[ADOL-C] ADOL-C error: while reading values tape!

Antoine De Blois antoine.deblois at aero.bombardier.com
Fri Feb 20 13:45:06 EST 2015

Hi everyone,

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:

ADOL-C error: while reading values tape!

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.

Am I missing something? Is there a way the "flush" the buffers?

Thank you once again,

Antoine DeBlois
Specialiste ingenierie, MDO lead / Engineering Specialist, MDO lead
Aéronautique / Aerospace
514-855-5001, x 50862
antoine.deblois at aero.bombardier.com<mailto:antoine.deblois at aero.bombardier.com>

2351 Blvd Alfred-Nobel
Montreal, Qc
H4S 1A9

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