Controller optimizations -- make locking more fine-grained, use true hardware concurrency, etc.

selftest.cpp

@@ -25,6 +25,7 @@
 #include <iostream>
 #include <string>
 #include <vector>
+#include <thread>
 
 #include "node/Constants.hpp"
 #include "node/Hashtable.hpp"
@@ -1114,6 +1115,7 @@ int main(int argc,char **argv)
 	*/
 
 	std::cout << "[info] sizeof(void *) == " << sizeof(void *) << std::endl;
+	std::cout << "[info] hardware concurrency == " << std::thread::hardware_concurrency() << std::endl;
 	std::cout << "[info] sizeof(NetworkConfig) == " << sizeof(ZeroTier::NetworkConfig) << std::endl;
 
 	srand((unsigned int)time(0));