Re: How to notify app of changed cpu/mem/io node configuration?

[Paul Jackson <pj@sgi.com>]

> But speaking with another OS which uses this approach, they found that
> vendors preferred the "run a script" approach anyway

Why are the "script" and the "signal" exclusive?  We seem to need both.

I'd expect that the 'batch manager' or such would want a "script" of its
choosing executed, as you describe.

But I also expect that a signal mechanism is required to deliver notice:

  from: the system service or its script (a batch manager, for example)

    to: the target task (a long running Fortran job, for example)

that some special code linked in the target task needs to make sense of
the situation and invoke the appropriate mbind/set_mempolicy calls.

Perhaps that "other OS" didn't have the difficulty we have of having to
get the target task to issue a call or two on its own behalf that can
not be issued 'by proxy'.

> The real killer was that we can't add signals without breaking glibc,

Yeah - I agree.  Don't count on glibc for anything.  Hence no new
signals, and expect to be overloading an existing signal for these
purposes, if it comes to that.

-- 
                          I won't rest till it's the best ...
                          Programmer, Linux Scalability
                          Paul Jackson <pj@sgi.com> 1.650.933.1373


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