This is an MPI setup issue, and the solution likely depends on the particular distribution you are using.
All I can do is tell you that I am using the Microsoft MPI package (which ends up being installed under C:/Program Files (x86)/Microsoft SDKs/MPI/). I have the following relevant environment variables defined (which, if I recall correctly, were automatically set during installation of MS MPI): MSMPI_BENCHMARKS C:\Program Files\Microsoft MPI\Benchmarks\ MSMPI_BIN C:\Program Files\Microsoft MPI\Bin\ MSMPI_INC C:\Program Files (x86)\Microsoft SDKs\MPI\Include\ MSMPI_LIB32 C:\Program Files (x86)\Microsoft SDKs\MPI\Lib\x86\ MSMPI_LIB64 C:\Program Files (x86)\Microsoft SDKs\MPI\Lib\x64\ Then, I have the following in the PATH environment variable: C:\Program Files\Microsoft MPI\Bin\ For configuring Chrono with MPI support, we simply use CMake’s own FindMPI (I use CMake version 3.25.1). This is what the output from running the Chrono CMake configuration gives me: Searching for MPI... MPI compiler: MPI_CXX_COMPILER-NOTFOUND MPI compile flags: MPI include path: C:/Program Files (x86)/Microsoft SDKs/MPI/Include MPI link flags: MPI libraries: C:/Program Files (x86)/Microsoft SDKs/MPI/Lib/x64/msmpi.lib MPIEXEC: C:/Program Files/Microsoft MPI/Bin/mpiexec.exe MPIEXEC_NUMPROC_FLAG: -n MPIEXEC_PREFLAGS: MPIEXEC_POSTFLAGS: --Radu From: [email protected] <[email protected]> On Behalf Of Prakhar Gupta Sent: Thursday, December 7, 2023 5:19 PM To: ProjectChrono <[email protected]> Subject: Re: [chrono] Failing to build Demos Following up on this- I see multiple people have asked about this on the forum. I am trying to use the VehicleCosim module, but I can't build it on a Windows machine because CMake fails to find the MPI libraries. I have tried msmpi and Intel MPI, both. Is it likely to be an issue with the environment variables? Which environment variables is the CMake looking for? PS: I was able to build this on Linux, with mpich. But my linux machine does not have a GPU, and was hoping to setup Chrono on the Windows machine. Thanks! On Tuesday 24 January 2023 at 13:25:37 UTC-5 [email protected]<mailto:[email protected]> wrote: Hey Radu, Thank you for your help. I think I messed something else up when I tried to rebuild initially because it did not seem to help. However, I deleted the old folder and re-cloned and then did the submodule update and it appears to have built with no errors. I do however, have another question. I can post this in a separate conversation if that is preferred... I am having issues with finding the MPI library. I have installed the Intel version(One API). Cmake still says it can not find MPI and thus is disabling some of the vehicle module stuff. This shouldn't be an issue for right now, but mostly I am just curious what I am doing wrong. I have looked all over google and this group and I can not seem to find what I am looking for. Attached are the modules I have enabled as well as the MPI variables in Cmake. Any idea why it is not finding them? Thank you! Benjamin [https://groups.google.com/group/projectchrono/attach/3ec05aefb69/enabledModules.PNG?part=0.1&view=1][https://groups.google.com/group/projectchrono/attach/3ec05aefb69/mpiSettings.PNG?part=0.2&view=1] On Monday, January 23, 2023 at 4:58:26 PM UTC-5 Radu Serban wrote: Benjamin, It looks like you did not initialize the git submodules. In a terminal, go to where you have cloned the Chrono source (which for you appears to be C:/WorkSpace/ProjectChrono/chrono) and type: % git submodule init % git submodule update Then rebuild the solution. What happened is that, because you do not have these submodules (in particular chpf), the Chrono FSI library couldn’t build which meant the vehicle co-simulation library couldn’t build which finally resulted in demos depending on one of these libraries not building. --Radu From: [email protected]<mailto:[email protected]> <[email protected]<mailto:[email protected]>> On Behalf Of Benjamin Johnson Sent: Monday, 23 January 2023 22:49 To: ProjectChrono <[email protected]<mailto:[email protected]>> Subject: [chrono] Failing to build Demos Hello, I am having trouble getting Project Chrono installed on my Windows machine. It seems to be a linker error, but I am not really sure. Cmake does not show any errors(in red) when I configure. I am not really sure where to go from here. Any suggestions on things to try or resources to check would be grealy appreciated. I am seeing a lot of errors like this: 219>LINK : fatal error LNK1104: cannot open file '..\..\..\..\lib\Debug\ChronoEngine_vehicle_cosim.lib' 219>Done building project "demo_VEH_Cosim_WheelRig.vcxproj" -- FAILED. I am attaching the build output as well as the cmake config file incase that is helpful. I am using Visual Studio 2022 to build the project. Thanks for any help you can offer. Cheers, Benjamin -- You received this message because you are subscribed to the Google Groups "ProjectChrono" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]<mailto:[email protected]>. 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![https://groups.google.com/group/projectchrono/attach/3ec05aefb69/enabledModules.PNG?part=0.1&view=1][https://groups.google.com/group/projectchrono/attach/3ec05aefb69/mpiSettings.PNG?part=0.2&view=1](https://groups.google.com/group/projectchrono/attach/3ec05aefb69/enabledModules.PNG?part=0.1&view=1][https://groups.google.com/group/projectchrono/attach/3ec05aefb69/mpiSettings.PNG?part=0.2&view=1){kind=link}