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<p class="MsoNormal">Hi everyone,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I have been using ADOL-C to get the jacobian matrix of CFD adjoint optimization problems. I recently implemented the viscous terms, which require many more operations in the tape. This morning, I got the following error message for the
first time:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">ADOL-C error: while reading values tape!<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I also observed that there were a ADOLC-Taylors_1.tap file generated (roughly 4 Mb). This would mean that I exceeded the TBUFSIZE. What is surprising is that this error message was output after several design iterations. I use the trace
command with a single tape ID along with the keep = 1 to improve the computational time. I always thought that the second call to trace would overwrite the Taylor stack, but since I exceed the buffer after several iterations, this suggests that the buffer
is augmented on the subsequent calls…? I tried with keep = 0, but it is much slower.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Am I missing something? Is there a way the “flush” the buffers?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thank you once again,<o:p></o:p></p>
<p class="MsoNormal">Antoine<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#7F7F7F">Antoine DeBlois</span></b><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#7F7F7F"><br>
Specialiste ingenierie, MDO lead / Engineering Specialist, MDO lead<br>
Aéronautique / Aerospace</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#131E29"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#7F7F7F">514-855-5001, x 50862<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#131E29"><a href="mailto:antoine.deblois@aero.bombardier.com"><span style="color:blue">antoine.deblois@aero.bombardier.com</span></a><br>
<br>
</span><i><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#7F7F7F">2351 Blvd Alfred-Nobel</span></i><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#7F7F7F"><br>
<i>Montreal, Qc<o:p></o:p></i></span></p>
<p class="MsoNormal"><i><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#7F7F7F">H4S 1A9</span></i><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#7F7F7F"><br>
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