Use single array as content for all VeryFastByteString nodes to save memory

README.md

@@ -233,6 +233,7 @@ More information about this feature can be found [here](deterministic-alarms.md)
 - Nodes with 1 kB (ByteString) values: `--vf1k`. The first byte cycles from 0 to 255 in a configurable rate in ms: `--vf1kr`. The values are deterministic but scrambled to ensure that they are not efficiently compressed.
 - Load binary *.PredefinedNodes.uanodes file(s) compiled from an XML NodeSet: `--unf=<PredefinedNodes_uanodes>`
 - Load *.NodeSet2.xml file(s): `--ns2=<NodeSet2_xml>`
+- Node that shows working set memory consumption in MB: Root/Objects/OpcPlc/Telemetry/Special/WorkingSetMB
 
 ## OPC UA Methods
 | Name                 | Description                                    | Prerequisite                                   |

src/AlarmCondition/AlarmConditionNodeManager.cs

@@ -29,7 +29,6 @@
 
 using System;
 using System.Collections.Generic;
-using System.Reflection.Emit;
 using System.Threading;
 using Opc.Ua;
 using Opc.Ua.Server;

src/PlcNodeManager.cs

@@ -33,13 +33,11 @@ public PlcNodeManager(IServerInternal server, OpcPlcConfiguration config, Applic
     /// </summary>
     public override NodeId New(ISystemContext context, NodeState node)
     {
-        if (node is BaseInstanceState instance && instance.Parent != null &&
-            instance.Parent.NodeId.Identifier is string id)
-        {
-            return new NodeId(id + "_" + instance.SymbolicName, instance.Parent.NodeId.NamespaceIndex);
-        }
-
-        return node.NodeId;
+        return node is BaseInstanceState instance &&
+               instance.Parent != null &&
+               instance.Parent.NodeId.Identifier is string id
+                  ? new NodeId(id + "_" + instance.SymbolicName, instance.Parent.NodeId.NamespaceIndex)
+                  : node.NodeId;
     }
 
     /// <summary>
@@ -105,7 +103,7 @@ public FolderState CreateFolder(NodeState parent, string path, string name, Name
 
         ushort namespaceIndex = NamespaceIndexes[(int)namespaceType];
 
-        var folder = new FolderState(parent)
+        var folder = new FolderState(parent)
         {
             SymbolicName = name,
             ReferenceTypeId = ReferenceTypes.Organizes,

src/PlcServer.cs

@@ -46,9 +46,9 @@ public partial class PlcServer : StandardServer
     private uint _countCreateSession;
     private uint _countCreateSubscription;
     private uint _countCreateMonitoredItems;
-    private uint _countPublish;
     private uint _countRead;
     private uint _countWrite;
+    private uint _countPublish;
 
     public PlcServer(OpcPlcConfiguration config, PlcSimulation plcSimulation, TimeService timeService, ImmutableList<IPluginNodes> pluginNodes, ILogger logger)
     {
@@ -64,37 +64,38 @@ public PlcServer(OpcPlcConfiguration config, PlcSimulation plcSimulation, TimeSe
                 {
                     var curProc = Process.GetCurrentProcess();
 
-                    ThreadPool.GetAvailableThreads(out int availWorkerThreads, out int availCompletionPortThreads);
+                    ThreadPool.GetAvailableThreads(out int availWorkerThreads, out _);
 
-                    int sessionCount = ServerInternal.SessionManager.GetSessions().Count;
+                    uint sessionCount = ServerInternal.ServerDiagnostics.CurrentSessionCount;
                     IList<Subscription> subscriptions = ServerInternal.SubscriptionManager.GetSubscriptions();
                     int monitoredItemsCount = subscriptions.Sum(s => s.MonitoredItemCount);
 
                     _autoDisablePublishMetrics = sessionCount > 40 || monitoredItemsCount > 500;
 
                     LogPeriodicInfo(
                         sessionCount,
-                        subscriptions.Count,
+                        ServerInternal.ServerDiagnostics.CurrentSubscriptionCount,
                         monitoredItemsCount,
+                        ServerInternal.ServerDiagnostics.CumulatedSessionCount,
+                        ServerInternal.ServerDiagnostics.CumulatedSubscriptionCount,
                         curProc.WorkingSet64 / 1024 / 1024,
                         availWorkerThreads,
-                        availCompletionPortThreads,
                         curProc.Threads.Count,
                         PeriodicLoggingTimerSeconds,
                         _countCreateSession,
                         _countCreateSubscription,
                         _countCreateMonitoredItems,
-                        _countPublish,
                         _countRead,
                         _countWrite,
+                        _countPublish,
                         PublishMetricsEnabled);
 
