# Large Mesh Error PETSc Error 76 - Adjoint Calculation

**URL:** <https://fenicsproject.discourse.group/t/large-mesh-error-petsc-error-76-adjoint-calculation/422>\
**Category:** dolfin-adjoint\
**Created:** [March 22, 2019, 6:51pm UTC](https://fenicsproject.discourse.group/t/large-mesh-error-petsc-error-76-adjoint-calculation/422 "2019-03-22T18:51:47Z")\
**Posts on this page:** 1\
**Showing post:** 22

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**Author:** ![dokken](https://yyz2.discourse-cdn.com/free1/user_avatar/fenicsproject.discourse.group/dokken/32/1560_2.png) [@dokken](https://fenicsproject.discourse.group/u/dokken)\
**Post date:** [August 28, 2020, 2:17pm UTC](https://fenicsproject.discourse.group/t/large-mesh-error-petsc-error-76-adjoint-calculation/422/22 "2020-08-28T14:17:28Z")

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@phurisja, The UMFPACK limitation is probably related to: [UMFPACK error: out of memory despite system having free memory](https://fenicsproject.discourse.group/t/umfpack-error-out-of-memory-despite-system-having-free-memory/984/2).

There is indeed an issue in dolfin-adjoint related to `ident_zeros`, see: [https://github.com/dolfin-adjoint/pyadjoint/pull/29](https://github.com/dolfin-adjoint/pyadjoint/pull/29)  
This will hopefully be merged today, as I have to make some tests.

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