gperf

chronolaw · chronolaw · commit caf5c13fabbe · 2020-03-20T15:51:56.000+08:00
diff --git a/README.md b/README.md
@@ -53,6 +53,7 @@ Pull requests of make/cmake are welcome!
 * [luajit-openresty](https://github.com/openresty/luajit2)
 * [LuaBridge](https://github.com/vinniefalco/LuaBridge)
 * [gperftools](https://github.com/gperftools/gperftools)
+* [FlameGraph](https://github.com/brendangregg/FlameGraph)
 
 
 * [Awesome C++](https://github.com/fffaraz/awesome-cpp)
diff --git a/section4/gperf.cpp b/section4/gperf.cpp
@@ -1,17 +1,64 @@
 // Copyright (c) 2020 by Chrono
 //
-// g++ gperf.cpp -std=c++11 -lprofiler -ltcmalloc -o a.out;./a.out
-// g++ gperf.cpp -std=c++14 -lprofiler -ltcmalloc -o a.out;./a.out
+// g++ gperf.cpp -std=c++14 -lprofiler -ltcmalloc -g -O0 -o a.out;./a.out
+
+#include <cassert>
 
 #include <iostream>
+#include <memory>
+#include <string>
+#include <regex>
 
 #include <gperftools/profiler.h>
 #include <gperftools/heap-profiler.h>
 
 using namespace std;
 
+auto make_cpu_profiler =
+[](const string& filename)
+{
+    ProfilerStart(filename.c_str());
+    ProfilerRegisterThread();
+
+    return std::shared_ptr<void>(
+        nullptr,
+        [](void*){
+            ProfilerStop();
+        }
+    );
+};
+
+static
+auto make_regex = [](const auto& txt)
+{
+    return std::regex(txt);
+};
+
+static
+auto make_match = []()
+{
+    return std::smatch();
+};
+
+void case1()
+{
+    auto p = make_cpu_profiler("case1.perf");
+
+    auto str = "neir:automata"s;
+
+    for(int i = 0; i < 1000; i++) {
+
+        auto reg  = make_regex(R"(^(\w+)\:(\w+)$)");
+        auto what = make_match();
+
+        assert(regex_match(str, what, reg));
+    }
+}
+
 
 int main()
 {
+    case1();
+
     cout << "gperf demo" << endl;
 }
