Hello Praveer, glad to see that you could make it work in the end.
Yours, Roland > Dear Dr. Roland, > > Thank you for your detailed response. I really appreciate the time and > thought you must've put into it. > > I have followed your suggestion of removing the current Cactus build and > compiling it again but received yet another error. The problem seems to be > a mixup of multiple MPI implementations, just as you had suggested. I > couldn't finesse my way out of it, so I re-installed Ubuntu > instead(deleting everything in the process) and began from scratch. I > installed only those packages mentioned on the Jupyter tutorial and the > code compiled successfully this time. > > Thank you once again for your helpful advice. > > Regards, > Praveer Krishna > > On Fri, Mar 27, 2020 at 8:42 PM Roland Haas <[email protected]> wrote: > > > Hello Praveer Krishna, > > > > since mpirun was not found initially it would seem that you had not MPI > > stack installed when compiling Cactus. > > > > Cactus is best used with an MPI stack installed beforehand. The new > > user tutorial > > > > > > https://nbviewer.jupyter.org/github/nds-org/jupyter-et/blob/master/CactusTutorial.ipynb > > > > contains instructions on how to install a set up packages that simplify > > building Cactus, including MPI. Did you follow those instructions or > > started from a vanilla, freshly installed OS? Also, what OS are you > > using (OSX, Linux, Linux-Subsystem-on-Windows)? > > > > The easiest way to get a working copy of Cactus, if you did not install > > an MPI stack before compiling Cactus, is: > > > > * install an MPI stack (OpenMPI is fine) > > * remove the current Cactus build using "rm -rf configs/sim" > > * build once more > > > > The solution above is the suggested solution. > > > > If you would like to avoid recompiling (and risk triggering other > > issues instead), here's an alternative: When it detected that no MPI > > stack was installed then Cactus built its own copy of OpenMPI. It will > > have copied "mpirun" to "exe/sim/mpirun" and you can use that by making > > sure that the full path to the directory "exe/sim" appears in your PATH > > before you start the simulation. Using an mpirun from a different MPI > > stack than the one used to compile Cactus is what gives the error that > > Erik descibes in the email you found. > > > > Yours, > > Roland > > > > > Dear ET Users, > > > > > > I'm a beginner attempting to follow the Jupyter tutorial for new users. I > > > have been able to successfully run the helloworld.par and tov_ET.par > > files > > > with procs set to 1 but I'm having issues when I try to use multiple > > > processors on my laptop. > > > I initially got this error <https://imgur.com/a/cuLLp79> saying "mpirun: > > > not found", following which I installed Open MPI on my system. The error > > > persisted, so I removed Open MPI and installed mpich instead. This > > > seemingly fixed the issue, but I received another error > > > <https://imgur.com/gdXSqCj> saying "CACTUS_NUM_PROCS is set to 4 but > > there > > > are 1 MPI processes" > > > > > > I found one > > > < > > https://www.mail-archive.com/[email protected]&q=subject:%22%5C%5BUsers%5C%5D+problem+on+running+bbh+expample%22&o=newest&f=1 > > > > > > > > or two > > > <https://www.mail-archive.com/[email protected]/msg01591.html> > > > previous queries regarding this exact error, but the suggestions have not > > > worked for me so far. Having never worked with MPI before, I am not sure > > > what else I should try. > > > > > > I'd be grateful for a few words of advice on this issue from anyone in > > the > > > community. > > > Thank you in advance for your time. > > > > > > Regards, > > > Praveer Krishna > > > > > > -- > > My email is as private as my paper mail. I therefore support encrypting > > and signing email messages. Get my PGP key from http://pgp.mit.edu . > > -- My email is as private as my paper mail. I therefore support encrypting and signing email messages. Get my PGP key from http://pgp.mit.edu .
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