|Message: Performance of optical transport in 4.9.5||Not Logged In (login)|
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I've recently added a 4.9.5 installation to my arsenal, and was ready to migrate, however, upon successful compilation of my code on the new kernel, I found that my simulations took much longer than they did under 4.9.4. Except for a few edits to make the my code compatible with the new Kernel (change G4MaterialPropertiesTable->GetProperty() to G4MaterialPropertiesTable->Value(), etc.), the application should be identical. When I disable optical transport, the code versions run more or less at the same speed (4.9.5 being ~5% slower). Enabling optical transport results in a 2x difference in execution time. When I enable Mie Scattering, the execution time is again doubled resulting in an overall 4-5x scaling. Keep in mind that I am running THE SAME SIMULATION for both codes, just the kernel is changing. It seems to me there is a significant difference, probably at the step level between these codes to cause such a drastic slow down. I've tried running a profiler (Sleepy), the results of which I can post if deemed useful, and then comparing the code for the top 5 subroutines that show up (for exclusive timing). I don't really see any significant difference at the code level, which leads me to believe the problem is more complex. Has anyone had a similar experience with the new Kernel? Any suggestions?
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