Yes I am sorry I should have added that in the original post. "-n 4 Hostname" prints out the names of my 4 Pis in the cluster and "...-n 16 helloworld.py" prints out as expected as shown in the attached image. So I know that those work correctly. It is just the strangest problem. If I ever specify more than 1 processes it says "you need _ number of processes to run the following tests" even though I have it set to run with said number of processes. Thank you for getting back to me so quickly. This problem is giving me grey hairs and I am only a college student. -Lanze -----Original Message----- From: Kenneth Raffenetti [mailto:[email protected]] Sent: Wednesday, May 27, 2015 8:21 AM To: [email protected] Subject: Re: [mpich-discuss] Running HPL on RPi cluster, seems like MPI is somehow not configured properly since it work with 1 node but not more Please try a simple test to ensure your mpiexec is working correctly. Something like: mpiexec -machinefile ~/machinefile -n 4 hostname That should output the hostnames of the machines you are attempting to run on. Second, you should ensure that the mpiexec and MPI library your program is linked against come from the same distribution. A common error we see is mixing MPICH's mpiexec with Open MPI's library, or vice versa. Ken On 05/26/2015 03:32 PM, Heerdt, Lanze M. 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-bench mark-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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