<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On May 8, 2020, at 1:41 AM, Martin Ivanov <<a href="mailto:marto1980@gmail.com" class="">marto1980@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class="">Hello,<div class="">Thank you for your replies. I think another version of MPICH may not work as I am following a tutorial (<a href="https://www2.mmm.ucar.edu/wrf/OnLineTutorial/compilation_tutorial.php" class="">https://www2.mmm.ucar.edu/wrf/OnLineTutorial/compilation_tutorial.php</a>) that requires specific library versions.</div><div class="">My /etc/hosts file contains only these two lines:</div><div class=""><br class=""></div><div class="">"</div><div class="">::1 localhost localhost.my.domain<br class="">127.0.0.1 localhost localhost.my.domain<br class=""></div><div class="">"</div><div class=""><br class=""></div><div class="">uname -n returns an empty string as I have not set a hostname. I guess I do not need this because I need to run MPICH only on this machine, that is on localhost? uname -a gives the following output:</div><div class=""><br class=""></div></div></div></blockquote><div><br class=""></div><div>Thing is, though, your initial post showed ssh being used as launcher. So in that case you would definitely need a hostname so you can resolve back to yourself (your shell prompt was a big clue, by the way). Setting a hostname and making it an alias of localhost in /etc/hosts would probably do wonders no matter the underlying launch.</div><div><br class=""></div><div>The -info output is pretty much the same as I see on FreeBSD.</div><div><br class=""></div><div>If you run a hello world with a sleep in it to allow you to react, what does “ps x” show?</div><br class=""></div><div>(Not familiar much with DragonFly beyond “poking at it” so I don’t have any particular insight there.)</div><div><br class=""></div><div>Tony</div><div><br class=""></div><br class=""></body></html>