added width, height and output filename options

cmd/memplot.go

@@ -23,8 +23,6 @@ func main() {
 		PlotVsz: false,
 	}
 
-	pidPtr := flag.Int("pid", -1, "pid of the process to analyze")
-
 	// Default sample duration time
 	defaultSd, err := time.ParseDuration("5ms")
 	check(err)
@@ -33,15 +31,28 @@ func main() {
 	defaultDur, err := time.ParseDuration("10s")
 	check(err)
 
+	defaultFilename := "output-plot.png"
+	pidPtr := flag.Int("pid", -1, "pid of the process to analyze")
+	filenamePtr := flag.String("o", defaultFilename, "output image file name")
 	sdPtr := flag.Duration("sd", defaultSd, "sample size in time")
 	durPtr := flag.Duration("dur", defaultDur, "total profiling time")
 
+	// To plot or not VSZ
 	flag.BoolVar(&opts.PlotVsz, "vsz", false, "plot virtual size")
 
+	widthStr := flag.String("w", "16cm", "plot image width (can be cm or in)")
+	heightStr := flag.String("h", "12cm", "plot image height (can be cm or in)")
+
 	flag.Parse()
+
+	// Checks for valid flags
 	if *pidPtr <= 0 {
 		panic(errors.New("Invalid PID. Please specify a PID using -pid flag"))
 	}
+	widthImage, err := vg.ParseLength(*widthStr)
+	check(err)
+	heightImage, err := vg.ParseLength(*heightStr)
+	check(err)
 
 	// Create and sample
 	fmt.Fprintln(os.Stderr, "Analyzing PID", *pidPtr, "...")
@@ -53,6 +64,6 @@ func main() {
 	check(err)
 
 	fmt.Fprintln(os.Stderr, "Saving plot..")
-	memplot.SavePlot(plot, 8*vg.Inch, 8*vg.Inch, "plot.png")
+	memplot.SavePlot(plot, widthImage, heightImage, *filenamePtr)
 
 }

memplot.go

@@ -122,6 +122,7 @@ func (m *MemoryCollection) Plot(opt PlotOptions) (*plot.Plot, error) {
 		p.Legend.Add("RSS", rssLine)
 	}
 
+	// TODO add another Y axis for vsz
 	if opt.PlotVsz {
 		// RSS line plotter and style
 		vszData := m.GatherVSZXYs()