If you are compiling Gromacs like Compiling Gromacs-2019.3 with Intel MKL and CUDA and encounter errors similar to the ones below:

Downloading: http://gerrit.gromacs.org/download/regressiontests-2020.3.tar.gz -- [download 100% complete] CMake Error at tests/CMakeLists.txt:57 (message): error: downloading 'http://gerrit.gromacs.org/download/regressiontests-2020.3.tar.gz' failed status_code: 7 status_string: 

"Couldn't connect to server" log: Trying 130.237.25.133... TCP_NODELAY set Connected to gerrit.gromacs.org (130.237.25.133) port 80 (#0) GET /download/regressiontests-2020.3.tar.gz HTTP/1.1 Host: gerrit.gromacs.org User-Agent: curl/7.54.1 Accept: */* HTTP/1.1 302 Found Date: Mon, 28 Dec 2020 02:26:13 GMT Server: Apache/2.4.18 (Ubuntu) Location: ftp://ftp.gromacs.org/regressiontests/regressiontests-2020.3.tar.gz Content-Length: 335 Content-

Type: text/html; charset=iso-8859-1 Ignoring the response-body [335 bytes data] Connection #0 to host gerrit.gromacs.org left intact Issue another request to this URL: 'ftp://ftp.gromacs.org/regressiontests/regressiontests-2020.3.tar.gz' Trying 130.237.11.165... TCP_NODELAY set 

Connected to ftp.gromacs.org (130.237.11.165) port 21 (#1) 220 Welcome to the GROMACS FTP service. USER anonymous 331 Please specify the password. PASS ftp@example.com 230 Login successful. PWD 257 "/" is the current directory Entry path is '/' CWD regressiontests ftp_perform ends with SECONDARY: 0 250 Directory successfully changed. ..... ..... Connecting to 130.237.11.165 (130.237.11.165) port 10087 connect to 130.237.11.165 port 21 failed: Connection timed out Failed to connect to ftp.gromacs.org port 21: Connection timed out Closing connection 1

To workaround,

Step 1: Download the Relevant Test from https://ftp.gromacs.org/regressiontests/

Step 2: Untar the regression test to the Gromacs Source Directory

% tar -zxvf  egressiontests-2019.6.tar.gz

Step 3: Create a script file

% touch gromacs_gpgpu.sh

Include -DREGRESSIONTEST_DOWNLOAD=OFF -DREGRESSIONTEST_PATH=../regressiontests-2019.6

To see the whole makefile, see

CC=mpicc CXX=mpicxx cmake .. -DCMAKE_C_COMPILER=mpicc -DCMAKE_CXX_COMPILER=mpicxx -DGMX_MPI=on -DGMX_FFT_LIBRARY=mkl \
-DCMAKE_INSTALL_PREFIX=/usr/local/gromacs-2019.3_intel18_mkl_cuda11.1 -DREGRESSIONTEST_DOWNLOAD=OFF -DREGRESSIONTEST_PATH=../regressiontests-2019.6 \
-DCMAKE_C_FLAGS:STRING="-cc=icc -O3 -xHost -ip" \
-DCMAKE_CXX_FLAGS:STRING="-cxx=icpc -O3 -xHost -ip -I/usr/local/intel/2018u3/compilers_and_libraries_2018.3.222/linux/mpi/intel64/include/" \
-DGMX_GPU=on \
-DCUDA_TOOLKIT_ROOT_DIR=/usr/local/cuda-10.1 \
-DCMAKE_BUILD_TYPE=Release \
-DCUDA_HOST_COMPILER:FILEPATH=/usr/local/intel/2018u3/compilers_and_libraries_2018.3.222/linux/bin/intel64/icpc

Prerequisites

GCC-6.5 Compilers and associates libraries
m4-1.4.18
mpfr-3.1.4
cmake-3.15.1
gmp-6.1.0
mpc-1.0.3

Intel Compilers and Prerequisites

% source /usr/local/intel/2018u3/bin/compilervars.sh intel64
% source /usr/local/intel/2018u3/impi/2018.3.222/bin64/mpivars.sh intel64
% source /usr/local/intel/2018u3/mkl/bin/mklvars.sh intel64
% source /usr/local/intel/2018u3/parallel_studio_xe_2018/bin/psxevars.sh intel64
% MKLROOT=/usr/local/intel/2018u3/mkl

Create a setup file and make a build directory

% mkdir build
% touch gromacs_cpu.sh

Put the following into the gromacs_cpu.sh

CC=mpicc CXX=mpicxx cmake .. \
-DCMAKE_C_COMPILER=mpicc \
-DCMAKE_CXX_COMPILER=mpicxx \
-DGMX_MPI=on -DGMX_FFT_LIBRARY=mkl \
-DCMAKE_INSTALL_PREFIX=/usr/local/gromacs-2019.3_intel18_mkl \
-DREGRESSIONTEST_DOWNLOAD=ON \
-DCMAKE_C_FLAGS:STRING="-cc=icc -O3 -xHost -ip" \
-DCMAKE_CXX_FLAGS:STRING="-cxx=icpc -O3 -xHost -ip" -DGMX_GPU=off \
-DCMAKE_BUILD_TYPE=Release -DGMX_SIMD=AVX_512

SIMD Support can be found at http://manual.gromacs.org/current/install-guide/index.html#simd-support

% ./gromacs_cpu.sh

% make

% make install

Testing and Verification

$ source /your/installation/prefix/here/bin/GMXRC
./gmxtest.pl all -np 2