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I must change the FFLAGS_OPT := -O1 to build and run CESM

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xlong@...
I must change the FFLAGS_OPT := -O1 to build and run CESM

Linux cluster
Intel ifort and icc 10.1.022
mpich2 1.3a2
CESM 1_0_5

If I leave FFLAGS_OPT := -O2, the model fails at build stage.(build the land component)

I change it to FFLAGS_OPT := -O1, then cesm can build and run successfully.

My question is ,
How much the FFLAGS_OPT := -O1 will slow down the model?
Will it affect the scientific result? (I guess no?)

Thanks

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