Change memory consumption in monitor example

In the monitor example the application simulates an increasing memory
consumption, rather based on a bug in the JavaScript engine, which
lead to other side effects. The new version should be more reliable.
Also provided some hints for single-process mode and when no app
windows are available.

Task-number: QTAUTO-786
Change-Id: I5a055d775d5705487dc6fcdc1a81889f7dd14e07
Reviewed-by: Dominik Holland <dominik.holland@pelagicore.com>

2 files changed, 29 insertions, 14 deletions

diff --git a/examples/monitor/apps/tld.monitor.app/app.qml b/examples/monitor/apps/tld.monitor.app/app.qml
index 0318e34f..e8c57e0a 100644
--- a/examples/monitor/apps/tld.monitor.app/app.qml
+++ b/examples/monitor/apps/tld.monitor.app/app.qml
@@ -69,12 +69,11 @@ ApplicationWindow {
         running: true
         repeat: true
         onTriggered: {
-            if (count < 500) {
+            if (count < 100) {
                 var arr = [];
-                var busy = Math.random() * 5000;
-                while (busy > 0)
-                    arr[busy] = busy--;
-                interval = 20 + Math.random() * 80;
+                var idx = 200000;
+                while (idx > 0)
+                    arr[idx] = idx--;
                 count++;
             } else {
                 repeat = false;
diff --git a/examples/monitor/system-ui/main.qml b/examples/monitor/system-ui/main.qml
index 2d7e6e8e..a3ddb658 100644
--- a/examples/monitor/system-ui/main.qml
+++ b/examples/monitor/system-ui/main.qml
@@ -60,7 +60,6 @@ Window {
 
     property var primaryWindow
     property var secondaryWindow
-    property var monitoredAppWindow
 
     width: 720
     height: 600
@@ -122,14 +121,29 @@ Window {
                 spacing: 20
 
                 MonitorText {
-                    text: "Process: " + (processMon.applicationId === "" ? "System-UI" : processMon.applicationId)
+                    text: processMon.applicationId === "" ? "System-UI" : processMon.applicationId
                     font.pixelSize: 26
                 }
                 MonitorText { text: "Process ID: " + processMon.processId }
 
                 Switch {
-                    onToggle: processMon.applicationId = processMon.applicationId === ""
+                    onToggle: {
+                        processMon.applicationId = processMon.applicationId === ""
                                                          ? ApplicationManager.application(0).id : ""
+                        if (processMon.applicationId !== "") {
+                            if (ApplicationManager.singleProcess)
+                                console.warn("There is no dedicated application process in single-process mode");
+
+                            if (primaryWindow && secondaryWindow) {
+                                processMon.monitoredWindows = primary.active ? [primaryWindow] : [secondaryWindow]
+                            } else {
+                                processMon.monitoredWindows = []
+                                console.warn("No application window available. Please check your QtWayland configuration.");
+                            }
+                        } else {
+                            processMon.monitoredWindows = [root]
+                        }
+                    }
                 }
             }
         }
@@ -147,7 +161,7 @@ Window {
                     id: primary
                     active: true
                     onActivated: {
-                        root.monitoredAppWindow = [primaryWindow];
+                        processMon.monitoredWindows = [primaryWindow];
                         secondary.active = false;
                     }
                 }
@@ -155,7 +169,7 @@ Window {
                 WindowContainer {
                     id: secondary
                     onActivated: {
-                        root.monitoredAppWindow = [secondaryWindow];
+                        processMon.monitoredWindows = [secondaryWindow];
                         primary.active = false;
                     }
                 }
@@ -201,7 +215,6 @@ Window {
                 primaryWindow = window
                 window.parent = primary.container
                 window.anchors.fill = primary.container
-                root.monitoredAppWindow = [primaryWindow];
             } else {
                 secondaryWindow = window
                 window.parent = secondary.container
@@ -210,7 +223,7 @@ Window {
         }
 
         onWindowLost: {
-            root.monitoredAppWindow = []
+            processMon.monitoredWindows = []
             WindowManager.releaseWindow(window);
         }
     }
@@ -223,10 +236,13 @@ Window {
 
         memoryReportingEnabled: true
         frameRateReportingEnabled: true
-        monitoredWindows: (applicationId === "" || ApplicationManager.singleProcess) ? [ root ] : root.monitoredAppWindow
+        monitoredWindows: [root]
 
         onMemoryReportingChanged: processPss.reading = (memoryPss.total / 1e6).toFixed(0) + " MB";
-        onFrameRateReportingChanged: frameChart.reading = frameRate[0].average.toFixed(0) + " fps";
+        onFrameRateReportingChanged: {
+            if (frameRate[0])
+                frameChart.reading = frameRate[0].average.toFixed(0) + " fps";
+        }
     }
 
     Connections {