Re: [BProc] proc_pid_map badness

[<er...@he...>]

On Tue, Jul 29, 2003 at 09:50:53AM -0400, Nicholas Henke wrote:
> Hey Erik~
> 	How are things on your end? Pretty well here. 
> I am attempting to use the proc_pid_map to see all of the processes for
> a user on a remote node, so that I can use bpsh to kill them. Some of
> these processes are running via ssh, so of course they are not in the
> bproc pid space. Can you tell me where I am going wrong ?

I'm a little fuzzy on exactly what you're trying to do here.  If you
want to kill a process in the slave's process space from a process
(kill) in the master's process space, that won't work.  You can't send
signals across process spaces.  Even with process ID mapping turned
off in /proc (proc_pid_map), the mapping still happens for system
calls (fork, wait, kill).

The reason I have the option to turn off pid mapping is that it allows
you to see what's going on on the node even if you can't directly fix
it from within BProc.  I've had situations where some bit of the node
boot-up stuff was spinning eating up 20% cpu for no apparent reason
and the only way to see that was turning off pid mapping.

btw, in case it wasn't clear:

proc_pid_map == 2:  Do mapping for all users
proc_pid_map == 1:  Do mapping for users but not for root.
proc_pid_map == 0:  Do mapping for nobody.

- Erik