Re: [BProc] priority control

[Kimitoshi T. <kt...@cl...>]

Sorry for the very slow response.

er...@he... wrote:
>> I still can't understand why I couldn't bpsh renice, 
>> since the PID on the slave was obtained  by "bpsh 1 ps -ef" and hence it should be local pid.  
>> Would you elaborate a little more ?
>
>When you do a ps on the slave node (via bpsh) you see the same process
>IDs that the front end sees.  You'll note that a process doesn't
>appear to change its PID when it moves to the back end.  The proc file
>system is modified to show the pids that the front end sees.  This way
>everything stays consistent when processes move around.  The slave
>node has different process IDs internally but you don't see those.

Thank you very much for the explanation.

>You can see them if you turn off the PID mapping in /proc like this:
>
>bpsh 1 -O /proc/sys/bproc/proc_pid_map echo 0
>
>Putting a zero in that file turns off PID mapping.  1 means map for
>non-root.  2 means map for everybody.  It defaults to 2.  If you turn
>it off, then you get to see everything on the node.  You should be
>able to see that the real pid is in that case.  If you use the real
>pid, then I think renice should work.

This worked. Thank you again.

Kimitoshi Takahashi