                     _countCreateSession = 0;
                     _countCreateSubscription = 0;
                     _countCreateMonitoredItems = 0;
-                    _countPublish = 0;
                     _countRead = 0;
                     _countWrite = 0;
+                    _countPublish = 0;
                 }
                 catch
                 {
@@ -178,15 +179,14 @@ public override ResponseHeader CreateSubscription(
 
         try
         {
-            OperationContext context = ValidateRequest(requestHeader, RequestType.CreateSubscription);
-
             var responseHeader = base.CreateSubscription(requestHeader, requestedPublishingInterval, requestedLifetimeCount, requestedMaxKeepAliveCount, maxNotificationsPerPublish, publishingEnabled, priority, out subscriptionId, out revisedPublishingInterval, out revisedLifetimeCount, out revisedMaxKeepAliveCount);
 
-            MetricsHelper.AddSubscriptionCount(context.SessionId.ToString(), subscriptionId.ToString());
+            NodeId sessionId = GetSessionId(requestHeader.AuthenticationToken);
+            MetricsHelper.AddSubscriptionCount(sessionId.ToString(), subscriptionId.ToString());
 
             LogSuccessWithSessionIdAndSubscriptionId(
                 nameof(CreateSubscription),
-                context.SessionId,
+                sessionId,
                 subscriptionId);
 
             return responseHeader;
@@ -215,17 +215,18 @@ public override ResponseHeader CreateMonitoredItems(
 
         try
         {
-            OperationContext context = ValidateRequest(requestHeader, RequestType.CreateMonitoredItems);
-
             var responseHeader = base.CreateMonitoredItems(requestHeader, subscriptionId, timestampsToReturn, itemsToCreate, out results, out diagnosticInfos);
 
             MetricsHelper.AddMonitoredItemCount(itemsToCreate.Count);
 
-            LogSuccessWithSessionIdAndSubscriptionIdAndCount(
-                nameof(CreateMonitoredItems),
-                context.SessionId,
-                subscriptionId,
-                itemsToCreate.Count);
+            if(_logger.IsEnabled(LogLevel.Debug))
+            {
+                LogSuccessWithSessionIdAndSubscriptionIdAndCount(
+                    nameof(CreateMonitoredItems),
+                    GetSessionId(requestHeader.AuthenticationToken),
+                    subscriptionId,
+                    itemsToCreate.Count);
+            }
 
             return responseHeader;
         }
@@ -259,19 +260,20 @@ public override ResponseHeader Publish(
 
         try
         {
-            OperationContext context = ValidateRequest(requestHeader, RequestType.Publish);
-
             var responseHeader = base.Publish(requestHeader, subscriptionAcknowledgements, out subscriptionId, out availableSequenceNumbers, out moreNotifications, out notificationMessage, out results, out diagnosticInfos);
 
             if (PublishMetricsEnabled)
             {
                 AddPublishMetrics(notificationMessage);
             }
 
-            LogSuccessWithSessionIdAndSubscriptionId(
-                nameof(Publish),
-                context.SessionId,
-                subscriptionId);
+            if (_logger.IsEnabled(LogLevel.Debug))
+            {
+                LogSuccessWithSessionIdAndSubscriptionId(
+                    nameof(Publish),
+                    GetSessionId(requestHeader.AuthenticationToken),
+                    subscriptionId);
+            }
 
             return responseHeader;
         }
@@ -599,38 +601,39 @@ private void AddPublishMetrics(NotificationMessage notificationMessage)
         MetricsHelper.AddPublishedCount(dataChanges, events);
     }
 
