Fails to execute TcUnit on TwinCAT 4026 user mode runtime

[piratecarrot]

Describe the bug
When running a TwinCAT XAE project on Beckhoff "TC1700 | TwinCAT 3 Usermode Runtime" including a PLC project with TcUnit as library reference some errors occur and the user mode runtime fails on startup.
Very similar to #222.

To Reproduce
Run a new XAE project including a PLC project.
Implemented program to ensure Usermode Runtime works, simple program with incrementing integer, everything works.
Then add TcUnit as library reference, cannot run program.

Screenshots

Software versions
TcUnit 1.3.1
TwinCAT 4026.18
Windows 10 Professional

Run environment
Windows 10 PC with Usermode Runtime

[sagatowski]

It seems you have IO enabled. Make sure you disable IO before running TcUnit.

[piratecarrot]

I have seen that suggestions elsewhere, and unless there is something else I am not aware of, I do not have any IO items. This was a fresh project to test this error.

[sagatowski]

Gotcha. Did you try to increase the memory in the usermode runtime environment?

https://download.beckhoff.com/download/document/automation/twincat3/TC170x_TC3_Usermode_Runtime_EN.pdf

[piratecarrot]

That did the trick, thank you.

For anyone interested, I edited the file located at

C:\ProgramData\Beckhoff\TwinCAT\3.1\Runtimes\UmRT_Default\3.1\TcRegistry.xml

and added the line noted with a comment.

<?xml version="1.0"?>
<TcRegistry>
	<Key Name="HKLM">
		<Key Name="Software">
			<Key Name="Beckhoff">
				<Key Name="TwinCAT3">
					<Value Name="CurrentVersion" Type="SZ">3.1</Value>
					<Key Name="System">
						<Value Name="RunAsDevice" Type="DW">1</Value>
						<Value Name="AmsNetId" Type="BIN">C7042AFA0101</Value>
						<Value Name="LockedMemSize" Type="DW">33554432</Value>
						<Value Name="HeapMemSizeMB" Type="DW">512</Value><!-- Added this line -->
						<Key Name="SymbolVersions">
							<Value Name="SymbolVersion851" Type="DW">17</Value>
						</Key>
					</Key>
					<Key Name="3.1">
						<Value Name="DriverAutoLoadDir" Type="SZ">C:\Program Files (x86)\Beckhoff\TwinCAT\3.1\Runtimes\bin\</Value>
						<Value Name="BootDir" Type="SZ">C:\ProgramData\Beckhoff\TwinCAT\3.1\Runtimes\UmRT_Default\3.1\Boot\</Value>
						<Value Name="ConfigDir" Type="SZ">C:\ProgramData\Beckhoff\TwinCAT\3.1\Runtimes\UmRT_Default\3.1\Config\</Value>
						<Value Name="InstallDir" Type="SZ">C:\ProgramData\Beckhoff\TwinCAT\3.1\Runtimes\UmRT_Default\3.1\</Value>
						<Value Name="TargetDir" Type="SZ">C:\ProgramData\Beckhoff\TwinCAT\3.1\Runtimes\UmRT_Default\3.1\Target\</Value>
					</Key>
					<Key Name="EventLogger">
						<Value Name="LastUniqueId" Type="DW">0</Value>
					</Key>
				</Key>
			</Key>
		</Key>
		<Key Name="Ident">
			<Value Name="DeviceType" Type="SZ">PC-WIN-U</Value>
		</Key>
	</Key>
</TcRegistry>

When I went to apply this to my library I am unit testing, I had to increase the heap memory again, and went to 1024MB.

[patgmiller]

This helped me #264 (comment), i had the exact same problem after adding the TcUnit library and the exact same error would occur when trying to activate with UmRT. Adding and setting the HeapMemSizeMB pair fixed it.

Thanks @piratecarrot and @sagatowski