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WriteMultipleItemValues gets stuck

KrisSik
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14 May 2025 05:32 #14181 by KrisSik

Replied by KrisSik on topic WriteMultipleItemValues gets stuck

Hi,

Thank you for the response.
Right now I am testing my app with disabled boxers, and it's running fine for a few days already. If this will fail, I will try your suggestion and let you know.

Best regards,
Kristian

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support
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13 May 2025 09:43 #14180 by support

Replied by support on topic WriteMultipleItemValues gets stuck

Oh, I see, thank you.

You have provided the right stack trace. The issue is that many of the frames are optimized away, which confused me at first, and also makes the diagnostics much harder, because the part I am looking for is not displayed.

Can you please try to disable the OPC DA optimizer ( opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Late...html#OPC%20DA%20Optimizer.html )

This has to be done on every instance of EasyDAClient *before* any actuals OPC operations are called:

 

            var client = new EasyDAClient();

            client.InstanceParameters.PluginSetups[EasyDAUriStrings.OptimizerPlugin].Enabled = false;

There is a chance that this helps.

Best regards

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KrisSik
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12 May 2025 08:58 #14178 by KrisSik

Replied by KrisSik on topic WriteMultipleItemValues gets stuck

Please check this stack trace:

Code:

System.Linq.Parallel.OrderPreservingPipeliningMergeHelper`2+OrderedPipeliningMergeEnumerator[[System.__Canon, System.Private.CoreLib],[System.Int32, System.Private.CoreLib]].TryWaitForElement(Int32, System.Linq.Parallel.Pair`2<Int32,System.__Canon> ByRef)+bc    
System.Linq.Parallel.OrderPreservingPipeliningMergeHelper`2+OrderedPipeliningMergeEnumerator[[System.__Canon, System.Private.CoreLib],[System.Int32, System.Private.CoreLib]].MoveNext()+5d    
System.Linq.Parallel.QueryOpeningEnumerator`1[[System.__Canon, System.Private.CoreLib]].MoveNext()+36    
System.Collections.Generic.List`1[[System.__Canon, System.Private.CoreLib]]..ctor(System.Collections.Generic.IEnumerable`1<System.__Canon>)+1f2    
System.Linq.Enumerable.ToList[[System.__Canon, System.Private.CoreLib]](System.Collections.Generic.IEnumerable`1<System.__Canon>)+9a    
OpcLabs.EasyOpc.DataAccess.Internal.DelegatingEasyDAClient.WriteMultipleItemValues(OpcLabs.EasyOpc.DataAccess.OperationModel.DAItemValueArguments[])+12c    
OpcLabs.BaseLib.Threading.Extensions.IParallelismExtension+<>c__DisplayClass4_1`3[[System.__Canon, System.Private.CoreLib],[System.__Canon, System.Private.CoreLib],[System.__Canon, System.Private.CoreLib]].<GroupSelect>b__1()+e0    
OpcLabs.BaseLib.Threading.TaskParallelism.Perform(System.Collections.Generic.IEnumerable`1<System.Action>)+96    
OpcLabs.BaseLib.Threading.Extensions.IParallelismExtension.GroupSelect[[System.__Canon, System.Private.CoreLib],[System.__Canon, System.Private.CoreLib],[System.__Canon, System.Private.CoreLib]](OpcLabs.BaseLib.Threading.IParallelism, System.Collections.Generic.IEnumerable`1<System.__Canon>, System.Func`2<System.__Canon,System.__Canon>, System.Func`3<System.__Canon,System.Collections.Generic.IEnumerable`1<System.__Canon>,System.__Canon[]>, System.Collections.Generic.IEqualityComparer`1<System.__Canon>)+24d    
OpcLabs.BaseLib.Threading.Extensions.IParallelismExtension.GroupSelect[[System.__Canon, System.Private.CoreLib],[System.__Canon, System.Private.CoreLib],[System.__Canon, System.Private.CoreLib]](OpcLabs.BaseLib.Threading.IParallelism, System.Collections.Generic.IEnumerable`1<System.__Canon>, System.Func`2<System.__Canon,System.__Canon>, System.Func`3<System.__Canon,System.Collections.Generic.IEnumerable`1<System.__Canon>,System.__Canon[]>)+cf    
OpcLabs.EasyOpc.DataAccess.Implementation.EasyDAClientCompositor.WriteMultipleItemValues(OpcLabs.EasyOpc.DataAccess.OperationModel.DAItemValueArguments[])+ca    
MyApplication.Opc.Connection.OpcClient.WriteItems(System.Collections.Generic.IEnumerable`1<MyApplication.Opc.Data.WriteItemRequest>)+7a6 

