doc: add docs about using MPI in docker. (#4060)

* add docs. * Update docs/community/faq.md Co-authored-by: Chun Cai <amoycaic@gmail.com> * Update docs/community/faq.md Co-authored-by: Chun Cai <amoycaic@gmail.com> --------- Co-authored-by: Chun Cai <amoycaic@gmail.com>
abacusmodeling · Apr 27, 2024 · f372175 · f372175
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diff --git a/docs/community/faq.md b/docs/community/faq.md
@@ -80,6 +80,8 @@ If the program prompt something like "KILLED BY SIGNAL: 9 (Killed)", it may be c
 
 If the error message is "Segmentation fault", or there is no enough information on the error, please feel free to submit an issue.
 
+**4. Error "Read -1" when using mpirun in docker environment**
+This is a [known issue](https://github.com/open-mpi/ompi/issues/4948) of OpenMPI running in a docker container. In this case, please set environment variable `OMPI_MCA_btl_vader_single_copy_mechanism=none`.
 ## Miscellaneous
 
 **1. How to visualize charge density file?**