On Thu, May 17, 2007 at 10:20:35AM -0600, Brian Barrett wrote:
> On the other hand, since the MPI standard explicitly says you're not
> allowed to call fork() or system() during the MPI application and
> sense the network should really cope with this in some way, if it
> further complicates t
On Thu, May 17, 2007 at 12:30:51PM -0400, Patrick Geoffray wrote:
> Jeff Squyres wrote:
> > Moving to devel; this question seems worthwhile to push out to the
> > general development community.
> >
> > I've been coming across an increasing number of customers and other
> > random OMPI users wh
On Thu, May 17, 2007 at 02:35:02PM -0400, Patrick Geoffray wrote:
> Brian Barrett wrote:
> > On the other hand, since the MPI standard explicitly says you're not
> > allowed to call fork() or system() during the MPI application and
>
> Does it ? The MPI spec says that you should not access buf
On Thu, May 17, 2007 at 02:57:22PM -0400, Patrick Geoffray wrote:
> gshipman wrote:
> >> The fork() problem is due to memory registration aggravated by
> >> registration cache. Memory registration in itself is a hack from
> >> the OS
> >> point of view, and you already know a lot about the variou
For the last several months, we have supported three modes of sending the
xcast messages used to release MPI processes from their various stage gates:
1. Direct - message sent directly to each process in a serial fashion
2. Linear - message sent serially to the daemon on each node, which then
"fa
On 5/18/07 2:06 PM, "Andrew Friedley" wrote:
> Why not use the binomial mode? I assume it is faster?
Yes, but it doesn't work right this minute (should be fixed soon), and we
would prefer to take a small step first. Linear doesn't require any major
code change, while binomial requires we mor
Hi Gleb,
Gleb Natapov wrote:
new madvice flag was implemented that allows userspace to mark certain
memory to not be copied to a child process. This memory is not mapped in
a child at all, no even VMA created for it. In the parent this memory is
Ah, that explain your previous mention of segfau