Basically my WriteItems implementation is:

Code:

        public IReadOnlyCollection<WriteItemResponse> WriteItems(IEnumerable<WriteItemRequest> requests)
        {
            var requestsList = requests.ToList();
            _logger.Debug(
                "Writing multiple items. Item: {@Item}",
                requestsList);

            OperationResult[] writeResults =
                _opcClient.[b]WriteMultipleItemValues[/b](requestsList.Select(r => new DAItemValueArguments(_opcServer, new DAItemDescriptor(r.ItemId), r.Value, r)).ToArray());

            _logger.Debug("Stopped writing items [{FirstItem},..].", requestsList.First());

            return writeResults.Select(Map).ToList();
        }

Thank you.

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support
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12 May 2025 08:25 #14176 by support

Replied by support on topic WriteMultipleItemValues gets stuck

Thank you,

but somehow this is still missing the initiating call and many part below. Perhaps it was done on another thread? Can you inspect the list of threads, and find the one that has *your* call to WriteMultipleItemValues? It is not in this call stack.

Best regards

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KrisSik
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12 May 2025 04:55 #14175 by KrisSik

Replied by KrisSik on topic WriteMultipleItemValues gets stuck

I missed "[]" in my topic message. Please check out this stack trace:System.Linq.Parallel.OrderPreservingPipeliningMergeHelper`2+OrderedPipeliningMergeEnumerator[[System.__Canon, System.Private.CoreLib],[System.Int32, System.Private.CoreLib]].TryWaitForElement(Int32, System.Linq.Parallel.Pair`2<Int32,System.__Canon> ByRef)+bc System.Linq.Parallel.OrderPreservingPipeliningMergeHelper`2+OrderedPipeliningMergeEnumerator[[System.__Canon, System.Private.CoreLib],[System.Int32, System.Private.CoreLib]].MoveNext()+5d System.Linq.Parallel.QueryOpeningEnumerator`1[[System.__Canon, System.Private.CoreLib]].MoveNext()+36 System.Collections.Generic.List`1[[System.__Canon, System.Private.CoreLib]]..ctor(System.Collections.Generic.IEnumerable`1<System.__Canon>)+1f2 System.Linq.Enumerable.ToList[[System.__Canon, System.Private.CoreLib]](System.Collections.Generic.IEnumerable`1<System.__Canon>)+9a OpcLabs.EasyOpc.DataAccess.Internal.DelegatingEasyDAClient.WriteMultipleItemValues(OpcLabs.EasyOpc.DataAccess.OperationModel.DAItemValueArguments[])+12c OpcLabs.BaseLib.Threading.Extensions.IParallelismExtension+<>c__DisplayClass4_1`3[[System.__Canon, System.Private.CoreLib],[System.__Canon, System.Private.CoreLib],[System.__Canon, System.Private.CoreLib]].<GroupSelect>b__1()+e0 OpcLabs.BaseLib.Threading.TaskParallelism.Perform(System.Collections.Generic.IEnumerable`1<System.Action>)+96 OpcLabs.BaseLib.Threading.Extensions.IParallelismExtension.GroupSelect[[System.__Canon, System.Private.CoreLib],[System.__Canon, System.Private.CoreLib],[System.__Canon, System.Private.CoreLib]](OpcLabs.BaseLib.Threading.IParallelism, System.Collections.Generic.IEnumerable`1<System.__Canon>, System.Func`2<System.__Canon,System.__Canon>, System.Func`3<System.__Canon,System.Collections.Generic.IEnumerable`1<System.__Canon>,System.__Canon[]>, System.Collections.Generic.IEqualityComparer`1<System.__Canon>)+24d OpcLabs.BaseLib.Threading.Extensions.IParallelismExtension.GroupSelect[[System.__Canon, System.Private.CoreLib],[System.__Canon, System.Private.CoreLib],[System.__Canon, System.Private.CoreLib]](OpcLabs.BaseLib.Threading.IParallelism, System.Collections.Generic.IEnumerable`1<System.__Canon>, System.Func`2<System.__Canon,System.__Canon>, System.Func`3<System.__Canon,System.Collections.Generic.IEnumerable`1<System.__Canon>,System.__Canon[]>)+cf OpcLabs.EasyOpc.DataAccess.Implementation.EasyDAClientCompositor.WriteMultipleItemValues(OpcLabs.EasyOpc.DataAccess.OperationModel.DAItemValueArguments[])+ca

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KrisSik
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12 May 2025 04:50 #14174 by KrisSik

Replied by KrisSik on topic WriteMultipleItemValues gets stuck

Hi,

It is there - OpcLabs.EasyOpc.DataAccess.Implementation.EasyDAClientCompositor.WriteMultipleItemValues(OpcLabs.EasyOpc.DataAccess.OperationModel.DAItemValueArguments[]).

