Implementation of the Rational Krylov subspace method for marine tCSEM forward modeling and sensitivity calculation on GPU.

Sommer, Malte, Hölz, Sebastian and Jegen, Marion (2017) Implementation of the Rational Krylov subspace method for marine tCSEM forward modeling and sensitivity calculation on GPU. Open Access [Talk] In: 6. International Symposium on Three-Dimensional Electromagnetics (3DEM-6). , 28.-30.03.2017, Berkeley, California, USA .

[img]
Preview
Text (Abstract)
msommer.pdf - Published Version

Download (234Kb) | Preview
[img] Text
TalkMsommer2017-1.pdf - Presentation
Restricted to Registered users only

Download (1282Kb)

Abstract

We implemented the Rational-Krylov-Subspace (RKS) Algorithm on graphics cards for marine 3D time domain CSEM forward modeling as well as sensitivity calculation. We present a comparison between the run-time of a) the new code and the older Polynomial-Krylov-Subspace method code and b) with run-times on old and new graphics cards (to quantify the improvements by hardware and by algorithms). We show, that both together improve the performance significantly by a factor of 20 in comparison with an old GPU parallelized code. For sensitivity computation, we expanded the implementation of the RKS algorithm to block spaces and implemented a model reduction framework, instead of the commonly used adjoint method. Comparisons with brute-forced Jacobians validate the approach.

Document Type: Conference or Workshop Item (Talk)
Keywords: forward modeling, sensitivity, finite difference, marine CSEM, GPU, Rational Krylov Subspace
Research affiliation: OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Date Deposited: 16 May 2017 09:49
Last Modified: 16 May 2017 12:31
URI: http://oceanrep.geomar.de/id/eprint/38001

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...