def runtime(self, _from='0'):
        """Generate the set of instructions to install the runtime specific
        components from a build in a previous stage.

        # Examples

        ```python
        m = mvapich2_gdr(...)
        Stage0 += m
        Stage1 += m.runtime()
        ```
        """
        self.rt += comment('MVAPICH2-GDR')
        self.rt += packages(ospackages=self.__runtime_ospackages)
        self.rt += copy(src=self.__install_path,
                        dest=self.__install_path, _from=_from)
        if self.ldconfig:
            self.rt += shell(commands=[self.ldcache_step(
                directory=posixpath.join(self.__install_path, 'lib64'))])
        # No need to workaround compiler wrapper issue for the runtime.
        self.rt += environment(
            variables=self.environment_step(exclude=['PROFILE_POSTLIB']))
        return str(self.rt)
Generate the set of instructions to install the runtime specific
        components from a build in a previous stage.

        # Examples

        ```python
        m = mvapich2_gdr(...)
        Stage0 += m
        Stage1 += m.runtime()
        ```
        
hpccm/building_blocks/mvapich2_gdr.py