# Question about Eigen and GPUSPH spheric 2022

**URL:** <https://gpusph.discourse.group/t/question-about-eigen-and-gpusph-spheric-2022/174>\
**Category:** Uncategorized\
**Created:** [August 8, 2022, 10:05am UTC](https://gpusph.discourse.group/t/question-about-eigen-and-gpusph-spheric-2022/174 "2022-08-08T10:05:00Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![ColarJohn](https://avatars.discourse-cdn.com/v4/letter/c/848f3c/32.png) [@ColarJohn](https://gpusph.discourse.group/u/ColarJohn)\
**Post date:** [August 8, 2022, 10:05am UTC](https://gpusph.discourse.group/t/question-about-eigen-and-gpusph-spheric-2022/174/1 "2022-08-08T10:05:00Z")

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Dear GPUSPH development team  
When I try to run GPUSPH(spheric 2022), the test cases about FEA can not work. But the other cases can work very well.

 ![1659952941325](https://global.discourse-cdn.com/free1/uploads/gpusph/original/1X/ec71b806be7c5cde0fcb7dc2f74bf70641a31fd2.jpeg)  
The operating system: Ubuntu 20.04  
GPU card: Tesla A100  
Eigen 3.4.0  
Could you give me some suggestions on solving the problem? It would be a great help and I would really appreciate it. Thank you very much and I am looking forward to hearing from you.  
Best regards.  
ColarJohn

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<div class="post-metadata">

**Author:** ![giuseppe.bilotta](https://yyz2.discourse-cdn.com/free1/user_avatar/gpusph.discourse.group/giuseppe.bilotta/32/72_2.png) [@giuseppe.bilotta](https://gpusph.discourse.group/u/giuseppe.bilotta)\
**Post date:** [August 8, 2022, 9:04pm UTC](https://gpusph.discourse.group/t/question-about-eigen-and-gpusph-spheric-2022/174/2 "2022-08-08T21:04:22Z")

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Hello @ColarJohn, can you try adding

```
CXXFLAGS += -march=native

```

to your `Makefile.local`? (create the file if it does not exist)

Do a `make clean` afterwards, to make sure all of GPUSPH is rebuilt with the new flag.