On Monday, 17 March 2014 at 17:39:41 UTC, Denis Shelomovskij
wrote:
Multidimensional arrays indexing and slicing syntax is finally
added [1] (thanks to Kenji Hara). So it was a good cause to
update my multidimensional arrays library implementation and
add support for the new syntax. So here we are: [2].
Also should we add it to the standard library?
[1] https://github.com/D-Programming-Language/dmd/pull/443
[2]
http://denis-sh.bitbucket.org/unstandard/unstd.multidimarray.html
First of all, thank you very much for making such nice additions
to D available for general use. I finally got around to giving
this a spin. I'm using it for a proof-of-context HPC simuation
code written in D (currently mostly experimenting with D's
features), and as such I'm interfacing with the C MPI library to
communicate between processes. The basis of the simulation is a
3D lattice, so I was eagerly awaiting a nice solution in D. So
far I've run into two things while using your library. The first
is that I need to provide void pointers to the data to the MPI
functions, so I currently hacked your code to make the _data
storage array publicly accessible and that seems to work. To give
an idea, I currently have code like this (just a snippet):
arr = multidimArray!T(nxH, nyH, nzH);
// [...] fill the array with data
// Prepare a buffer to receive a slice from another process.
rbuffer = multidimArray!T(haloSize, nyH, nzH);
// Prepare a buffer to send a slice to another process.
sbuffer = arr[$-2*haloSize-1..$ - haloSize-1, 0..$, 0..$].dup;
// Here I now use the pointer of the storage arrays to send the
buffer around.
MPI_Sendrecv(sbuffer._data.ptr, nyH * nzH, MPI_INT, M.nbx[1], 0,
rbuffer._data.ptr, nyH * nzH, mpiType, M.nbx[0], 0, M.comm,
&mpiStatus);
// Put the buffer in the correct spot in the main array.
arr[0..haloSize, 0..$, 0..$] = rbuffer;
Am I missing a nicer way to accomplish this? I like the
compactness of the code (compared to what I'm currently used to
with our F90 simulation code). Secondly, the property that
returns the dimensions of the array is called 'dimentions' (with
a t), this should be fixed.
Regards,
Stefan
