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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="LPlnk">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" target="_blank" id="OWA9909b6f4-e03b-8e5c-0759-3a6dedf040ec" class="OWAAutoLink" rel="noopener noreferrer" 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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