Does it support the output of L U matrix to a file?

[ztdepztdep]

I want to transfer the L and U matrix to the gpu , does superlu support the output of L and U matrix to a file?

[liuyangzhuan]

I'm not sure how do you plan to use the L and U. If you want to work with CSR or triplet formats:

1. You can output the L factor to a file with the triplet format by using
   https://github.com/xiaoyeli/superlu_dist/blob/324d65fced6ce8abf0eb900223cba0207d538db7/SRC/dutil_dist.c#L675
   but use line 755 instead of line 753.
2. You can convert the L factor to CSR or triplet using https://github.com/xiaoyeli/superlu_dist/blob/324d65fced6ce8abf0eb900223cba0207d538db7/SRC/dutil_dist.c#L815
   https://github.com/xiaoyeli/superlu_dist/blob/324d65fced6ce8abf0eb900223cba0207d538db7/SRC/dutil_dist.c#L1075
   but need to make sure you only use 1 MPI to call superlu_dist
3. You can modify
   https://github.com/xiaoyeli/superlu_dist/blob/324d65fced6ce8abf0eb900223cba0207d538db7/SRC/dutil_dist.c#L1229
   to generate CSR/triplet for the U factor as well.

If you can work with the supernodal representation, they can already accessed from GPU, for example using
https://github.com/xiaoyeli/superlu_dist/blob/324d65fced6ce8abf0eb900223cba0207d538db7/SRC/pdgssvx.c#L1894
https://github.com/xiaoyeli/superlu_dist/blob/324d65fced6ce8abf0eb900223cba0207d538db7/SRC/pdgssvx.c#L1448