On Thu, Mar 15, 2007 at 11:08:40PM +0000, Hugh Dickins wrote:
> > appears to increase Committed_AS by around 200kb. But we've committed to
> > providing it with 8MB for stack.
> >
> > How come this is correct?
>
> We've no more committed to providing each instance with 8MB of stack,
> than we've committed to providing each instance with RLIMIT_AS of
> address space. The rlimits are limits, not commitments, surely?
RLIMIT_STACK only applies to the initial thread, POSIX threads have just
stack size attribute, not maximum thread stack size attribute.
If you set it explicitly with pthread_attr_setstacksize, then libpthread
will honor whatever thread stack size you want, otherwise it just uses
some default thread stack size. This happens to be in NPTL derived
from RLIMIT_STACK value, but very well could be something else.
Jakub
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