add custom easyblock for NCCL (built from source)

easybuild/easyblocks/n/nccl.py

@@ -0,0 +1,66 @@
+##
+# Copyright 2021-2021 Ghent University
+#
+# This file is part of EasyBuild,
+# originally created by the HPC team of Ghent University (http://ugent.be/hpc/en),
+# with support of Ghent University (http://ugent.be/hpc),
+# the Flemish Supercomputer Centre (VSC) (https://www.vscentrum.be),
+# Flemish Research Foundation (FWO) (http://www.fwo.be/en)
+# and the Department of Economy, Science and Innovation (EWI) (http://www.ewi-vlaanderen.be/en).
+#
+# https://github.com/easybuilders/easybuild
+#
+# EasyBuild is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation v2.
+#
+# EasyBuild is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with EasyBuild.  If not, see <http://www.gnu.org/licenses/>.
+##
+"""
+EasyBuild support for building NCCL, implemented as an easyblock
+
+@author: Simon Branford (University of Birmingham)
+"""
+from easybuild.easyblocks.generic.configuremake import ConfigureMake
+from easybuild.tools.config import build_option
+
+
+class EB_NCCL(ConfigureMake):
+    """Support for building NCCL."""
+
+    def configure_step(self):
+        """NCCL has no configure step"""
+        pass
+
+    def build_step(self):
+        """Build NCCL"""
+        # NCCL builds for all supported CUDA compute capabilities by default
+        # If cuda_compute_capabilities is specified then we override this with the selected options
+
+        # list of CUDA compute capabilities to use can be specifed in three ways (where 3 overrules 2 overrules 1):
+        # (1) in the easyconfig file, via the custom cuda_compute_capabilities;
+        # (2) via the EasyBuild environment variable EASYBUILD_CUDA_COMPUTE_CAPABILITIES;
+        # (3) in the EasyBuild configuration, via --cuda-compute-capabilities configuration option;
+        cuda_cc = build_option('cuda_compute_capabilities') or self.cfg['cuda_compute_capabilities']
+
+        nvcc_gencode = []
+        for cc in cuda_cc:
+            add = cc.replace('.', '')
+            nvcc_gencode.append('-gencode=arch=compute_%s,code=sm_%s' % (add, add))
+
+        if nvcc_gencode:
+            self.cfg.update('buildopts', 'NVCC_GENCODE="%s"' % ' '.join(nvcc_gencode))
+
+        super(EB_NCCL, self).build_step()
+
+    def install_step(self):
+        """Install NCCL"""
+        self.cfg.update('installopts', "PREFIX=%s" % self.installdir)
+
+        super(EB_NCCL, self).install_step()