Attach: /rc/bin/tap if something hangs, theres a good opportunity to figure out what is happening by looking in what state the various processes of the horde are using acid or acid -k.
this does require knowledge of wich process waits for whom. for simple await() relationship, it is easy. there are various pstree programs arround for plan9. for process pipelines, i'v written the program tap (attached to this mail) that walks the filedescriptor table of a process, checks for a pipe and then searches /proc for other processes having the other end of that pipe open doing this recursively. deadlocked fileservers are harder to track down. if these hang conditions are reproducable, you might also try stuff like rons ratrace. good luck :) -- cinap
