupt to quit semop(3538953, 0xbfc84b90, 1 Mono version is 1.1.13.2 mod_mono version is 1.1.13 Regards, Georgi Moskov On 4/7/06, Miguel de Icaza <[EMAIL PROTECTED]> wrote: > Hello, > > > Assuming this is the case, what on earth can I do to troubleshoot this? > > Is there something we can do in code to help the GC? I thought the > > whole point of languages like C# was to get /away/ from awful days of > > malloc + free'ing memory like in C :( > > Thanks for posting the message, we need a few more data points here. > > You mention that the application will go down within twenty minutes. By > the time it goes down, what is growing out of proportion? Is it the > Apache process with mod_mono or is it the Mono process that runs > mod-mono-server.exe? > > You mentioned that requests were being received, but they were not > getting a reply. What was the size of Mono then? > > Am curious in this particular case if this is a case of Mono leaking > memory or if this is a case of Mono running out of threads to process > responses. > > Your initial description sounds like Mono is hanging, not that Mono is > leaking. > > This could be caused by a number of reasons: the requests might not be > completing; You might be using some library that has a threadpool > leak; You might be starving and deadlocking the threadpool internally. > > Miguel. > _______________________________________________ > Mono-list maillist - [email protected] > http://lists.ximian.com/mailman/listinfo/mono-list > _______________________________________________ Mono-list maillist - [email protected] http://lists.ximian.com/mailman/listinfo/mono-list
