yade-mpi team mailing list archive

[Janek Kozicki <janek_listy@xxxxx>]

OK, think that adding specific flag mpiRequired is better

https://gitlab.com/yade-dev/trunk/blob/master/lib/serialization/Serializable.hpp#L31


Janek Kozicki said:     (by the date of Sun, 28 Apr 2019 21:05:45 +0200)

> You could add a new flag ``mpiRequired`` to attribute flags [1] and
> by default assume that the attribute does not need to be send by mpi.
> 
> Or maybe this flag is simply ``noSave`` and ``readonly`` and
> ``hidden`` flags together? This can be possible. Why send over mpi
> something that does not need to be saved? Why send something
> readonly? Why send something hidden from GUI inspect?
> 
> 
> [1] https://gitlab.com/yade-dev/trunk/blob/master/lib/serialization/Serializable.hpp#L31
> 
> Janek
> 
> 
> 
> Deepak Kn said:     (by the date of Sun, 28 Apr 2019 19:57:54 +0200)
> 
> > Hello All,
> > 
> > I have finished implementing the functions to serialize and deserialize the
> > bodies and the necessary communications to exchange the serialized bodies.
> > The serialized messages (binary) are several times larger than the usual
> > (state) messages in mpy/mpf.py (vel,pos, ori, id, bounds) etc. And as a
> > result the simulations are far slower ! Here's how it scales : for
> > exchanging 220 bodies, the serialized messages were around 215456 elements
> > (chars), and in the previous versions, the message sizes were 4180
> > (doubles). (testMPI2D no merge, on 3 procs, 20000 bodies.)
> > 
> > Most of the functions are implemented in Subdomain.cpp Subdomain.hpp and
> > MPIBodyContainer.hpp, (branch : mpi_dpk on gitlab) I followed the same
> > logic of the previous version (mpy/mpf), non blocking sends and blocking
> > recvs (with probes) are used for the communications between the workers,
> > and blocking communication for sending the forces to the master (the same
> > as in mpy/mpf).
> > 
> > I think this can be improved, we can serialize the states,bounds and send
> > these instead of the bodies? what do you think? (all the functions do
> > serialize, deserialize and communicate are ready. We just need a container
> > to hold only the required info.)  
> 
> -- 
> Mailing list: https://launchpad.net/~yade-mpi
> Post to     : yade-mpi@xxxxxxxxxxxxxxxxxxx
> Unsubscribe : https://launchpad.net/~yade-mpi
> More help   : https://help.launchpad.net/ListHelp


-- 
Janek Kozicki                               http://janek.kozicki.pl/  |