On Wed, Nov 13, 2024 at 1:33 PM Patrick Dupre via users <users@xxxxxxxxxxxxxxxxxxxxxxx> wrote: > > I am not sure this issue is entirely relevant on this mailing list. > Maybe you could redirect me. > > The same application (relatively heavy code), provides different values when it > is run and compiled on 2 different machines. > Both F40 (last update) > gcc (GCC) 14.2.1 20240912 (Red Hat 14.2.1-3) > One > Intel(R) Core(TM) i5-7400 CPU @ 3.00GHz > The other one > Intel(R) Core(TM) i7-8700 CPU @ 3.20GHz > Actually, this happens when I use the gsl library. > gsl-devel-2.7.1-8.fc40.x86_64 > for integration (gsl_integration_cquad). > Before integration, the values are strictly identical. > The same Makefile is used. > Now, if I copy the code generated by the machine A on machine B, > I get the same results as it had been run on machine A. > The size of both codes are slightly different. > I conclude that the issue is due to the compiler. > Indeed, the difference in the generated values seems pretty constant, > i.e., it seems proportional to the value itself: of the order 2.7e-8 (relative difference) > i.e. a lot higher than the accuracy of the machine: < 1e-35. > > Which one is the good one? > Why this behavior? > Can I solve the issue? I would take the issue to the libgsl folks at <https://www.gnu.org/software/gsl/>. The help-gsl <help-gsl@xxxxxxx> users mailing list looks like the right place. I would not be surprised if they knew the problem based on your description. Jeff -- _______________________________________________ users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/users@xxxxxxxxxxxxxxxxxxxxxxx Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue
