Issue with FMU using an external resource

[modelonrobinandersson]

With the model Modelica.Utilities.Examples.readRealParameterModel I generated a CS FMU using OCT.
Then I import this FMU Modelica_Utilities_Examples_readRealParameterModel.fmu into a dummy library using Modelica-FMI, for simplicity let's say I import it into library MyLibrary as MSLModel. Then I generate an FMU from MyLibrary.MSLModel and try to simulate this. I get the following error while the initialization is starting:

FMIL: module = FMICAPI, log level = 5: Calling fmi2SetupExperiment
FMIL: module = FMICAPI, log level = 5: Calling fmi2EnterInitializationMode
...
FMIL: module = Model, log level = 3: [WARNING][FMU status:Warning] <ModelicaMessage category="warning"><value name="msg">"&lt;Error category=""error""&gt;Could not locate resource &lt;value name=""File""&gt;""/ws/0/Examples_readRealParameters.txt""&lt;/value&gt;&lt;/Error&gt;&#10;"</value></ModelicaMessage>

It is a bit hard to read but the important part is:

Could not locate resource /ws/0/Examples_readRealParameters.txt

I can add that:

1. In the FMU that is imported the resource exists at <FMU>/resources/0/Examples_readRealParameters.txt
2. /ws/ is the top level path, I have my library at /ws/fmus/MyLibrary.
3. I can verify that the file exists after import /ws/fmus/MyLibrary/Resources/FMUs/c156664/resources/0/Examples_readRealParameters.txt
4. My working directory while getting the error above is /ws/fmus

Any idea what is wrong here? This example works for me with another FMU to Modelica Import tool. It looks like the path that is used for the resource file is the path from the FMU (which is expected) but concatenated with the incorrect path /ws/ in this case.

[t-sommer]

Can you enable FMI call logging and share the output?

[modelonrobinandersson]

Hi @t-sommer, with loggingOn, logToFile and logFMICalls set to true I get the following output (note that it just abruptly ends). Note however that the error I observe is the same regardless of these three parameters.

[MSLModel] fmi2Instantiate(instanceName="MSLModel", fmuType=1, fmuGUID="37ecfc8c04d30bab92c3247eabed5138", fmuResourceLocation="file:///ws", functions={logger=0x0x7f3b14123b9c, allocateMemory=0x0x7f3b51825b10, freeMemory=0x0x7f3b518246d0, stepFinished=0x(nil), componentEnvironment=0x0x55e9a815a6c0}, visible=0, loggingOn=1) -> OK
[MSLModel] fmi2SetBoolean(vr={536870944}, nvr=1, value={0}) -> OK
[MSLModel] fmi2SetReal(vr={0}, nvr=1, value={1e-06}) -> OK
[MSLModel] fmi2SetInteger(vr={268435475}, nvr=1, value={0}) -> OK
[MSLModel] fmi2SetBoolean(vr={536870945}, nvr=1, value={0}) -> OK
[MSLModel] fmi2SetInteger(vr={268435476}, nvr=1, value={0}) -> OK
[MSLModel] fmi2SetBoolean(vr={536870946}, nvr=1, value={0}) -> OK
[MSLModel] fmi2SetReal(vr={1}, nvr=1, value={1e-06}) -> OK
[MSLModel] fmi2SetInteger(vr={268435477}, nvr=1, value={0}) -> OK
[MSLModel] fmi2SetReal(vr={2}, nvr=1, value={0.001}) -> OK
[MSLModel] fmi2SetBoolean(vr={536870947}, nvr=1, value={1}) -> OK
[MSLModel] fmi2SetReal(vr={3}, nvr=1, value={1e-10}) -> OK
[MSLModel] fmi2SetReal(vr={4}, nvr=1, value={0.0001}) -> OK
[MSLModel] fmi2SetInteger(vr={268435478}, nvr=1, value={1}) -> OK
[MSLModel] fmi2SetInteger(vr={268435479}, nvr=1, value={3}) -> OK
[MSLModel] fmi2SetReal(vr={5}, nvr=1, value={-1e+20}) -> OK
[MSLModel] fmi2SetReal(vr={6}, nvr=1, value={1e+20}) -> OK
[MSLModel] fmi2SetInteger(vr={268435480}, nvr=1, value={-1}) -> OK
[MSLModel] fmi2SetInteger(vr={268435481}, nvr=1, value={0}) -> OK
[MSLModel] fmi2SetBoolean(vr={536870948}, nvr=1, value={0}) -> OK
[MSLModel] fmi2SetInteger(vr={268435482}, nvr=1, value={0}) -> OK
[MSLModel] fmi2SetReal(vr={7}, nvr=1, value={1.490116119384766e-08}) -> OK
[MSLModel] fmi2SetInteger(vr={268435483}, nvr=1, value={2}) -> OK
[MSLModel] fmi2SetBoolean(vr={536870949}, nvr=1, value={0}) -> OK
[MSLModel] fmi2SetReal(vr={8}, nvr=1, value={1e-10}) -> OK
[MSLModel] fmi2SetInteger(vr={268435484}, nvr=1, value={3}) -> OK
[MSLModel] fmi2SetInteger(vr={268435485}, nvr=1, value={100}) -> OK
[MSLModel] fmi2SetInteger(vr={268435486}, nvr=1, value={10}) -> OK
[MSLModel] fmi2SetReal(vr={9}, nvr=1, value={10000000000}) -> OK
[MSLModel] fmi2SetReal(vr={10}, nvr=1, value={1e-10}) -> OK
[MSLModel] fmi2SetReal(vr={11}, nvr=1, value={1e-12}) -> OK
[MSLModel] fmi2SetReal(vr={12}, nvr=1, value={-1}) -> OK
[MSLModel] fmi2SetReal(vr={13}, nvr=1, value={10}) -> OK
[MSLModel] fmi2SetReal(vr={14}, nvr=1, value={0.0001}) -> OK
[MSLModel] fmi2SetBoolean(vr={536870950}, nvr=1, value={1}) -> OK
[MSLModel] fmi2SetBoolean(vr={536870951}, nvr=1, value={1}) -> OK
[MSLModel] fmi2SetBoolean(vr={536870952}, nvr=1, value={1}) -> OK
[MSLModel] fmi2SetBoolean(vr={536870953}, nvr=1, value={0}) -> OK
[MSLModel] fmi2SetInteger(vr={268435487}, nvr=1, value={1}) -> OK
[MSLModel] fmi2SetBoolean(vr={536870954}, nvr=1, value={0}) -> OK
[MSLModel] fmi2SetReal(vr={15}, nvr=1, value={2.220446049250313e-14}) -> OK
[MSLModel] fmi2SetBoolean(vr={536870955}, nvr=1, value={1}) -> OK
[MSLModel] fmi2SetBoolean(vr={536870956}, nvr=1, value={0}) -> OK
[MSLModel] fmi2SetBoolean(vr={536870

