starpu_top: 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/starpu_top - from package: starpu-top

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

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