performance_tests: better stats, and keep track of timing history

1 files changed, 34 insertions, 0 deletions

diff --git a/src/common/timings.h b/src/common/timings.h
new file mode 100644
index 000000000..fb905611f
--- /dev/null
+++ b/src/common/timings.h
@@ -0,0 +1,34 @@
+#pragma once
+
+#include <stdint.h>
+#include <string>
+#include <vector>
+#include <map>
+
+class TimingsDatabase
+{
+public:
+  struct instance
+  {
+    time_t t;
+    size_t npoints;
+    double min, max, mean, median, stddev, npskew;
+    std::vector<uint64_t> deciles;
+  };
+
+public:
+  TimingsDatabase();
+  TimingsDatabase(const std::string &filename);
+  ~TimingsDatabase();
+
+  std::vector<instance> get(const char *name) const;
+  void add(const char *name, const instance &data);
+
+private:
+  bool load();
+  bool save();
+
+private:
+  std::string filename;
+  std::multimap<std::string, instance> instances;
+};