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<p class="MsoNormal">>> If there was an error then you should have seen PETSc output to that effect. Could you have missed that?<o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">I don’t see any error show up in the output, and the run continues happily even with the error checks in place, so I don’t think that’s it.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">>> </span>
You should definitely add these error check, but that gets rid of the error! <o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">I agree completely, they should be there. I would be much more comfortable if just putting them in didn’t solve the error I put them in to look for..<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">>> </span>
Could this be a compiler error?<span style="font-size:11.0pt;font-family:Calibri"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">We’re using the PGI compiler, and I’ve tried it with versions 16.5 (with your PETSc builds) and 15.10 (with the cray-petsc-3.7 build) and seen the same problem. But, yes, this could definitely
be a compiler error. I’m rebuilding the code with optimizations disabled to run the memory checking, so I’ll have a chance to see if maybe the compiler is making a mistake there.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">Does PETSc’s logging count VecScatter calls and messages passed? Maybe I can look at the logs and compare counts for a working run to a broken run and see if those last two scatters are
getting optimized out.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">--steve <o:p>
</o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
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<p class="MsoNormal">On 8/25/16, 5:48 PM, "Mark Adams" <<a href="mailto:mfadams@lbl.gov">mfadams@lbl.gov</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:Calibri"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:Calibri">The troubling bit about this, which caused me to suggest that it was a race condition, was that if I modify the code a little
bit I can get the correct result from the scatter. For example, we weren’t always checking the returned error flag.
</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">If there was an error then you should have seen PETSc output to that effect. Could you have missed that?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">You should definitely add these error check, but that gets rid of the error! Could this be a compiler error?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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