[t-sommer]

Can you verify that Modelica.Utilities.Files.loadResource("modelica://MyLibrary/Resources/FMUs/c156664") is resolved correctly before it is passed to FMI.Internal.ExternalFMU?

[modelonrobinandersson]

@t-sommer I added:

• In the generated model I added a public parameter parameter String ppp = Modelica.Utilities.Files.loadResource("modelica://MyLibrary/Resources/FMUs/c156664"); and then passed ppp to FMI.Internal.ExternalFMU(ppp, ...)
• In file ModelicaFMI.c function FMU_load on line 78 (beginning of the function) I added printf("unzipdir = %s\n", unzipdir); and I observe via IPython and PyFMI:

In [5]: fmu = load_fmu('MyLibrary_MSLModel.fmu')
In [6]: fmu.get('ppp')
unzipdir = /ws/fmus/MyLibrary/Resources/FMUs/c156664
Out[6]: ['/ws/fmus/MyLibrary/Resources/FMUs/c156664']
... 

This path exists on my computer and is the expected path.

[t-sommer]

With 3ee6052 and Dymola 2024x Refresh 1 Beta 1 I can successfully nest Modelica.Utilities.Examples.readRealParameterModel within an FMU for both FMI 2.0 and 3.0.

[modelonrobinandersson]

Hi @t-sommer, with 3ee6052 I can confirm it resolves the originally reported error. However now I observe a different error:

FMIL: module = FMICAPI, log level = 5: Calling fmi2SetupExperiment
FMIL: module = FMICAPI, log level = 5: Calling fmi2EnterInitializationMode
FMIL: module = Model, log level = 3: [WARNING][FMU status:Warning] <ModelicaError category="warning"><value name="msg">"Failed to create temporary directory. Command: mkdir ""/tmp/fmusim.v27Rm5"""</value></ModelicaError>
FMIL: module = Model, log level = 2: [ERROR][FMU status:Error] <DependentParametersEvaluationFailed category="error">Error evaluating dependent parameters and start values</DependentParametersEvaluationFailed>
FMIL: module = Model, log level = 2: [INFO][FMU status:Error] Error evaluating dependent parameters. Initialization failed.

I also have loggingOn = true and logToFile = true but the logFile was never created. This was tested on Ubuntu 20.04.

[t-sommer]

The double quotes in mkdir ""/tmp/fmusim.v27Rm5"" look suspicious. 🤔

[t-sommer]

@modelonrobinandersson, can you try to remove the extra quotes in https://github.com/modelica/Modelica-FMI/blob/main/FMI/Resources/Include/ModelicaFMI.c#L115 and try again?

[modelonrobinandersson]

@t-sommer sorry I haven't had time to test it yet but will do it either tomorrow or by Wednesday latest.

[modelonrobinandersson]

@t-sommer
I removed the quotes, i.e changed it to ..., "mkdir %s", ....
I then see mkdir: cannot create directory ‘/tmp/fmusim.rDoFww’: File exists

I updated mkdir %s to mkdir -p %s and then I receive a segmentation fault in FMU_load and the entire application crashes. I used 71cd815.

[t-sommer]

@modelonrobinandersson, did you try to debug the container FMU?

[modelonrobinandersson]

@t-sommer I haven't had time yet, I'll see if I can look further into it by tomorrow earliest.

[modelonrobinandersson]

Hi @t-sommer I cannot see anything obvious that is wrong, it crashes (with my update to L115 snprintf(command, 4096, "mkdir -p %s", userData->tempBinaryDir);
here:

at /workspace/Modelica-FMI/FMI/Resources/Include/ModelicaFMI.c:121
121             userData->tempBinaryPath = (char*)calloc(1, strlen(userData->tempBinaryDir) + strlen(separator) + strlen(modelIdentifier) + strlen(extension) + 1);

when I print these they look as below:

(gdb) print userData->tempBinaryDir
$1 = 0x5556ad1334b0 "/tmp/fmusim.1zKrdC"
(gdb) print separator
$2 = 47 '/'
(gdb) print modelIdentifier
$3 = 0x5556ad172fba "Modelica_Utilities_Examples_readRealParameterModel"
(gdb) print extension
$4 = 0x7f6a1d7ece0b ".so"

[t-sommer]

@modelonrobinandersson, can you check if the problem still exists with v0.0.4?