Re: [BProc] move process at will

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

On Thu, Apr 01, 2004 at 03:04:29AM +0900, Kimitoshi Takahashi wrote:
> Hi all, 
> 
> Form what I read from Bproc documents, the process migration is volunatry,
> meaning bproc_move() must be called from the proccess to be moved.
> 
> The lovely bpsh seems to wrap non-bproc program, and cause the program to move involuntary,
> using bproc_vexecmove(), only at the begining.
> 
> I'm wondering if there is any way to cause a non-bproc procces to move involuntary any time
> at user's will.
> 
> My colleague uses a heterogeneous cluster where the memory sizes on nodes vary.
> He sometimes wants to move small process on a large memory machine 
> before he starts obviously huge proccess. He is only using bpsh to start processes.
> 
> Is it technically feasible to write a like of bpsh which always wraps a process on slave nodes, 
> and handles a "move now to where" signal ?
> 
> How would you deal with the situation my colleague has ?

I think a "wrapper" could take the form of a shared library.  You
could manually LD_PRELOAD yourself or you could modify bpsh to
automatically set LD_PRELOAD for the child processes.

A signal seems like a good way to get the process's attention but you
still need another way to tell it where to move to.  I can't think of
anything easy for that off the top of my head.

- Erik