go(plot): track plotting execution time

algo/plot.go

@@ -6,6 +6,7 @@ package algo
 import (
 	"fmt"
 	"log"
+	"time"
 
 	"git.dotya.ml/wanderer/math-optim/stats"
 	"gonum.org/v1/gonum/floats"
@@ -20,6 +21,7 @@ const preferredFontStyle = "Mono"
 // violating the limit of 30, TODO(me): split this up.
 // nolint: gocognit
 func plotAllDims(algoStats []stats.Stats, fPrefix, fExt string) {
+	start := time.Now()
 	pWidth := 13 * vg.Centimeter
 	pHeight := 13 * vg.Centimeter
 
@@ -95,7 +97,9 @@ func plotAllDims(algoStats []stats.Stats, fPrefix, fExt string) {
 				fmt.Sprint(len(dim.Solution)) + "I" +
 				fExt
 
-			info := "saving img to file: " + filename
+			elapsed := time.Since(start)
+			info := "saving img to file: " + filename +
+				" [generated in " + fmt.Sprint(elapsed) + "]"
 
 			if s.Algo == "Random Search" {
 				printRandomSearch(info)