hwloc-gather-topology: 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 CentOS possible default full paths are:

/usr/bin/hwloc-gather-topology - from package: hwloc

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/hwloc-gather-topology - from package: hwloc-nox
/usr/bin/hwloc-gather-topology - from package: hwloc

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

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