如何提升Node执行效率
Node.js基予Google V8引擎，性能优秀，但JavaScript毕竟是脚本语言，和C/C++相比还是有差距的，本文通过计算fibnacci数列来对比Node Addon和JavaScript之间的性能差距，对性能有要求可以作为参考。
1 // addon.cc 2 #include <node.h> 3 4 namespace demo { 5 6 using v8::Exception; 7 using v8::FunctionCallbackInfo; 8 using v8::Isolate; 9 using v8::Local; 10 using v8::Number; 11 using v8::Object; 12 using v8::String; 13 using v8::Value; 14 15 int fib(int v) 16 { 17 if (v == 0) return 0; 18 else if (v == 1) return 1; 19 else return fib(v - 1) + fib(v - 2); 20 } 21 22 void Calc(const FunctionCallbackInfo<Value>& args) { 23 Isolate* isolate = args.GetIsolate(); 24 25 if (args.Length() < 1) { 26 // Throw an Error that is passed back to JavaScript 27 isolate->ThrowException(Exception::TypeError( 28 String::NewFromUtf8(isolate, "Wrong number of arguments"))); 29 return; 30 } 31 32 // Check the argument types 33 if (!args[0]->IsNumber()) { 34 isolate->ThrowException(Exception::TypeError( 35 String::NewFromUtf8(isolate, "Wrong arguments"))); 36 return; 37 } 38 39 // Perform the operation 40 int value = (int)args[0]->NumberValue(); 41 42 int f = fib(value); 43 44 Local<Number> num = Number::New(isolate, f); 45 46 args.GetReturnValue().Set(num); 47 } 48 49 void Init(Local<Object> exports) { 50 NODE_SET_METHOD(exports, "fib", Calc); 51 } 52 53 NODE_MODULE(addon, Init) 54 55 } // namespace demo
1 // hello.js 2 const addon = require('./build/Release/addon'); 3 4 // C++ 计算 5 console.log(new Date().toLocaleString()); 6 console.log('The C++ result is: ', addon.fib(45)); 7 console.log(new Date().toLocaleString()); 8 9 10 // JavaScript 计算 11 function fib(v) { 12 if (v == 0) return 0; 13 else if (v == 1) return 1; 14 else return fib(v - 1) + fib(v - 2); 15 } 16 17 console.log('The js result is: ', fib(45)); 18 console.log(new Date().toLocaleString());
结果很明显-------------------------------
