Marko,
i wrote a test program based on your code snippet and it works for me.
could you please :
- post a standalone test case that is ready to be compiled and ran
- which version of OpenMPI are you using ?
- which JVM are you using ? (vendor and version)
- post your full command line
Cheers,
Hi,
I want to load a saved object using java mpi. Without MPI there is no
problem in reading the file and casting it to the correct type. I tried
to open the file as a byte array and convert this to an object. I
checked that all bytes are read correctly. Here I have an example where
the saved
Hi Gilles,
Yes that’s correct – one node with 3 cores is about 1.5 minutes for a 10 second
simulation, this turns into 4 minutes when I send the job to 36 cores on 9 IP
connected nodes.
I haven’t setup an x86 cluster to do a comparison, I know this would be a lot
easier than setting up the Pis
Hi,
Yes I did, in fact the master node is an NFS server and the other 9 nodes
auto-mount it on startup. The NFS partition on the master is also a RAMdisk.
The initial method was to create the OpenFOAM case in the NFS partition and
then just point the nodes at it using wdir on the mpirun command
The code for the paper with details is in GitHub
https://github.com/DSC-SPIDAL/damds
On Sun, Jan 24, 2016 at 2:51 PM, Ibrahim Ikhlawi
wrote:
> Thanks for reply.
>
> But I want to have an imagination about the behaviour of my server.
> Therefore I need an Code which I can run it on my server.
> C
Thanks for reply.
But I want to have an imagination about the behaviour of my server. Therefore I
need an Code which I can run it on my server.
Could anyone give me an example for any code? My last code was a simple example
and not enough to get an imagination.
Thanx in advance
List-Post: users
We've looked at performance in detail with regard to OpenMPI Java for large
scale real data analytics. Here's a paper still in submission that
identifies 5 rules you'd find useful to get good performance. It talks
about how the number of processes affect performance as well. Tests were
done up 3072
*All* codes scale differently.
So you should do these tests with your own code, and not a different code
(such as MM).
2016-01-24 15:38 GMT+01:00 Ibrahim Ikhlawi :
>
>
> Hallo,
>
> I am working on a server and run java codes with OpenMPI. I want to know
> which number of process is the fastest t
Hallo,
I am working on a server and run java codes with OpenMPI. I want to know which
number of process is the fastest to run my code with?
For this reason I wrote a code that multiply two matrices but the differences
between the results is not significant.
Therefore I want to know how can I
Steve,
if I understand correctly, running on one node with 4 MPI tasks is three
times faster than running on 10 nodes with 40 (10 ?) tasks.
did you try this test on a x86 cluster and with tcp interconnect, and
did you get better performance when increasing the number of nodes ?
can you try to ru
Hi Steve.
Regarding Step 3, have you thought of using some shared storage?
NFS shared drive perhaps, or there are many alternatives!
On 23 January 2016 at 20:47, Steve O'Hara
wrote:
> Hi,
>
>
>
> I’m afraid I’m pretty new to both OpenFOAM and openMPI so please excuse me
> if my questions are eit
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