Improve scale() performance

src/datasource-zabbix/benchmarks/timeseries_bench.js

@@ -45,6 +45,17 @@ module.exports = [
       }
     }
   },
+  {
+    name: 'scale',
+    tests: {
+      'scale()': () => {
+        ts.scale(datapoints, 42);
+      },
+      'scale_perf()': () => {
+        ts.scale_perf(datapoints, 42);
+      }
+    }
+  },
   {
     name: 'groupBy vs groupBy_perf',
     tests: {

src/datasource-zabbix/dataProcessor.js

@@ -8,7 +8,7 @@ let groupBy_exported = (interval, groupFunc, datapoints) => groupBy(datapoints,
 let sumSeries = ts.sumSeries;
 let delta = ts.delta;
 let rate = ts.rate;
-let scale = (factor, datapoints) => ts.scale(datapoints, factor);
+let scale = (factor, datapoints) => ts.scale_perf(datapoints, factor);
 
 let SUM = ts.SUM;
 let COUNT = ts.COUNT;

src/datasource-zabbix/timeseries.js

@@ -169,6 +169,17 @@ function scale(datapoints, factor) {
   });
 }
 
+function scale_perf(datapoints, factor) {
+  for (let i = 0; i < datapoints.length; i++) {
+    datapoints[i] = [
+      datapoints[i][POINT_VALUE] * factor,
+      datapoints[i][POINT_TIMESTAMP]
+    ];
+  }
+
+  return datapoints;
+}
+
 /**
  * Simple delta. Calculate value delta between points.
  * @param {*} datapoints
@@ -327,6 +338,7 @@ const exportedFunctions = {
   groupBy_perf,
   sumSeries,
   scale,
+  scale_perf,
   delta,
   rate,
   SUM,