On Tue, 13 Jul 1999, David Malone wrote:

> I think AIX sends all running processes a magic signal (SIGDANGER?)
> which indicates that the system is short of resources, and if things
> don't improve real soon then it sends a SIGKILL. Not that I'd suggest
> that AIX does things the right way...

FYI, from InfoExplorer on an AIX 4.2.1 server:

"The system monitors the number of free paging space blocks and detects
when a paging-space shortage exists. When the number of free paging-space
blocks falls below a threshold known as the paging-space warning level,
the system informs all processes (except kprocs) of this condition by
sending the SIGDANGER signal. If the shortage continues and falls below a
second threshold known as the paging-space kill level, the system sends
the SIGKILL signal to processes that are the major users of paging space
and that do not have a signal handler for the SIGDANGER signal (the
default action for the SIGDANGER signal is to ignore the signal). The
system continues sending SIGKILL signals until the number of free
paging-space blocks is above the paging-space kill level."

Regards,

Brian

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