Hi, I am using mpich on a hadoop cluster with yarn. It is not a smooth integration but it is working. Flowing an old post, I am using the manual launcher and the option -disable-hostname-propagation (https://lists.mpich.org/mailman/htdig/devel/2016-July/000717.html) The command line to launch by binary is : mpiexec -launcher manual -disable-hostname-propagation -n 6 -f ./hosts /path/to/my/bin And the file hosts contains host1:2 host2:2 host3:2 I expect to have 2 processes on each host but most of the time it launches 3 processes on host1, 1 on host2 and 2 on host3 Any ideas? Bruno _________________________________________________________________________________________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confidentielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages electroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou falsifie. Merci. This message and its attachments may contain confidential or privileged information that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and delete this message and its attachments. As emails may be altered, Orange is not liable for messages that have been modified, changed or falsified. Thank you.