#1911: Hydro_InitExcision sphere_pugh_ppm test fails ----------------------------+----------------------------------------------- Reporter: barry.wardell | Owner: Type: defect | Status: reopened Priority: unset | Milestone: Component: Other | Version: development version Resolution: | Keywords: ----------------------------+-----------------------------------------------
Comment (by knarf):
Non concerning nans: the absolute differences in the velocity here are larger than 10e-7. This is usually considered too large for double- precision hydro simulations. Only looking at the Cactus-diff-output I cannot judge why that is, but I suspect these values are supposed to be zero, or close to it, but -ffast-math seems to produce a considerably larger error. This is a problem.
I don't think we are likely to find a workaround for this in time for the release (code that works better even with fast math). I would suggest to remove --fast-math from the Ubuntu option list for the time being.