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Dr. Fortran Steve Lionel told me the following:

If the VASP validation test is looking for an exact FP value, that’s its error. If it accepts a small variation, perhaps the range needs to be widened a bit to accommodate more advanced vectorizations.

So I want to know the tolerance used by the testsuite, and wonder if the tolerance range needs to be widened a bit to accommodate more advanced vectorizations, say, AVX512 and similar scenarios.

Regards,
HZ

One has to be very cautious when widening the tolerance for the testsuite. Test suites should be as "universal" as possible so it's often better to tweak the parameters and make the affected examples more "stable".

All the tolerances are set in testsuite/runtest.