I am using LIGGGHTS but it uses only one processor for computing. I have installed LIGGGHTS by following http://cfdem.dcs-computing.com/?q=node/1789
None of the combination like processors 1 2 1 or processors 2 1 2 works...
Don't know whether LIGGGHTS is not multi-processor because no processor settings were made during compilation. Do I need to install LIGGGHTS with some added settings or feature can be added later.
aaigner | Tue, 11/19/2013 - 11:16
Parallel computing
Hi,
How do you start your simulation? Don't forget to use mpirun, for instance,
mpirun -np 2 liggghts -in in.script
(This will only work with
processors 1 2 1
and notprocessors 2 1 2
. The latter would require '-np 4')Bests,
Andi
govind | Thu, 07/20/2017 - 09:32
Hi Andi
Hi Andi
I am following the same command for parallel but do not work. Liggghts installation is working fine for serial way but when I go for parallel via "mpirun -np 4 liggghts -in in.script" , it does not work. MPI is installed.
Govind
Sounik | Wed, 07/11/2018 - 01:27
Thank you Andi for helping.It
Thank you Andi for helping.It works perfectly.
rahulsoni | Tue, 11/19/2013 - 14:42
Thanks a lot
Thanks thanks a lot Andi. For such a very useful info.
Thanks again :)
PaulWinkler | Wed, 11/20/2013 - 13:10
Hi,
Hi,
I am interested in how many cores do you need to get a remarkable speed up. Are you pouring particles in multi core mode? Are there any differences in the distribution of the particles?
Regards,
Paul
rahulsoni | Wed, 11/20/2013 - 17:31
Paul, I think I am too small
Paul, I think I am too small to answer your question. Actually, I have not tried pouring particles in multi-core. My simulation were already on the go and I just added the processors command and restarted the simulations.
PaulWinkler | Fri, 11/22/2013 - 09:31
Oh yes, sure, as I should
Oh yes, sure, as I should know from the other posts you do lattice/create_atoms, my fault. Was hoping for a hint. ;-)
rahulsoni | Fri, 11/22/2013 - 16:33
Sorry Paul, for the
Sorry Paul, for the disappointment caused to you. Just want to mark my experience.
Actually, I am running two simulation (similar kind of) simultaneously in a laptop with i7 processor. Earlier, simulations were running with single processor. Thereafter, I assigned 4 processors to each one and I noticed the nearly doubled speed.
cstoltz | Fri, 11/22/2013 - 17:29
Paul,
Paul,
If you're looking for some benchmarks including parallelization efficiency, check out the document linked in the 'Announcements' section at the top of the page.
Regards,
Chris
rahulsoni | Fri, 11/22/2013 - 17:52
Yes I have seen that page. I
Yes I have seen that page. I may run my simulation on ALTIX ICE 8400 EX Supercomputer after sometime and hopefully I will provide some input for the same page.
govind | Thu, 07/20/2017 - 15:19
PARALLEL RUN
While running in parallel I get following error :
ERROR: Invalid dump style
Here is the dump command :
dump dmp all custom/vtk 10000 post/dump*.vtk id type type x y z ix iy iz vx vy vz fx fy fz omegax omegay omegaz radius
Govind
aaigner | Thu, 07/20/2017 - 16:00
VTK?
Did you really compile LIGGGHTS with VTK support?
If you are not sure, change the dump style from
custom/vtk
tocustom
(and the filename, e.g. post/dump_*.particles )