smTestDriver_mpich: command not found

Have You tried accessing the binary with the full path?

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

[root@server ~]# echo $PATH

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 CentOS possible default full paths are:

/usr/lib64/mpich/bin/smTestDriver_mpich - from package: paraview-mpich

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