Draft at NVIDIA cuDSS (GPU sparse linear solver) integration in Ipopt.#849

Draft

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Commits on Oct 19, 2025

Started working on cuDSS Sparse Solver Interface. Started adding solver options (not finished yet). Will need to modify also the configure and makefile
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Finished writing user modifiable solver options for cuDSS solver.
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Commits on Oct 21, 2025

Started working on Initialize Structure and creating all the required cuDSS handles, config, data, etc... to actually call the factor/solve functions.
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Commits on Oct 22, 2025

Finished InitializeImpl and InitializeStructure. Later will have to recheck to be sure that everything is ok. Now trying to play with configure scripts to understand how to link correct libraries a…
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Commits on Oct 24, 2025

Updated configuration files to compile Ipopt with cuDSS. First try.
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Commits on Oct 25, 2025

Commits on Oct 26, 2025

Updated cuDSS interface with necessary functions for Ipopt. Updated IpCuDSS linear solver.
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Commits on Oct 28, 2025

Commits on Oct 29, 2025

Updated interfaces. Still to solve 2nd call to ipopt solver (re-solve) - cudss fails with error CUDSS_STATUS_ALLOC_FAILED (due to pointers being reallocated but not freed before ipopt 2nd restart?).
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Commits on Oct 31, 2025

Added error checking on cuDSS solver options as explained in https://docs.nvidia.com/cuda/cudss/types.html
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Commits on Nov 4, 2025

Commits on Nov 5, 2025

Resolved CUDA allocation error when attempting multiple IpoptSolve calls with same problem. Compiled and tested with IPOPT_SINGLE option.
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