# Issue with solver=UMFPACK64

**URL:** <https://community.freefem.org/t/issue-with-solver-umfpack64/2467>\
**Category:** General Discussion\
**Created:** [May 17, 2023, 11:19am UTC](https://community.freefem.org/t/issue-with-solver-umfpack64/2467 "2023-05-17T11:19:25Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![89273166](https://avatars.discourse-cdn.com/v4/letter/8/f475e1/32.png) [@89273166](https://community.freefem.org/u/89273166)\
**Post date:** [May 17, 2023, 11:19am UTC](https://community.freefem.org/t/issue-with-solver-umfpack64/2467/1 "2023-05-17T11:19:25Z")

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In which version of FreeFem++, we can use "UMFPACK64 " as a solver.

Thank you in advanced.

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**Author:** ![aszaboa](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.freefem.org/aszaboa/32/2918_2.png) [@aszaboa](https://community.freefem.org/u/aszaboa)\
**Post date:** [May 18, 2023, 11:16am UTC](https://community.freefem.org/t/issue-with-solver-umfpack64/2467/2 "2023-05-18T11:16:00Z")

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I think that though using PETSc you can access UMFPACK. I am not sure about otherwise (I mean by using the `problem` keyword).

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**Author:** ![89273166](https://avatars.discourse-cdn.com/v4/letter/8/f475e1/32.png) [@89273166](https://community.freefem.org/u/89273166)\
**Post date:** [May 18, 2023, 12:51pm UTC](https://community.freefem.org/t/issue-with-solver-umfpack64/2467/3 "2023-05-18T12:51:38Z")

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Thank you for your reply.

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**Author:** ![cmd](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.freefem.org/cmd/32/67_2.png) [@cmd](https://community.freefem.org/u/cmd)\
**Post date:** [May 18, 2023, 4:24pm UTC](https://community.freefem.org/t/issue-with-solver-umfpack64/2467/4 "2023-05-18T16:24:32Z")

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I think you can also use it without petsc if you use `load “UMFPACK64”`.