Hello Benjamin and Marco, thank you for your fast answers. Now everything is clear, except my last question. If I run for example the HelloWholeWorld program is seems to work properly. Actually it's no problem, I was just curious. :)
bye Zitat von Benjamin Herta <bhe...@us.ibm.com>: > Hi Michael - I'll be happy to answer your questions. > > 1) If you have more places than hosts, then yes, you'll end up with > multiple places on one or more hosts. It assigns place 0 on the first > host, place 1 on the second, etc. When it runs out of hosts, it starts > over again. For example, if you have 2 hosts, but nplaces=5, it will put > places 0,2,4 on host 1, and places 1,3 on host 2. > > 2) You assign each place to each host using X10_HOSTFILE of X10_HOSTLIST at > startup time. There is no simple way to get the hostname at runtime > currently. > > 3) X10_NTHREADS defines how many cores should be used by the X10 runtime. > If you have 4 cores, and you want to dedicate all 4 to running a single X10 > place, then set X10_NTHREADS to 4. If you have 2 places on the machine, > you would want to divide it in half, setting X10_NTHREADS=2 for each place. > > 4) X10 assumes you are giving it a valid set of hostnames at initial > startup. If you provide an invalid hostname in X10_HOSTLIST, the launcher > will still attempt to launch a place on that host. Your main program won't > begin running until all places are up and connected, so it shouldn't begin > running at all. > > > - Ben > > > > From: Michael Dietrich <michael.dietr...@s2010.tu-chemnitz.de> > To: x10-users@lists.sourceforge.net > Date: 08/27/2014 11:34 AM > Subject: [X10-users] Some questions about places > > > > Hello, > > I am using X10 as a part of my bachelor's thesis about high > performance programming languages (so maybe some more questions may be > asked later :-) ). > > My first questions are about using several places: > > * If I set X10_NPLACES=n with having less than n hosts, the places > will be distributed among the existing hosts, right? > > * Is there a possibility to find out which place is located on which > host? In Chapel you have here.name. > > * Should X10_NTHREADS be equal to the amount of cores within a host? > > * Let there be X10_HOSTLIST="A,B,foo". A and B are the hosts I want to > use while foo is a randomly chosen set of letters for simulating a > mistyped or currently inactive computer. > If I start a program with this parameter I don't get an error message > though there is something wrong. If I do isDead() on every place every > of them returns false. > Did I maybe forget to set something so it doesn't distribute the > places to other computers or does X10 ignore host names which cannot > be reached? > > Thank you very much > bye > > > ------------------------------------------------------------------------------ > > Slashdot TV. > Video for Nerds. Stuff that matters. > http://tv.slashdot.org/ > _______________________________________________ > X10-users mailing list > X10-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/x10-users ------------------------------------------------------------------------------ Slashdot TV. Video for Nerds. Stuff that matters. http://tv.slashdot.org/ _______________________________________________ X10-users mailing list X10-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/x10-users
