[openib-general] Question about locked pages

[Jeff Squyres]

On Oct 31, 2005, at 12:39 PM, Roland Dreier wrote:

>     Jeff> However, it's unclear to me exactly what needs to happen --
>     Jeff> do users both need to "ulimit -l unlimited" (or some large
>     Jeff> number) *and* set /etc/sysctl.conf values for kernel.shmall
>     Jeff> and kernel.shmmax to unlimited (or a large number)?  Or does
>     Jeff> performing one of those obviate the need for the other?
>
> I believe the changing the ulimit for locked pages is all that is
> needed.  Does changing shmall and shmmax have any effect?  I thought
> those were limits on the total amount of shared memory allowed for the
> system, not limits on locked/pinned memory.

Ditto (I thought those were shmem values / didn't think they had any 
effect on Open IB).  The information that I got was third-hand, which 
is why I posted here to ask about it.  :-)

I'll remove them from the FAQ entry -- any other comments?

-- 
{+} Jeff Squyres
{+} The Open MPI Project
{+} http://www.open-mpi.org/