NTPoly available on conda-forge

[awvwgk]

I recently packaged NTPoly for the conda package manager. It is now available on the conda-forge channel for Linux and MacOS. For more details visit the NTPoly feedstock.

[william-dawson]

Thank you for this very interesting work.

I wanted to try out using NTPoly as a library from conda, but ran into some trouble. To start, I created a new conda environment:

conda create --name ntpoly-from-conda 
conda activate ntpoly-from-conda
conda install -c conda-forge ntpoly  

Then I thought I could create a simple driver program main.f90:

PROGRAM main
  USE ProcessGridModule
  USE MPI
  IMPLICIT NONE
  INTEGER :: provided, ierr

  !! Start Up
  CALL MPI_Init_thread(MPI_THREAD_SERIALIZED, provided, ierr)
  CALL ConstructProcessGrid(MPI_COMM_WORLD)

  !! Shut Down
  CALL DestructProcessGrid
  CALL MPI_Finalize(ierr)

END PROGRAM

To compile it, I supposed I needed to install gfortran into the conda environment:

conda install -c conda-forge gfortran 

But when I compile the code:

mpif90 main.f90 -o conda

I get an error (Mac OSX):

Undefined symbols for architecture x86_64:
  "___processgridmodule_MOD_constructprocessgrid_onlyslice", referenced from:
      _MAIN__ in ccERnuVa.o
  "___processgridmodule_MOD_destructprocessgrid", referenced from:
      _MAIN__ in ccERnuVa.o
ld: symbol(s) not found for architecture x86_64
collect2: error: ld returned 1 exit status

Ubuntu:

/home/wddawson/miniconda3/envs/ntpoly-from-conda/bin/../lib/gcc/x86_64-conda-linux-gnu/11.2.0/../../../../x86_64-conda-linux-gnu/bin/ld: 
/tmp/ccZvu3jg.o: in function `MAIN__':
main.f90:(.text+0x37): undefined reference to 
`__processgridmodule_MOD_constructprocessgrid_onlyslice'
/home/wddawson/miniconda3/envs/ntpoly-from-conda/bin/../lib/gcc/x86_64-conda-linux-gnu/11.2.0/../../../../x86_64-conda-linux-gnu/bin/ld: 
main.f90:(.text+0x41): undefined reference to 
`__processgridmodule_MOD_destructprocessgrid'
collect2: error: ld returned 1 exit status

I guess that installing gfortran from conda was the wrong step, and there are incompatibilities. Do you think there is a solution to this issue?

[awvwgk]

I think you forgot to link with the library:

mpif90 main.f90 -o test -lNTPoly
mpirun -n 2 ./test

For using conda-forge's MPI, we will also need conda-forge's GCC to use the compiler wrappers. Since it is compiled with GCC 9.3 it should be upwards compatible up to GCC 11. The MPICH build also allows usage of any external compatible MPI implementation.

[william-dawson]

Haha, that was a silly mistake on my part, thanks! My plan is to write a news report on the NTPoly website about this feature so thanks for the details!

[awvwgk]

You are of course welcome to become a maintainer at conda-forge if you like. Most of the process is automated, e.g. if you release a new version here there will be an automatic bump at the feedstock repo by a bot, meaning that it does not require much effort and time to maintain a feedstock.

Just open an issue at the feedstock as described here:
https://conda-forge.org/docs/maintainer/infrastructure.html#conda-forge-admin-please-add-user-username