+    private NodeId GetSessionId(NodeId authenticationToken) => ServerInternal.SessionManager.GetSession(authenticationToken).Id;
+
     [LoggerMessage(
         Level = LogLevel.Information,
-        Message = "\n\t# Open sessions: {Sessions}\n" +
-                  "\t# Open subscriptions: {Subscriptions}\n" +
+        Message = "\n\t# Open/total sessions: {Sessions}/{TotalSessions}\n" +
+                  "\t# Open/total subscriptions: {Subscriptions}/{TotalSubscriptions}\n" +
                   "\t# Monitored items: {MonitoredItems:N0}\n" +
                   "\t# Working set: {WorkingSet:N0} MB\n" +
-                  "\t# Available worker threads: {AvailWorkerThreads:N0}\n" +
-                  "\t# Available completion port threads: {AvailCompletionPortThreads:N0}\n" +
-                  "\t# Thread count: {ThreadCount:N0}\n" +
-                  "\t# Statistics for the last {PeriodicLoggingTimerSeconds} s\n" +
+                  "\t# Used/available worker threads: {ThreadCount:N0}/{AvailWorkerThreads:N0}\n" +
+                  "\t# Stats for the last {PeriodicLoggingTimerSeconds} s\n" +
                   "\t# Sessions created: {CountCreateSession}\n" +
                   "\t# Subscriptions created: {CountCreateSubscription}\n" +
                   "\t# Monitored items created: {CountCreateMonitoredItems}\n" +
-                  "\t# Publish requests: {CountPublish}\n" +
                   "\t# Read requests: {CountRead}\n" +
                   "\t# Write requests: {CountWrite}\n" +
+                  "\t# Publish requests: {CountPublish}\n" +
                   "\t# Publish metrics enabled: {PublishMetricsEnabled:N0}")]
     partial void LogPeriodicInfo(
-        int sessions,
-        int subscriptions,
+        uint sessions,
+        uint subscriptions,
         int monitoredItems,
+        uint totalSessions,
+        uint totalSubscriptions,
         long workingSet,
         int availWorkerThreads,
-        int availCompletionPortThreads,
         int threadCount,
         int periodicLoggingTimerSeconds,
         uint countCreateSession,
         uint countCreateSubscription,
         uint countCreateMonitoredItems,
-        uint countPublish,
         uint countRead,
         uint countWrite,
+        uint countPublish,
         bool publishMetricsEnabled);
 
     [LoggerMessage(

src/PluginNodes/VeryFast1KBPluginNodes.cs

@@ -59,7 +59,7 @@ public void StartSimulation()
         // Only use the fast timers when we need to go really fast,
         // since they consume more resources and create an own thread.
         _nodeGenerator = NodeRate >= 50 || !Stopwatch.IsHighResolution
-            ? _timeService.NewTimer((s, e) => UpdateNodes(), NodeRate)
+            ? _timeService.NewTimer((s, e) => UpdateNodes(), intervalInMilliseconds: NodeRate)
             : _timeService.NewFastTimer((s, e) => UpdateNodes(), intervalInMilliseconds: NodeRate);
     }
 

src/PluginNodes/VeryFastByteStringPluginNodes.cs

@@ -22,6 +22,7 @@ public class VeryFastByteStringPluginNodes(TimeService timeService, ILogger logg
     private readonly DeterministicGuid _deterministicGuid = new();
     private PlcNodeManager _plcNodeManager;
     private BaseDataVariableState[] _veryFastByteStringNodes;
+    private byte[] _byteString;
     private ITimer _nodeGenerator;
 
     public void AddOptions(Mono.Options.OptionSet optionSet)
@@ -65,7 +66,7 @@ public void StartSimulation()
         // Only use the fast timers when we need to go really fast,
         // since they consume more resources and create an own thread.
         _nodeGenerator = NodeRate >= 50 || !Stopwatch.IsHighResolution
-            ? _timeService.NewTimer((s, e) => UpdateNodes(), NodeRate)
+            ? _timeService.NewTimer((s, e) => UpdateNodes(), intervalInMilliseconds: NodeRate)
             : _timeService.NewFastTimer((s, e) => UpdateNodes(), intervalInMilliseconds: NodeRate);
     }
 
@@ -75,22 +76,23 @@ public void StopSimulation()
         {
             _nodeGenerator.Enabled = false;
         }
-    }
-
-    private void AddNodes(FolderState folder)
+    }
+
+    private void AddNodes(FolderState folder)
     {
-        var nodes = new List<NodeWithIntervals>();
+        var nodes = new List<NodeWithIntervals>();
         _veryFastByteStringNodes = new BaseDataVariableState[NodeCount];
 
+        // Use min. node size of 1 byte.
         int nodeSize = NodeSize < 1
             ? 1
             : (int)NodeSize;
-
+
+        string nodeSizeGuid = GetLongDeterministicGuid(nodeSize);
+        _byteString = Encoding.UTF8.GetBytes(nodeSizeGuid);
+
         for (int i = 0; i < NodeCount; i++)
         {
-            string nodeSizeGuid = GetLongDeterministicGuid(nodeSize);
-            var initialByteArray = Encoding.UTF8.GetBytes(nodeSizeGuid);
-
             string name = $"VeryFastByteString{(i + 1)}";
 
