ompi-probe: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/ompi-probe - from package: openmpi-bin

You may install the required package with command apt-get install {package}

Error in other languages:
ompi-probe: bevel nie gevind nie
ompi-probe: comandă negăsită
ompi-probe: comando não encontrado
ompi-probe: commande introuvable
ompi-probe: command not found
ompi-probe: käsku ei ole
ompi-probe: không tìm thấy lệnh
ompi-probe: komanda nerasta
ompi-probe: Kommando nicht gefunden.
ompi-probe: kommandot finns inte
ompi-probe: komut yok
ompi-probe: nie znaleziono polecenia
ompi-probe: níor aimsíodh an t-ordú
ompi-probe: no se encontró la orden
ompi-probe: no s'ha trobat l'ordre
ompi-probe: opdracht niet gevonden
ompi-probe: parancs nem található
ompi-probe: perintah tidak ditemukan
ompi-probe: príkaz nenájdený
ompi-probe: příkaz nenalezen
ompi-probe: команда не найдена
ompi-probe: командата не е открита
ompi-probe: 命令找不到
ompi-probe: コマンドが見つかりません