Added command line option --export-topology.

src/base/kernel/Entry.cpp

@@ -41,6 +41,9 @@
 #include "version.h"
 
 
+namespace xmrig {
+
+
 static int showVersion()
 {
     printf(APP_NAME " " APP_VERSION "\n built on " __DATE__
@@ -92,6 +95,36 @@ static int showVersion()
 }
 
 
+#ifdef XMRIG_FEATURE_HWLOC
+static int exportTopology(const Process &process)
+{
+    const String path = process.location(Process::ExeLocation, "topology.xml");
+
+    hwloc_topology_t topology;
+    hwloc_topology_init(&topology);
+    hwloc_topology_load(topology);
+
+#   if HWLOC_API_VERSION >= 0x20000
+    if (hwloc_topology_export_xml(topology, path, 0) == -1) {
+#   else
+    if (hwloc_topology_export_xml(topology, path) == -1) {
+#   endif
+        printf("failed to export hwloc topology.\n");
+    }
+    else {
+        printf("hwloc topology successfully exported to \"%s\"\n", path.data());
+    }
+
+    hwloc_topology_destroy(topology);
+
+    return 0;
+}
+#endif
+
+
+} // namespace xmrig
+
+
 xmrig::Entry::Id xmrig::Entry::get(const Process &process)
 {
     const Arguments &args = process.arguments();
@@ -103,11 +136,17 @@ xmrig::Entry::Id xmrig::Entry::get(const Process &process)
          return Version;
     }
 
+#   ifdef XMRIG_FEATURE_HWLOC
+    if (args.hasArg("--export-topology")) {
+        return Topo;
+    }
+#   endif
+
     return Default;
 }
 
 
-int xmrig::Entry::exec(const Process &, Id id)
+int xmrig::Entry::exec(const Process &process, Id id)
 {
     switch (id) {
     case Usage:
@@ -117,6 +156,11 @@ int xmrig::Entry::exec(const Process &, Id id)
     case Version:
         return showVersion();
 
+#   ifdef XMRIG_FEATURE_HWLOC
+    case Topo:
+        return exportTopology(process);
+#   endif
+
     default:
         break;
     }

src/base/kernel/Entry.h

@@ -38,7 +38,8 @@ public:
     enum Id {
         Default,
         Usage,
-        Version
+        Version,
+        Topo
     };
 
     static Id get(const Process &process);

src/core/config/usage.h

@@ -113,6 +113,10 @@ Options:\n\
       --randomx-init=N          threads count to initialize RandomX dataset\n\
       --randomx-no-numa         disable NUMA support for RandomX\n"
 #endif
+#ifdef XMRIG_FEATURE_HWLOC
+"\
+      --export-topology         export hwloc topology to a XML file and exit\n"
+#endif
 "\
       --dry-run                 test configuration and exit\n\
   -h, --help                    display this help and exit\n\