On Wed, 2011-05-18 at 00:53 +0200, Rainer Jung wrote:
> If you can find pstack, that will be easier. pstack just takes the > process id and writes out the stacks for all threads. My quick search > indicates it pstack should exist for FreeBSD. > There is a port for this but it only support i386 arch, im running amd64. http://www.freshports.org/sysutils/pstack/ > GDB allows to also get details on the values of variables used, step > through the code etc. You give gdb two arguments, the path to your httpd > binary and the process ID of the CPU consuming process. Once the gdb > prompt is shown, you can enter > > thread apply all bt full > > which will output thread and variable information for all threads. > > pstack and gdb might produce many lines of output, especially for > worker, so you might want to write the result directly to a file, e.g. > > pstack PID > /tmp/pstack.txt > > And yes, if the problem also occurs for prefork, then that makes > debugging a bit easier. I'll recompile to prefork and give GDB a go, thanks for the info.
