Hello Dario, Thank you for your reply, we don't use Eigen::SparseLU solver but chrono::MINRES solver (and also chrono::APGD) with smooth contact and Euler Implicit Linearized time stepper. With this configuration, the chrono demos we tested, like demo_FEA_dynamics, work fine. The errors we encounter is only when we run demos with new objects (classes) derived from Chrono (in the FRyDoM API).
Maybe this error is linked to the EIGEN_MAKE_ALIGNED_OPERATOR_NEW method that we don't define as a public method in all our classes ? Related to this issue : https://eigen.tuxfamily.org/dox/group__TopicStructHavingEigenMembers.html. We are wondering if the CPU time saving provided by the SIMD option is limited to certain solvers or application cases only, in order to know if we should use it. Le mercredi 3 août 2022 à 10:37:48 UTC+2, [email protected] a écrit : > Hi Camille, > I'm not sure if it is the same issue I encountered, but might be worth you > to just briefly visit this issue: > https://github.com/projectchrono/chrono/issues/290 > > In my case the Eigen::SparseLU solver was having issue, at the point that > solutions themselves were off and it was due to misalignment issues. > Not sure if it's the same, just FYI. > > Might be useful for us to know for which solver setup you are observing > such issues! > > Dario > > Il giorno mercoledì 3 agosto 2022 alle 10:27:49 UTC+2 Camille Chauvigné ha > scritto: > >> Hello, >> >> We recently updated our FRyDoM application, which used Chrono v4 to the >> latest release version of Chrono v7.0.3, which includes notably Eigen. >> However, we encounter misalignment errors at the run time when SIMD option >> is activated (SSE/AVX/FMA). These errors disappear when SIMD option is >> disabled. We have therefore deactivated this option for the moment although >> this prevents us from reducing the computation time. Before to adapt the >> code, we wondered what was the CPU time reduction we can expect with the >> SIMD option in Chrono ? Besides, does this option is limited to some >> solvers or models ? >> >> Thank you in advance >> >> Best regards, >> >> Camille > > -- You received this message because you are subscribed to the Google Groups "ProjectChrono" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/projectchrono/e592d49b-d369-440b-b0e0-90f2efc7d3a2n%40googlegroups.com.
