# Problem with MPI\_Comm in ParaView 5.10.0 RC1 when using External MPI version
**URL:** https://discourse.paraview.org/t/problem-with-mpi-comm-in-paraview-5-10-0-rc1-when-using-external-mpi-version/8222
**Category:** Development
**Created:** [October 19, 2021, 7:59pm UTC](https://discourse.paraview.org/t/problem-with-mpi-comm-in-paraview-5-10-0-rc1-when-using-external-mpi-version/8222 "2021-10-19T19:59:20Z")
**Posts on this page:** 7
**Page:** 2
### Author:  [@joeh](https://discourse.paraview.org/u/joeh)
#### Post date: [October 21, 2021, 2:10pm UTC](https://discourse.paraview.org/t/problem-with-mpi-comm-in-paraview-5-10-0-rc1-when-using-external-mpi-version/8222/21 "2021-10-21T14:10:51Z")
Ben,
If I set
-DENABLE\_mpi=ON \
-DUSE\_SYSTEM\_mpi=ON \
-DSUPERBUILD\_PROJECT\_PARALLELISM=20 \
and then use
make -j 20 -l 20 install
Then I am making a parallel build with an external mpi version, that is also built in parallel, correct?
I have
-DENABLE\_netcdf=ON \
but I have not explicitly set HDF5
but it is being built as it is a prerequisite for netcdf
– Enabling hdf5 for: netcdf
Thanks,
Joe
---
### Author:  [@Gregory\_Sjaardema](https://discourse.paraview.org/u/Gregory_Sjaardema)
#### Post date: [October 21, 2021, 4:17pm UTC](https://discourse.paraview.org/t/problem-with-mpi-comm-in-paraview-5-10-0-rc1-when-using-external-mpi-version/8222/22 "2021-10-21T16:17:59Z")
There were some issues with compiling with MPI compilers and a serial CGNS / HDF5. Those have been fixed in the latest seacas master branch.
---
### Author:  [@ben.boeckel](https://discourse.paraview.org/u/ben.boeckel)
#### Post date: [October 26, 2021, 12:55pm UTC](https://discourse.paraview.org/t/problem-with-mpi-comm-in-paraview-5-10-0-rc1-when-using-external-mpi-version/8222/23 "2021-10-26T12:55:29Z")
> [@joeh](#):
>
> Then I am making a parallel build with an external mpi version, that is also built in parallel, correct?
I don’t care at all about how many `-j` cores the build process uses. I care whether you’re using MPI. This says you are (`-DENABLE_mpi=ON`).
> [@Gregory\_Sjaardema](#):
>
> There were some issues with compiling with MPI compilers and a serial CGNS / HDF5. Those have been fixed in the latest seacas master branch.
Thanks, I’ll look at pulling those patches in (since we prefer to sit on tags).
---
### Author:  [@ben.boeckel](https://discourse.paraview.org/u/ben.boeckel)
#### Post date: [October 26, 2021, 1:33pm UTC](https://discourse.paraview.org/t/problem-with-mpi-comm-in-paraview-5-10-0-rc1-when-using-external-mpi-version/8222/24 "2021-10-26T13:33:48Z")
Here is what I found: [https://gitlab.kitware.com/vtk/vtk/-/merge\_requests/8565](https://gitlab.kitware.com/vtk/vtk/-/merge_requests/8565)
Hrm. That’s a lot of changes. Something went wonky with another ioss update…tracking it down.
---
### Author:  [@joeh](https://discourse.paraview.org/u/joeh)
#### Post date: [December 1, 2021, 7:33pm UTC](https://discourse.paraview.org/t/problem-with-mpi-comm-in-paraview-5-10-0-rc1-when-using-external-mpi-version/8222/25 "2021-12-01T19:33:35Z")
Ben,
I have found that the issue is still present in ParaView 5.10.0-RC2
Thanks,
Joe
---
### Author:  [@Trophime](https://discourse.paraview.org/u/Trophime)
#### Post date: [December 14, 2021, 12:32pm UTC](https://discourse.paraview.org/t/problem-with-mpi-comm-in-paraview-5-10-0-rc1-when-using-external-mpi-version/8222/26 "2021-12-14T12:32:24Z")
Any news on this issue?
---
### Author:  [@ben.boeckel](https://discourse.paraview.org/u/ben.boeckel)
#### Post date: [May 15, 2022, 7:35pm UTC](https://discourse.paraview.org/t/problem-with-mpi-comm-in-paraview-5-10-0-rc1-when-using-external-mpi-version/8222/27 "2022-05-15T19:35:02Z")
I believe that 5.11 should have this fixed. I seem to remember fixing `MPI_Comm` “no MPI” stuff since.
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