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Hello again,</div>
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Following up on this topic, what I got from the core dump information is</div>
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(gdb) backtrace</div>
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#0 0x00001534138194ea in __memcmp_avx2_movbe () from /lib64/libc.so.6</div>
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#1 0x00001534143fed66 in _F90_STRING_COMPARE () from /opt/cray/pe/cce/15.0.0/cce/x86_64/lib/libfi.so.1</div>
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#2 0x0000000000519160 in ctrl_map_genarr2d_ad_ ()</div>
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#3 0x000000000050a0c0 in ctrl_map_ini_genarr_ad_ ()</div>
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#4 0x0000000000505f4e in ctrl_init_variables_ad_ ()</div>
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#5 0x000000000068c28f in packages_init_variables_ad_ ()</div>
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#6 0x000000000042ca7f in initialise_varia_ad_ ()</div>
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#7 0x000000000041e819 in adthe_main_loop_ ()</div>
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#8 0x0000000000a2c513 in the_model_main_ ()</div>
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#9 0x0000000000978fd0 in main_ ()</div>
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and STDOUT stops at this point (stops at the same point every time I run the model).</div>
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...</div>
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(PID.TID 0000.0001) MDS_READ_FIELD: opening global file: adxx_tauu.0000000000.data</div>
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(PID.TID 0000.0001) MDS_WRITE_FIELD: it,rec,kS,kL,kH= 0 -42 15 1 1 file=adxx_tauu.0000000000</div>
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(PID.TID 0000.0001) MDS_READ_FIELD: opening global file: adxx_tauu.effective.00000000</div>
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I think it is related to data access issues but still not sure why it runs successfully from time to time.</div>
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I am not sure if this is related but, in this configuration, I don't provide 2d or 3d control files in advance (i.e. xx_tauu.*data, meta etc.)</div>
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since I heard this will be generated during the run (and okay for adjoint sensitivity experiments, please correct me if I am wrong).</div>
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Thank you again in advance, please let me know if you have thoughts (or encountered similar issues before).</div>
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Best regards,</div>
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Yohei</div>
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<div id="divRplyFwdMsg" dir="ltr"><span style="font-family: Calibri, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);"><b>From:</b> MITgcm-support <mitgcm-support-bounces@mitgcm.org> on behalf of Yohei Takano - BAS <yokano@bas.ac.uk><br>
<b>Sent:</b> 07 May 2024 12:24<br>
<b>To:</b> mitgcm-support@mitgcm.org <mitgcm-support@mitgcm.org><br>
<b>Subject:</b> [MITgcm-support] Segmentation Fault in MITgcm Adjoint Simulations</span>
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Hello all,</div>
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My colleague and I have been working on adjoint sensitivity setup & simulations</div>
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based on global coarse resolution biogeochemistry model (<a href="https://github.com/MITgcm/MITgcm/tree/master/verification/tutorial_global_oce_biogeo" id="OWA553ecee9-06b5-96d0-656b-7f16d45fa3b2" class="OWAAutoLink" data-auth="NotApplicable" data-loopstyle="linkonly">https://github.com/MITgcm/MITgcm/tree/master/verification/tutorial_global_oce_biogeo</a>),</div>
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similar configurations but we have our own customization.</div>
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We manage to compile the model and run adjoint test simulations. However, the model crashes</div>
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(with segmentation fault) towards the end of adjoint simulations and we would like your advice to</div>
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figure out why this is happening. The strange part is that we manage to successfully run at one point</div>
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but when try to reproduce with the exact same setting (on the same HPC) it starts to crash again...</div>
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Roughly speaking 1 out of 5 times it runs successfully but most of the time crashes at the same point.</div>
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We are puzzled because we are using the exact same settings/executable every time and wondering what causes</div>
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this unstable situation. The environment should be the same everytime we run the model.</div>
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Does anyone have similar experiences? Here is the code/configuration I have been working on with my colleague Dani Jones.</div>
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<a href="https://github.com/ytakano3/MITgcm_BGC_Model_Config" id="OWAc959f19a-3c67-2bae-022c-0894992b010c" class="x_OWAAutoLink" data-auth="NotApplicable" data-linkindex="0" data-loopstyle="linkonly" style="margin: 0px;">https://github.com/ytakano3/MITgcm_BGC_Model_Config</a></div>
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In "global_ocn3deg_bgcv0" you see "code_ad" and "input_ad/input_ad_kpp_atmco2pv0" and you can compile</div>
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(with TAF) and run the model. It is 2 years test run. When I am trying this, it fails (i.e. segmentation fault) most of the time but </div>
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again say 1 in 5 times the model runs successfully... We would like to figure out why this is happening, why it gets unstable so </div>
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let me know if you have thoughts on this.</div>
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Sorry about the long e-mail but please let me know if anything is unclear. Thank you in advance.</div>
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Regards,</div>
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Yohei</div>
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