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Apparently, this line of code: " float inv_ds = rsqrt(ds2 + EPS2) * (__float_as_int(pos_i.w.y) != __float_as_int(pos_j.w.y)); " which should result in "inv_ds==0" for "i==j" results in "inv_ds==NaN" for "i==j" for modern CUDA versions. We suspect that for older CUDA versions this worked well and resulted in "inv_ds==0" for "i==j", i.e. for fictious self-gravitation - which we exclude, of course. Most likely, older CUDA versions did not comply with IEEE 754.
See https://developer.download.nvidia.com/compute/DevZone/docs/html/C/doc/html/group__CUDART__THREAD__DEPRECATED_gf423ba04af587d42b52799455a7c094d.html: "cudaThreadExit" has been deprecated: " Note that this function is deprecated because its name does not reflect its behavior. Its functionality is identical to the non-deprecated function cudaDeviceReset(), which should be used instead. "
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I can confirm that this branch not only compiles with CUDA 13, i.e. that this fixes #1193, but also runs with CUDA 13. |
HannoSpreeuw
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kind: bug
kind: update
ErwanH29
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Dec 19, 2025
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Tested the code on the AMUSE script sun_venus.py and it gives near identical results to the CPU mode of Ph4 in both solutions and energy conservation. I compiled and tested using CUDA 13.
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Checked by Erwan, and considered ok. |
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Solves #1195
The problem was with this line:
This caused
inv_ds==NaN.Solves #1193