             _veryFastByteStringNodes[i] = _plcNodeManager.CreateBaseVariable(
@@ -102,7 +104,7 @@ private void AddNodes(FolderState folder)
                 AccessLevels.CurrentReadOrWrite,
                 "Very fast changing ByteString node",
                 NamespaceType.OpcPlcApplications,
-                initialByteArray);
+                _byteString);
 
             // Update pn.json output.
             nodes.Add(new NodeWithIntervals {
@@ -113,26 +115,23 @@ private void AddNodes(FolderState folder)
 
             Nodes = nodes;
         }
-    }
-
+    }
+
     private void UpdateNodes()
     {
+        // Update first byte in the range 0 to 255.
+        _byteString[0] = _byteString[0] == 255
+            ? (byte)0
+            : (byte)(_byteString[0] + 1);
+
         for (int i = 0; i < _veryFastByteStringNodes.Length; i++)
         {
-            byte[] arrayValue = (byte[])_veryFastByteStringNodes[i].Value;
-
-            // Update first byte in the range 0 to 255.
-            arrayValue[0] = arrayValue[0] == 255
-                ? (byte)0
-                : (byte)(arrayValue[0] + 1);
-
-            SetValue(_veryFastByteStringNodes[i], arrayValue);
+            UpdateValue(_veryFastByteStringNodes[i]);
         }
     }
 
-    private void SetValue<T>(BaseVariableState variable, T value)
+    private void UpdateValue(BaseVariableState variable)
     {
-        variable.Value = value;
         variable.Timestamp = _timeService.Now();
         variable.ClearChangeMasks(_plcNodeManager.SystemContext, includeChildren: false);
     }

src/PluginNodes/WorkingSetPluginNode.cs

@@ -0,0 +1,68 @@
+namespace OpcPlc.PluginNodes;
+
+using Microsoft.Extensions.Logging;
+using Opc.Ua;
+using OpcPlc.Helpers;
+using OpcPlc.PluginNodes.Models;
+using System.Diagnostics;
+
+/// <summary>
+/// Node that shows current working set memory consumption in MB.
+/// </summary>
+public class WorkingSetPluginNode(TimeService timeService, ILogger logger) : PluginNodeBase(timeService, logger), IPluginNodes
+{
+    private PlcNodeManager _plcNodeManager;
+    private SimulatedVariableNode<uint> _node;
+
+    public void AddOptions(Mono.Options.OptionSet optionSet)
+    {
+        // Enabled by default.
+    }
+
+    public void AddToAddressSpace(FolderState telemetryFolder, FolderState methodsFolder, PlcNodeManager plcNodeManager)
+    {
+        _plcNodeManager = plcNodeManager;
+
+        FolderState folder = _plcNodeManager.CreateFolder(
+            telemetryFolder,
+            path: "Special",
+            name: "Special",
+            NamespaceType.OpcPlcApplications);
+
+        AddNodes(folder);
+    }
+
+    public void StartSimulation()
+    {
+        _node.Start(value => GetWorkingSetMB(), periodMs: 1000);
+    }
+
+    public void StopSimulation()
+    {
+        _node.Stop();
+    }
+
+    private void AddNodes(FolderState folder)
+    {
+        BaseDataVariableState variable = _plcNodeManager.CreateBaseVariable(
+            folder,
+            path: "WorkingSetMB",
+            name: "WorkingSetMB",
+            new NodeId((uint)BuiltInType.UInt32),
+            ValueRanks.Scalar,
+            AccessLevels.CurrentReadOrWrite,
+            "Working set memory consumption in MB",
+            NamespaceType.OpcPlcApplications,
+            defaultValue: GetWorkingSetMB());
+
+        _node = _plcNodeManager.CreateVariableNode<uint>(variable);
+
+        // Add to node list for creation of pn.json.
+        Nodes =
+        [
+            PluginNodesHelper.GetNodeWithIntervals(variable.NodeId, _plcNodeManager),
+        ];
+    }
+
+    private uint GetWorkingSetMB() => (uint)(Process.GetCurrentProcess().WorkingSet64 / 1024 / 1024);
+}