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madgraph5 / madgraph4gpu

GPU development for the Madgraph5_aMC@NLO event generator software package
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Cross section mismatch in pp_tt012j (P2_gu_ttxgu) in CI tmad tests #872

Open valassi opened 1 week ago

valassi commented 1 week ago

There is a cross section mismatch in pp_tt012j in CI tmad tests.

This only appears after fixing the rotxxx crash (which otherwise hides it). I have seen this in the CI for PR #857, where volatile is added to fix rotxxx. https://github.com/madgraph5/madgraph4gpu/actions/runs/9694817881/job/26753418805

*** (2-none) Compare MADEVENT_CPP xQUICK xsec to MADEVENT_FORTRAN xsec ***

ERROR! xsec from fortran (0.82047507505698292) and cpp (0.67821465194602271) differ by more than 3E-13 (0.1733878669026967)

image

valassi commented 1 week ago

I forgot to mention: the CI now runs tmad tests in each P* subprocess. The issue appears in P2_gu_ttxgu. (Other subprocesses succeed).