Hi,
I've a problem with shared memory. When my application runs using pure
message passing (one process for node), it terminates and returns correct
results. When 2 processes share a node and use shared memory for exchanges
messages, my application don't terminate. At shell I write "mpirun -nolocal
stain
>
> On Mar 26, 2011, at 11:34 AM, Michele Marena wrote:
>
> > Hi,
> > I've a problem with shared memory. When my application runs using pure
> message passing (one process for node), it terminates and returns correct
> results. When 2 processes share a nod
No, I can't. I'm not a administrator of the cluster and I'm not the owner.
2011/3/26 Ralph Castain
> Can you update to a more recent version? That version is several years
> out-of-date - we don't even really support it any more.
>
>
> On Mar 26, 2011, at 1:0
h just
>
> -mca btl self,tcp
>
> and shared memory won't be used. It will run a tad slower that way, but at
> least your app will complete.
>
>
> On Mar 26, 2011, at 2:30 PM, Reuti wrote:
>
> > Am 26.03.2011 um 21:16 schrieb Michele Marena:
> >
> >>
Hi,
My application performs good without shared memory utilization, but with
shared memory I get performance worst than without of it.
Do I make a mistake? Don't I pay attention to something?
I know OpenMPI uses /tmp directory to allocate shared memory and it is in
the local filesystem.
I thank yo
(workers). Two
processes on node-1-17 communicate each other.
2011/3/27 Michele Marena
> Hi,
> My application performs good without shared memory utilization, but with
> shared memory I get performance worst than without of it.
> Do I make a mistake? Don't I pay attention to so
gt;
> On Mar 27, 2011, at 10:33 AM, Ralph Castain wrote:
>
> >
> > On Mar 27, 2011, at 7:37 AM, Tim Prince wrote:
> >
> >> On 3/27/2011 2:26 AM, Michele Marena wrote:
> >>> Hi,
> >>> My application performs good without shared memory utiliza
Each node have two processors (no dual-core).
2011/3/28 Michele Marena
> However, I thank you Tim, Ralh and Jeff.
> My sequential application runs in 24s (wall clock time).
> My parallel application runs in 13s with two processes on different nodes.
> With shared memory, when two p
tcp?
>
> Eg, when both procs are on the same node, are you thrashing caches or
> memory?
>
> Sent from my phone. No type good.
>
> On Mar 28, 2011, at 6:27 AM, "Michele Marena"
> wrote:
>
> However, I thank you Tim, Ralh and Jeff.
> My sequential applicat
ameter is used to turn on warning messages
when certain NICs are not used
2011/3/28 Ralph Castain
> The fact that this exactly matches the time you measured with shared memory
> is suspicious. My guess is that you aren't actually using shared memory at
> all.
>
> Does y
neck here.
>
>
> On Mar 28, 2011, at 9:41 AM, Michele Marena wrote:
>
> > I run ompi_info --param btl sm and this is the output
> >
> > MCA btl: parameter "btl_base_debug" (current value: "0")
> >
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