higher precision for statistics values, added "sum" attribute for statistics

CHANGELOG

@@ -1,6 +1,11 @@
-v1.3.0-alpha1 (XXXX-XX-XX)
+v1.3.0-alpha2 (XXXX-XX-XX)
 --------------------------
 
+* added more precision for requests statistics figures
+
+* added "sum" attribute for individual statistics results in statistics API
+  at /_admin/statistics
+
 * made "limit" an optional parameter in AQL function NEAR().
   limit can now be either omitted completely, or set to 0. If so, an internal
   default value (currently 100) will be applied for the limit.

js/actions/api-system.js

@@ -300,12 +300,13 @@ actions.defineHttp({
 /// stored in the attribute of the same name.
 ///
 /// In case of a distribution, the returned object contains the total count in
-/// `count` and the distribution list in `counts`.
+/// `count` and the distribution list in `counts`. The sum (or total) of the
+/// individual values is returned in `sum`.
 /// 
 /// @RESTRETURNCODES
 /// 
 /// @RESTRETURNCODE{200}
-/// Statistics was returned successfully.
+/// Statistics were returned successfully.
 /// 
 /// @EXAMPLES
 /// 

lib/Statistics/figures.h

@@ -85,16 +85,17 @@ namespace triagens {
 
     struct StatisticsDistribution {
       StatisticsDistribution ()
-        : _count(0), _cuts(), _counts() {
+        : _count(0), _total(0.0), _cuts(), _counts() {
       }
 
       StatisticsDistribution (StatisticsVector const& dist)
-        : _count(0), _cuts(dist._value), _counts() {
+        : _count(0), _total(0.0), _cuts(dist._value), _counts() {
         _counts.resize(_cuts.size() + 1);
       }
 
       void addFigure (double value) {
         ++_count;
+        _total += value;
 
         std::vector<double>::iterator i = _cuts.begin();
         std::vector<uint64_t>::iterator j = _counts.begin();
@@ -110,6 +111,7 @@ namespace triagens {
       }
 
       uint64_t _count;
+      double _total;
       std::vector<double> _cuts;
       std::vector<uint64_t> _counts;
     };

lib/Statistics/statistics.cpp

@@ -418,7 +418,7 @@ double TRI_StatisticsTime () {
 #else
 
 double TRI_StatisticsTime () {
-  return (double)(time(0));
+  return TRI_microtime(); 
 }
 
 #endif

lib/V8/v8-utils.cpp

@@ -261,6 +261,7 @@ static void FillDistribution (v8::Handle<v8::Object> list,
                               StatisticsDistribution const& dist) {
   v8::Handle<v8::Object> result = v8::Object::New();
 
+  result->Set(TRI_V8_SYMBOL("sum"), v8::Number::New(dist._total));
   result->Set(TRI_V8_SYMBOL("count"), v8::Number::New(dist._count));
 
   v8::Handle<v8::Array> counts = v8::Array::New(dist._counts.size());