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You are right. I was not clearing the caches when the section was reset. Stefano ahs fixed this now: https: //gitlab. com/petsc/petsc/-/merge_requests/7314 Thanks, Matt On Thu, Feb 22, 2024 at 4: 24 AM Stefano Zampini <stefano. zampini@ gmail. com>
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<div dir="ltr">You are right. I was not clearing the caches when the section was reset. Stefano ahs fixed this now:<div><br></div><div> <a href="https://urldefense.us/v3/__https://gitlab.com/petsc/petsc/-/merge_requests/7314__;!!G_uCfscf7eWS!ZPkq_k9vdzTZxeW53aWVTIcDgeGnywSm0tGKDJkJqdwgTomfYjw1lsTMyRtAjtruSslcgLIoKGg7IILlBxbJ$">https://gitlab.com/petsc/petsc/-/merge_requests/7314</a></div><div><br></div><div> Thanks,</div><div><br></div><div> Matt</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Feb 22, 2024 at 4:24 AM Stefano Zampini <<a href="mailto:stefano.zampini@gmail.com">stefano.zampini@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>I guess we are missing to clear the internal scratch vectors, matt can confirm</div><div><br></div><div>Can you please add this call AFTER you set the local section to confirm?<br></div><div><br></div><div> call DMClearLocalVectors(dm_mesh, ierr);</div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Il giorno gio 22 feb 2024 alle ore 11:36 袁煕 <<a href="mailto:yuanxi@advancesoft.jp" target="_blank">yuanxi@advancesoft.jp</a>> ha scritto:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div>
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Hello, I found DMGetLocalVector and DMCreateLocalVector generate Vec of different size in my following codes ==================== call PetscSectionSetup(section,ierr) call DMSetLocalSection(dm_mesh,section,ierr) .. . . . . do somethingcall PetscSectionSetup(section,ierr)call
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<div dir="ltr"> <span style="color:rgb(0,0,0)">Hello,</span><div><span style="color:rgb(0,0,0)"><br></span></div><div><span style="color:rgb(0,0,0)">I found </span>DMGetLocalVector and DMCreateLocalVector generate Vec of different size in my following codes</div><div><br></div><div><font color="#000000">====================</font></div><div>call PetscSectionSetup(section,ierr)<font color="#000000"><br></font></div><div>call DMSetLocalSection(dm_mesh,section,ierr)<br></div><div>......do something</div><div><br></div><div>call PetscSectionSetup(section,ierr)<br></div><div>call DMSetLocalSection(dm_mesh,section,ierr)<br></div><div>......</div><div>call DMCreateLocalVector(dm_mesh,lvec,ierr);<br>call DMGetLocalVector(dm_mesh,llvec,ierr);<br>call VecGetSize(lvec,off,ierr)<br>call VecGetSize(llvec,offl,ierr)<br>call VecDestroy(lvec,ierr)<br>call DMRestoreLocalVector(dm_mesh,llvec,ierr);<br>========================<br></div><div>The pointer in the above program is that DMSetLocalSection is called two times. As the petsc manual indicates, "<span style="color:rgb(50,50,50);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Helvetica Neue",Arial,sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol";font-size:15px">Any existing Section will be destroyed" after calling this function and To my understanding, a new section should be set. </span>Therefore, The above program should obtain values of <i><u>off</u></i> and <i><u>offl </u></i>the same. However, I found that they are different, with <i><u>off </u></i>equal to the size defined by the new section and <u><i>offl</i></u> equal to the size defined by the first one. </div><div><br></div><div>Any problem in above codes? And how can I obtain a Vector of the same size by DMGetLocalVector and DMCreateLocalVector?</div><div><br></div><div>Much thanks for your help.</div><div><br></div><div>X. Yuan, Ph.D. in Solid Mechanics</div></div>
</div></blockquote></div><br clear="all"><br><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature">Stefano</div>
</blockquote></div><br clear="all"><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div>What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.<br>-- Norbert Wiener</div><div><br></div><div><a href="https://urldefense.us/v3/__http://www.cse.buffalo.edu/*knepley/__;fg!!G_uCfscf7eWS!ZPkq_k9vdzTZxeW53aWVTIcDgeGnywSm0tGKDJkJqdwgTomfYjw1lsTMyRtAjtruSslcgLIoKGg7IH_eS1w6$" target="_blank">https://www.cse.buffalo.edu/~knepley/</a><br></div></div></div></div></div></div></div>