Is OpenMPI using Multicast for things like MPI_Bcast() ?
Some simple tests of really old versions (1.0.2) showed binary tree
type performance, while latter versions gave me the same run time no
matter how many CPU's I used.
Thus this lead me to believe that something like multicast is in
2008/12/9 Kevin Anthony Joy :
> if (rank==0) { /// REMOVE THIS IF
> MPI::COMM_WORLD.Scatter(
> stat,
> 1,
> MPI::DOUBLE,
> &test3,
> 1,
> MPI::DOUBLE,
> 0);
> }
Hi Kevin. I see you are mixing C and C++ calls. It is probably bes
Scatter is a collective operation.
You need to have all ranks in COMM_WORLD call it. Even though rank 0
is the one with the original data.
Remove the if(rank==0) block around it,
Brock Palen
www.umich.edu/~brockp
Center for Advanced Computing
bro...@umich.edu
(734)936-1985
On Dec 9, 2008,
Good Evening All,
I'm very new to using MPI; I seem to be struggling to get a basic understanding
of the MPI::Comm_World.Scatter Operation, It seem's as though a may be
misunderstanding how the scatter operation works. Suppose i have an Array of x
amount of doubles, let's say 3 doubles that i
Hi Chong,
Chong Su wrote:
Now the mpi can be used normally . But we need let the non-root user run the
MPI program too, HOW can we do ?
What type of operating system?
Generally, anyone can run mpirun and mpic/mpic++/etc. Are you unable to
do that? What kind of error message are you g
I have tried disabling the shared memory by running with the following
parameters to mpirun
--mca btl openib,self --mca btl_openib_ib_timeout 23 --mca
btl_openib_use_srq 1 --mca btl_openib_use_rd_max 2048
Unfortunately this did not get rid of any hangs and has seemed to make
them more common
The current version of Open MPI installed on ranger is 1.3a1r19685 which
is from early October. This version has a fix for ticket #1378. Ticket
#1449 is not an issue is this case because each node has 16 processors
and #1449 is for larger SMPs.
However, I am wondering if this is because of
sss
Now the mpi can be used normally . But we need let the non-root user run the
MPI program too, HOW can we do ?
###
I am a beginner for MPI and Maillist. Thanks for reply!
Hi,
1. please, provide #cat /proc/cpu_info
2. see http://www.open-mpi.org/faq/?category=tuning#paffinity-defs.
Best regards
Lenny.
Now the mpi can be used normally . But we need let the non-root user run the
MPI program too, HOW can we do ?
###
I am a beginner for MPI and Maillist. Thanks for reply!
also see https://svn.open-mpi.org/trac/ompi/ticket/1449
On 12/9/08, Lenny Verkhovsky wrote:
>
> maybe it's related to https://svn.open-mpi.org/trac/ompi/ticket/1378 ??
>
> On 12/5/08, Justin wrote:
>>
>> The reason i'd like to disable these eager buffers is to help detect the
>> deadlock bett
maybe it's related to https://svn.open-mpi.org/trac/ompi/ticket/1378 ??
On 12/5/08, Justin wrote:
>
> The reason i'd like to disable these eager buffers is to help detect the
> deadlock better. I would not run with this for a normal run but it would be
> useful for debugging. If the deadlock i
See http://www.open-mpi.org/faq/?category=tuning#setting-mca-params.
On Dec 9, 2008, at 5:18 AM, Yasmine Yacoub wrote:
Thanks for your reponse, it works this time but when I tried again
another job without the command you gave me, I got the same warning!!,
should I use this command every ti
Thanks for your reponse, it works this time but when I tried again another job
without the command you gave me, I got the same warning!!,
should I use this command every time I want to run a job? there isn't another
method to tun off this warning for ever.
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