před 6 roky · b304147caa
--- a/src/examples/perf.js
+++ b/src/examples/perf.js
@@ -80,7 +80,7 @@ const flags = `
 const wasm_code = '';

 export const example = {
    title: 'JS vs Compiled JS perf',
    title: 'JS vs Compiled JS perf (simple loop)',
    cpp_code: cpp_code,
    js_code: js_code,
    wasm_code: wasm_code,
--- a/src/examples/perf2.js
+++ b/src/examples/perf2.js
@@ -0,0 +1,96 @@
 const cpp_code = `
 #include <vector>
 #include <algorithm>
 #include <cheerp/client.h>
 #include <cheerp/clientlib.h>

 class [[cheerp::jsexport]] JsBridge
 {
 public:
    JsBridge() = default;
 	
 	void sort(client::Float64Array* ar)
 	{
        // copy all the numbers
 		std::vector<double> test;
 		test.reserve(ar->get_length());

 	    for(size_t i=0;i<ar->get_length();i++) {
            test.push_back((*ar)[i]);
 		}

        // sort them
 	    std::sort(std::begin(test), std::end(test), std::less<double>()) ;

        // copy them back
 	    for(size_t i=0;i<ar->get_length();i++) {
            (*ar)[i] = test[i];
 		}
 	}
 };
 void webMain() {
 }
 `.trim();

 const html_code = `
 <html>
  <head>
    <script>
      function benchmark(func) {
        var start = new Date().getTime();
        func();
        var time = new Date().getTime() - start;
        return time;
      }

      // Please note that running this might take a while! (but I expect < 30s on an average PC)
      for (var n = 10; n <= 10000000; n *= 10) {
        document.write("<strong>Test for N=",n,"</strong><BR>");
              
        var some_array = [], some_array2 = []; 
        var time = benchmark(function () {
          for (var i = 0; i < n; ++i) {
            var num = Math.random();
            some_array.push(num);
            some_array2.push(num);
          }
        });
        document.write("Initialized arrays: ",some_array.slice(0, 1), ", took: ",(time/1000.0)," secs<BR>");

        // "C++"
        var jsBridge = new JsBridge();
        time = benchmark(_ => 
          jsBridge.sort(some_array2)
        );
        document.write("C++: ",some_array2.slice(0, 1), ", took: ",(time/1000.0)," secs<BR>");
        
        // JS
        time = benchmark(_ =>
          some_array.sort((a, b) => a - b) // lambda required for sorting numerically instead of alphabetically
        );
        document.write("JS: ",some_array.slice(0, 1), ", took: ",(time/1000.0)," secs<BR><BR>");
      }
    </script>
  </head>
  <body>
  </body>
 </html>
 `.trim();

 const js_code = ``.trim();

 const flags = `
 -cheerp-pretty-code
 -O3
 -target cheerp`.trim()

 const wasm_code = '';

 export const example = {
    title: 'JS vs Compiled JS perf (sorting)',
    cpp_code: cpp_code,
    js_code: js_code,
    wasm_code: wasm_code,
    html_code: html_code,
    flags: flags
 }