Brian Pane wrote: > Do you have a way to take a snapshot of each httpd process's stack > backtrace? On Solaris, I'd do this by running /usr/proc/bin/pstack > on each pid; I don't know if FreeBSD has a similar functionality.
ummm, let's see: [gregames@daedalus gregames]$ pstack bash: pstack: command not found [gregames@daedalus gregames]$ ls /usr/proc ls: /usr/proc: No such file or directory nope, sorry. Of course we could get backtraces with gcore, but would probably fill up the filesystem in the process. Actually, if we had a way of dumping just the two processes that own the two CPUs when we get one of these spikes, it might be feasible. Especially if the trap/shell script/whatever would exit once it did its thing, and didn't dump itself. > This would give us a picture of what all those runnable processes > are doing. The processes that aren't dispatched are probably innocent bystanders, at least until they get ahold of a CPU. But I suppose some of them could have been doing bad things in previous time slices. Greg
