fallback_env 2963 opal/mca/hwloc/hwloc201/hwloc/hwloc/topology-linux.c char * fallback_env = getenv("HWLOC_KNL_HDH_FALLBACK"); fallback_env 2964 opal/mca/hwloc/hwloc201/hwloc/hwloc/topology-linux.c int fallback = fallback_env ? atoi(fallback_env) : -1; /* by default, only fallback if needed */