Fortran OpenACC program compiled with nvfortran -O2 crashes, but -O1 works

Accelerated Computing HPC Compilers nvc, nvc++ and nvfortran
1

Hi, I compiled my OpenACC fortran code with nvfortran with:
-Mlarge_arrays -m64 -O1 -Wall -Werror -gpu=ccall,managed,implicitsections -stdpar -traceback

The exe file works well with -O1, but if I update to -O2, it crashes (float point error/divided by zero)

Have anyone experienced same behaviors? Thanks.

Due to the complexity of the code, it’s not easy to make a simple repeatable case.

Thanks.

2

Hi honggangwang1979,

Unfortunately it could be any number of things and without a reproducer or more info, I can’t tell what’s wrong. Although a minimal reproducing example is preferred, if you can point me to the full source as well as instructions on how to reproduce the problem, I can take a look.

-Mat

3

Hi Mat,

Thank you so much for your quick reply.

Is it ok for you to give me your email address and I will send you a link to my repository since I cannot public it?

Thank you so much!

4

Send it to me via direct message. You can do this by clicking the link on my user name to go to my profile. From there, select the “message” box.