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                Dear Gromacs developers,
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                         Based on Gromacs-2020.2, we've done a series of development related to FEP in following aspects . We would like to contribute our codes to Gromacs and we're looking forward to hearing your opinions first.
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                         High-performance implementations:
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                         1. Offload FEP-PME to GPU. Our status: finished. We've also noticed that this function has been implemented in commit f7be07e3cc901eb03700d93248fc09b573370282 by M. Lundborg et. al. and has been merged in Gromacs-2021. So we won't commit this.
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                         2. Offload non-bonded free energy kernel to GPU. Our status: finished.
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                         3. Offload bonded free energy kernel to GPU. Our status: finished.
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                         4. Support GPU updates for FEP. Our status: finished md-integrator. We've noticed that this has also been implemented in Gromacs-2021, but we'are still interested in supporting GPU updates of sd-integrator. Similar discussion can be found in issue #3258 on gitlab.
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                         5. Support GPU replica exchange. Our status: finished.
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                         New features:
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                         1. Support "Soft Bond Potential" in FEP, which is proposed in DOI: 10.1021/acs.jctc.6b00991 and allows a more smooth change of bond topology when there is bond formation or breaking in a FEP transformation, such as 5-member ring to 6-member ring. Our status: finished.
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                         2. Split softcore parameters for VDW and Coulomb interactions. We noticed that currently Gromacs supports only one parameter "sc-alpha" to modify soft-core interactions. After our tests, this will cause a phase-transition-like phenomenon at middle lambdas in some cases. Our status: finished. We also noticed recently there have been some new forms of softcores like gapsys softcore (DOI: dx.doi.org/10.1021/ct300220p and discussed in <a href="https://gitlab.com/gromacs/gromacs/-/merge_requests/882" target="_blank">https://gitlab.com/gromacs/gromacs/-/merge_requests/882</a> ) and Amber SSC2 softcore (DOI: 10.1021/acs.jctc.0c00237.) And we would like to ask if you consider it's necessary to support such new softcore potentials.
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                         These terms are all that we want to contribute to Gromacs. But we have to admit that there is still a lot of work to test and standardize our codes to meet all requirements of Gromacs. Is there any suggestion?
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                         Best wishes!
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                         Happy Simulating!<br>
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                         Yuzhi & Junhan
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