First you can run
mpirun -machinefile ~/machinefile -np 4 -tag-output xhpl
if all tasks report they believe they are task 0, then this is the
origin of the problem.
then you can run
ldd mpirun
ldd xphl
they should use the same mpi flavor
then
mpirun -machinefile ~/machinefile -np 4 -tag-output ldd xhpl
and make sure xhpl use the very same mpi flavor all the nodes
HPL make process can be error prone, especially if you modify some
config file / arch in the middle.
a simple option is to rebuild xhpl from scratch and with OpenMPI
you can also post your HPL.dat and i will have a look
Cheers,
Gilles
On 5/27/2015 10:38 AM, Heerdt, Lanze M. wrote:
I have run a hello world program for any number of processes. If I say
“–n 16” I get 4 responses from each node saying “Hello world! I am
process (0-15) of 16 on RPI-0(1-4)” so I know the cluster Can work how
I want it to. I also tested with just normal hostname and I see the
names of each of the 4 Pis as a response.
As a response to the illegal entry in HPL.dat, that doesn’t really
make much sense since I run it just fine with p =1 and q =1, it only
says that when I change p and q to 2, which I know is not an illegal entry
*From:*users [mailto:users-boun...@open-mpi.org] *On Behalf Of *Gilles
Gouaillardet
*Sent:* Tuesday, May 26, 2015 8:14 PM
*To:* Open MPI Users
*Subject:* Re: [OMPI users] Running HPL on RPi cluster, seems like MPI
is somehow not configured properly since it work with 1 node but not more
At first glance, it seems all mpi tasks believe they are rank zero and
comm world size is 1 (!)
Did you compile xhpl with OpenMPI (and not a stub library for serial
version only) ?
can you make sure there is nothing wrong with your LD_LIBRARY_PATH and
you do not mix MPI librairies
(e.g. OpenMPI mpirun but xhpl ends up using mpich, or the other way
around)
As already suggested by Ralph, i would start by running a hello world
program
(just print rank and size to confirm it works)
Cheers,
Gilles
On 5/27/2015 8:42 AM, Ralph Castain wrote:
I don't know enough about HPL to resolve the problem. However, I
would suggest that you first just try to run the example programs
in the examples directory to ensure you have everything working.
If they work, then the problem is clearly in the HPL arena.
I do note that your image reports that you have an illegal entry
in HPL.dat - if the examples work, you might start there.
On Tue, May 26, 2015 at 12:26 PM, Heerdt, Lanze M.
<heerdt...@gcc.edu <mailto:heerdt...@gcc.edu>> wrote:
I realize this may be a bit off topic, but since what I am
doing seems to be a pretty commonly done thing I am hoping to
find someone who has done it before/can help since I’ve been
at my wits end for so long they are calling me Mr. Whittaker.
I am trying to run HPL on a Raspberry Pi cluster. I used the
following guides to get to where I am now:
http://www.tinkernut.com/2014/04/make-cluster-computer/
http://www.tinkernut.com/2014/05/make-cluster-computer-part-2/
https://www.howtoforge.com/tutorial/hpl-high-performance-linpack-benchmark-raspberry-pi/#comments
and a bit of:
https://www.raspberrypi.org/forums/viewtopic.php?p=301458#p301458
when the above guide wasn’t working
basically when I run: “mpiexec -machinefile ~/machinefile -n 1
xhpl” it works just fine
but when I run “mpiexec -machinefile ~/machinefile -n 4 xhpl”
it errors with the attached image. (if I use “mpirun…” I get
the exact same behavior)
[Note: I HAVE changed the HPL.dat to have “2 Ps” and “2
Qs” from 1 and 1 for when I try to run it with 4 processes]
This is for a project of mine which I need done by the end of
the week so if you see this after 5/29 thank you but don’t
bother responding
I have hpl-2.1, mpi4py-1.3.1, mpich-3.1, and openmpi-1.8.5 at
my disposal
In the machinefile are the 4 IP addresses of my 4 RPi nodes
10.15.106.107
10.15.101.29
10.15.106.108
10.15.101.30
Any other information you need I can easily get to you so
please do not hesitate to ask. I have nothing else to do but
try and get this to work :P
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