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NUMA topology on Linux: fix if numa-node is not in /sys/devices

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This commit is contained in:
Oliver Kowalke
2017-06-11 14:02:51 +02:00
parent 0986f9d1e6
commit cfa50268cf
1 changed files with 18 additions and 6 deletions
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24
src/numa/linux/topology.cpp
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@@ -149,6 +149,7 @@ std::vector< node > topology() {
boost::str(
boost::format("/sys/devices/system/cpu/cpu%d/") % cpu_id) };
BOOST_ASSERT( fs::exists( cpu_path) );
bool match = false;
// 2. to witch NUMA node the CPU belongs to
directory_iterator e;
for ( directory_iterator i{ cpu_path, "^node([0-9]+)$" };
@@ -159,18 +160,29 @@ std::vector< node > topology() {
// assigned to only one NUMA node
break;
}
if ( ! match) {
// no '/sys/devices/system/cpu/cpu<>/node<>'
// create NUMA node with id `0`
map[0].id = 0;
map[0].logical_cpus.insert( cpu_id);
}
}
for ( auto entry : map) {
// NUMA-node distance
fs::path distance_path{
boost::str(
boost::format("/sys/devices/system/node/node%d/distance") % entry.second.id) };
BOOST_ASSERT( fs::exists( distance_path) );
fs::ifstream fs_distance{ distance_path };
std::string content;
std::getline( fs_distance, content);
entry.second.distance = distance_from_line( content);
topo.push_back( entry.second);
if ( fs::exists( distance_path) ) {
fs::ifstream fs_distance{ distance_path };
std::string content;
std::getline( fs_distance, content);
entry.second.distance = distance_from_line( content);
topo.push_back( entry.second);
} else {
// fake NUMA distance
entry.second.distance.push_back( 10);
topo.push_back( entry.second);
}
}
return topo;
}