# Problem with CUDA when installing PyFR on Windows10

**URL:** <https://pyfr.discourse.group/t/problem-with-cuda-when-installing-pyfr-on-windows10/454>\
**Category:** General\
**Created:** [5 August 2021 15:14 UTC](https://pyfr.discourse.group/t/problem-with-cuda-when-installing-pyfr-on-windows10/454 "2021-08-05T15:14:44Z")\
**Posts on this page:** 1\
**Showing post:** 12

<div class="post-metadata">

**Author:** ![Winxingtf](https://avatars.discourse-cdn.com/v4/letter/w/a9adbd/32.png) [@Winxingtf](https://pyfr.discourse.group/u/Winxingtf)\
**Post date:** [7 August 2021 17:02 UTC](https://pyfr.discourse.group/t/problem-with-cuda-when-installing-pyfr-on-windows10/454/12 "2021-08-07T17:02:14Z")

</div>

Hi Nigel,

I was trying to compare the performance using different backend, the CUDA and the OpenMP. The compilation with CUDA backend went well as the way you replied. However, while I ran the simulation with OpenMP backend, an error came up as

```auto
Traceback (most recent call last):
  File "e:\pyfr_test\pyfr\util.py", line 33, in __call__
    res = cache[key]
KeyError: (<function OpenMPKernelProvider._build_kernel at 0x0000020D34FE7EE0>, b'\x80\x04\x955\x03\x00\x00\x00\x00\x00\x00\x8c\nbatch_gemm\x94X\xf3\x02\x00\x00\n\n#include <omp.h>\n#include <stdlib.h
>\n#include <tgmath.h>\n\n#define SOA_SZ 8\n#define BLK_SZ 8\n\n#define min(a, b) ((a) < (b) ? (a) : (b))\n#define max(a, b) ((a) > (b) ? (a) : (b))\n\n// Typedefs\ntypedef double fpdtype_t;\n\n\n\n//
 libxsmm prototype\ntypedef void (*libxsmm_xfsspmdm_execute)(void *, const fpdtype_t *,\n fpdtype_t *);\n\n// gimmik prototype\ntypedef void (*gimmik_execute)(i
nt, const fpdtype_t *, int, fpdtype_t *, int);\n\nvoid\nbatch_gemm(gimmik_execute exec, int bldim,\n int nblocks,\n const fpdtype_t *b, int bblocksz, fpdtype_t *c, int cblocksz)\n{
\n #pragma omp parallel for\n for (int ib = 0; ib < nblocks; ib++)\n exec(bldim, b + ib*bblocksz, bldim, c + ib*cblocksz, bldim);\n}\n\n\x94]\x94(\x8c\x05numpy\x94\x8c\x05int64\x94\x93\x9
4h\x03\x8c\x05int32\x94\x93\x94h\x07h\x05h\x07h\x05h\x07e\x87\x94.', b'\x80\x04}\x94.')

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "E:\Anaconda\envs\pyfr_tf\Scripts\pyfr-script.py", line 33, in <module>
    sys.exit(load_entry_point('pyfr', 'console_scripts', 'pyfr')())
  File "e:\pyfr_test\pyfr\ __main__.py", line 117, in main
    args.process(args)
  File "e:\pyfr_test\pyfr\ __main__.py", line 250, in process_run
    _process_common(
  File "e:\pyfr_test\pyfr\ __main__.py", line 232, in _process_common
    solver = get_solver(backend, rallocs, mesh, soln, cfg)
  File "e:\pyfr_test\pyfr\solvers\ __init__.py", line 16, in get_solver
    return get_integrator(backend, systemcls, rallocs, mesh, initsoln, cfg)
  File "e:\pyfr_test\pyfr\integrators\ __init__.py", line 36, in get_integrator
    return integrator(backend, systemcls, rallocs, mesh, initsoln, cfg)
  File "e:\pyfr_test\pyfr\integrators\std\controllers.py", line 13, in __init__
    super(). __init__ (*args, **kwargs)
  File "e:\pyfr_test\pyfr\integrators\std\base.py", line 27, in __init__
    self.system = systemcls(backend, rallocs, mesh, initsoln,
  File "e:\pyfr_test\pyfr\solvers\base\system.py", line 68, in __init__
    self._gen_kernels(eles, int_inters, mpi_inters, bc_inters)
  File "e:\pyfr_test\pyfr\solvers\base\system.py", line 187, in _gen_kernels
    kernels[pn, kn].append(kgetter())
  File "e:\pyfr_test\pyfr\solvers\baseadvec\elements.py", line 45, in <lambda>
    kernels['disu'] = lambda: self._be.kernel(
  File "e:\pyfr_test\pyfr\backends\base\backend.py", line 163, in kernel
    return kern(*args, **kwargs)
  File "e:\pyfr_test\pyfr\backends\openmp\gimmik.py", line 48, in mul
    batch_gemm = self._build_kernel('batch_gemm', src, argt)
  File "e:\pyfr_test\pyfr\util.py", line 35, in __call__
    res = cache[key] = self.func(*args, **kwargs)
  File "e:\pyfr_test\pyfr\backends\openmp\provider.py", line 13, in _build_kernel
    mod = SourceModule(src, self.backend.cfg)
  File "e:\pyfr_test\pyfr\backends\openmp\compiler.py", line 65, in __init__
    self.mod = self._cache_set_and_loadlib(lpath)
  File "e:\pyfr_test\pyfr\backends\openmp\compiler.py", line 130, in _cache_set_and_loadlib
    return CDLL(clpath)
  File "E:\Anaconda\envs\pyfr_tf\lib\ctypes\ __init__.py", line 373, in __init__
    self._handle = _dlopen(self._name, mode)
FileNotFoundError: Could not find module 'C:\Users\Thatcher\AppData\Local\pyfr\pyfr\Cache\c8188542ba03ceef8f44731c24cb91566c3cecd078454acb4da2577a34372d9f.dll' (or one of its dependencies). Try using the
full path with constructor syntax.

```

Actually, I searched in this forum and found several questions relates to a similar problem, but all of them seems to exist with older versions. With years of update, I believe some sort of questions or bugs may be solved with renovation. During the compilation of OpenMP, I installed MS-MPI, GCC (by MinGW) and mpi4py, all of them are added to the environment. (Ref. [Installation Steps](https://pyfr.discourse.group/t/how-i-installed-pyfr-1-6-0-with-cuda-backend-and-dependancies-on-windows-10/167))

I have to admit that `libxsmm.dll` is absent, still have some problems to [make it available](https://github.com/hfp/libxsmm/issues/71). But to me, the above error had nothing to do with libxsmm, for it will work under certain dense and sparse matrix operations, clearly not suitable to the situation. So I was wondering if I was missing something? Or anything to be careful with these steps?

PS. I think it’s better for me to rename this topic since the problem extends to how to compile and run PyFR on Windows10 both with CUDA and OpenMP. 😀

---

_[View the full topic](https://pyfr.discourse.group/t/problem-with-cuda-when-installing-pyfr-on-windows10/454)._