Best regards,
Kristian

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support
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09 May 2025 05:52 #14167 by support

Replied by support on topic WriteMultipleItemValues gets stuck

Hello.

Is this the whole call stack you can get? It appears incomplete. It should contain at least the top-level "Write" call you are making, plus everything below.

Best regards

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KrisSik
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07 May 2025 09:18 - 07 May 2025 09:25 #14164 by KrisSik

WriteMultipleItemValues gets stuck was created by KrisSik

Hi,

I encoutered an issue with the WriteMultipleItemValues method, which gets stuck when interacting with the OPC DA server. I can see this issue in both the logs and dump files. I captured 2 dump files - about 5 minutes apart after the application got stuck - and the same thread with the same stack trace is hanging in both:

Code:

System.Linq.Parallel.OrderPreservingPipeliningMergeHelper`2+OrderedPipeliningMergeEnumerator[[System.__Canon, System.Private.CoreLib],[System.Int32, System.Private.CoreLib]].TryWaitForElement(Int32, System.Linq.Parallel.Pair`2<Int32,System.__Canon> ByRef)+bc    
System.Linq.Parallel.OrderPreservingPipeliningMergeHelper`2+OrderedPipeliningMergeEnumerator[[System.__Canon, System.Private.CoreLib],[System.Int32, System.Private.CoreLib]].MoveNext()+5d    
System.Linq.Parallel.QueryOpeningEnumerator`1[[System.__Canon, System.Private.CoreLib]].MoveNext()+36    
System.Collections.Generic.List`1[[System.__Canon, System.Private.CoreLib]]..ctor(System.Collections.Generic.IEnumerable`1<System.__Canon>;)+1f2    
System.Linq.Enumerable.ToList[[System.__Canon, System.Private.CoreLib]](System.Collections.Generic.IEnumerable`1<System.__Canon>;)+9a    
OpcLabs.EasyOpc.DataAccess.Internal.DelegatingEasyDAClient.WriteMultipleItemValues(OpcLabs.EasyOpc.DataAccess.OperationModel.DAItemValueArguments)+12c    
OpcLabs.BaseLib.Threading.Extensions.IParallelismExtension+<>c__DisplayClass4_1`3[[System.__Canon, System.Private.CoreLib],[System.__Canon, System.Private.CoreLib],[System.__Canon, System.Private.CoreLib]].<GroupSelect>b__1()+e0    
OpcLabs.BaseLib.Threading.TaskParallelism.Perform(System.Collections.Generic.IEnumerable`1<System.Action>;)+96    
OpcLabs.BaseLib.Threading.Extensions.IParallelismExtension.GroupSelect[[System.__Canon, System.Private.CoreLib],[System.__Canon, System.Private.CoreLib],[System.__Canon, System.Private.CoreLib]](OpcLabs.BaseLib.Threading.IParallelism, System.Collections.Generic.IEnumerable`1<System.__Canon>, System.Func`2<System.__Canon,System.__Canon>, System.Func`3<System.__Canon,System.Collections.Generic.IEnumerable`1<System.__Canon>,System.__Canon>, System.Collections.Generic.IEqualityComparer`1<System.__Canon>;)+24d    
OpcLabs.BaseLib.Threading.Extensions.IParallelismExtension.GroupSelect[[System.__Canon, System.Private.CoreLib],[System.__Canon, System.Private.CoreLib],[System.__Canon, System.Private.CoreLib]](OpcLabs.BaseLib.Threading.IParallelism, System.Collections.Generic.IEnumerable`1<System.__Canon>, System.Func`2<System.__Canon,System.__Canon>, System.Func`3<System.__Canon,System.Collections.Generic.IEnumerable`1<System.__Canon>,System.__Canon>;)+cf    
OpcLabs.EasyOpc.DataAccess.Implementation.EasyDAClientCompositor.WriteMultipleItemValues(OpcLabs.EasyOpc.DataAccess.OperationModel.DAItemValueArguments)+ca 

The EasyDAClient.InstanceParameters.Timeouts.WriteItem is set to 2000ms, but seems to be not respected in this case.

I've also tested several versions of OpcLabs.QuickOpc, and while the number of items is identical, there is a difference in how quickly the issue reproduces:
- for versions 5.81.485 and 5.80.347 it takes a few minutes (sometimes a few seconds) of application running
- for version 5.63.246 it takes from a few hours to a few days of application running

My application is using .NET 6.

Best regards,
Kristian

Last edit: 07 May 2025 09:25 by KrisSik.

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