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README.md

@ -11,3 +11,48 @@ Instances of Ubuntu Linux with [MPICH](https://www.mpich.org) -- portable implem
[inspired by NLKNguyen](https://github.com/NLKNguyen/alpine-mpich)
## Quickstart
This is a quickstart guide of how you can typically use this *LabInstance to deploy MPI programs*
- Working Directory
> /project
- Default user for MPI
> mpi
- The host file that contains addresses of connected workers can created with:
> IP_ADDR=$(ip addr show | grep "inet " | grep "eth0" | awk '{print $2}')
> nmap -sP $IP_ADDR | grep ondemand_mpi_worker | awk -F "[()]" '{ for (i=2; i<NF; i+=2) print $i }' > /project/hosts
- Compile
> mpicc -o /project/mpi_hello_world examples/mpi_hello_world.c
- run the MPI hello world program
sudo -u mpi mpirun -n 10 -f /project/hosts /project/mpi_hello_world
<div class="panel panel-info">
**Note**
{: .panel-heading}
<div class="panel-body">
```bash
# scp hello wrold to all clients. sudo -u mpi for auto scp connect. see /home/mpi/.ssh
while read -r line;
do
sudo -u mpi scp /project/mpi_hello_world mpi@$line:/project/mpi_hello_world
done < /project/hosts
```
</div>
</div>

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