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library:computing:xios_impi_troubles [2017/08/04 15:16] 84.88.184.232 [Issue 4:] |
library:computing:xios_impi_troubles [2024/05/22 04:09] 84.88.52.107 old revision restored (2017/08/11 11:11) |
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- | ====== NEMO-XIOS | + | ====== NEMO-XIOS Intel MPI issues |
===== NEMO-XIOS @ MN3 ===== | ===== NEMO-XIOS @ MN3 ===== | ||
- | **Environment: | + | **Environment: |
* Intel 13.0.1 & Intel MPI 4.1.3.049 | * Intel 13.0.1 & Intel MPI 4.1.3.049 | ||
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**Diagnosis: | **Diagnosis: | ||
- | **Solution: | + | **Solution: |
**More information: | **More information: | ||
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- | **Actions taken:** Given that the error is a floating invalid we disabled the -fpe0 flag, but we still were having the same problem. Then we disabled compiler optimizations (use -O0) and the problem disappeared, | + | **Actions taken:** Given that the error is a floating invalid we disabled the -fpe0 flag, but we still were having the same problem. Then we disabled compiler optimizations (use -O0) and the problem disappeared, |
- | **Diagnosis:** | + | Update: Using the new NetCDF 4.2 installed by Ops and key netcdf_par for XIOS2 the model can run using O3. We have to investigate further this issue. |
- | **Solution: | + | **Diagnosis: |
+ | |||
+ | **Solution: | ||
==== Issue 3: MPI kills XIOS when writing model output ==== | ==== Issue 3: MPI kills XIOS when writing model output ==== | ||
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We tried an alternative solution, which was to __increment the number of XIOS servers__ in order to reduce the number of messages sent to the same process and by the moment it seems that it is effective. | We tried an alternative solution, which was to __increment the number of XIOS servers__ in order to reduce the number of messages sent to the same process and by the moment it seems that it is effective. | ||
- | **Diagnosis: | + | **Diagnosis: |
**Solution: | **Solution: | ||
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**Problem: | **Problem: | ||
- | **Actions taken:** | + | **Actions taken: |
**Diagnosis: | **Diagnosis: | ||
- | **Solution: | + | **Solution: |