Hello, i did a fresh install of 3.0.4. on a linux laptop and since i dont have much experience i followed the installation readme on the tar file and everything went well expect the part when i test the installation. The first test run : mpiexec -n <number> ./examples/cpi , went as planned but then the second test run on multiple nodes (mpiexec -f machinefile -n <number> ./examples/cpi) returned some errors. As the readme states there should be a machinefile. The thing is i cant find this file and tried to create it my self in the given form, just using only my laptops hostname a couple of times and placing it in the mpich installation directory ( /home/<username>/mpich-install) and that didnt fix the errors. One other thing i noticed is that on the readme states that hydra is the primary process manager, but using the mpiexec -info it clearly states that pmi ( or something similar ) is the primary pm. And for a last thing my installation was made without using any prefixes at the configuration. PS.One other thing i just noticed is that when i did the installation i could run mpich ( the test runs with the pi programm, mpiexec -info , etc) , but now after a reboot i cant run mpich on the terminal. For example *mpiexec -info* returns *_bash: mpiexec: command not found_* . Whats the deal with that? Didnt i installed mpich on my machine? Thank you for your time.