search

JohannesBuchner / PyMultiNest

Pythonic Bayesian inference and visualization for the MultiNest Nested Sampling Algorithm and PyCuba's cubature algorithms.
http://johannesbuchner.github.io/PyMultiNest/
Other
191 stars 87 forks source link

Odd values in the chain file (.txt file) #212

Closed Andrei-EPFL closed 2 years ago

Andrei-EPFL commented 2 years ago

Hello, I am running PyMultinest in parallel on a cluster using 8 nodes and 8 tasks per node, thus 64 tasks in total. Moreover each tasks is using 8 threads (OpenMP) to compute some curves.

I ran the code on an interactive node for even more tasks and I got reasonable results in the chain file, however when I launch it normally on the batch, the column of the chi2 in the chain file contains only this value "-0.592878775009495853-322". The "ev.dat" file has normal values. Moreover, I print at each step the value of the chi2, so I have it in the standard output. None of the values of the chi2 are equal to something odd (like -0.592878775009495853-322). I am not sure if it is a problem of the parallelization, the cluster or a bug of mine.

Did anyone has observed this behaviour or this number?

I am working on NERSC cluster.

Thank you very much! Kind regards, Andrei

JohannesBuchner commented 2 years ago

That's a fortran "feature", and unrelated to the parallelisation.