[petsc-users] Question on the compiler flags in Makefile

[Danyang Su]

On 14-12-01 01:48 PM, Satish Balay wrote:
> On Mon, 1 Dec 2014, Danyang Su wrote:
>
>> Hi All,
>>
>> I have a PETSc application that need additional compiling flags to build
>> Hybrid MPI-OpenMP parallel application on WestGrid Supercomputer (Canada)
>> system.
>>
>> The code and makefile work fine on my local machine for both Windows and
>> Linux, but when compiled on WestGrid Orcinus System for the OpenMP version and
>> Hybrid version, the OpenMP parallel part does not take effect while only MPI
>> parallel part takes effect. There is no error while compiling the code. I am
>> not sure if there is something wrong with the makefile or something other
>> setting.
>>
>> The compiler flags need to build Hybrid MPI-OpenMP version on WestGrid Orcinus
>> is "-shared-intel -openmp -O2 -xSSSE3 -axSSE4.2,SSE4.1 -ip" . For the
>> sequential version or MPI parallel version, these flags are not needed.
>>
>> Would anybody help to check if the compiler flag (red) in the makefile is
>> correct?
>>
>> Thanks,
>>
>> Danyang
>>
>> The makefile is shown below
>>
>> include ${PETSC_DIR}/conf/variables
>> include ${PETSC_DIR}/conf/rules
>>
>> #FC = ifort
>> SRC =./../
>>
>> # Additional flags that may be required by the compiler ...
>> # This is required for the OpenMP parallel version and Hybrid MPI-OpenMP
>> parallel version
>> # not necessary for the sequential version and MPI version
>> DFCFLAG = -shared-intel -openmp -O2 -xSSSE3 -axSSE4.2,SSE4.1 -ip
>>
>> #Flag for WestGrid Orcinus System
>> #Load PETSc module before make
>> #module load /global/system/Modules/modulefiles/intel-2011/petsc
>> FPPFLAGS = -DLINUX -DRELEASE -DPETSC -DMPI -DOPENMP
>>
>> SOURCES = $(SRC)gas_advection/relpfsat_g.o\
>>          $(SRC)int_h_ovendry.o\
>>          $(SRC)dhconst.o\
>>          ...
>>
>> min3p: $(SOURCES) chkopts
>>          -${FLINKER} $(FPPFLAGS) $(DFCFLAG) -o ex $(SOURCES) ${PETSC_LIB} ${DLIB}
> You are using DFCFLAG only during link time - and not at compile time.
>
> If you need to specify flags for both compile time and linktime - use FFLAGS
>
> i.e:
>
> FFLAGS = -shared-intel -openmp -O2 -xSSSE3 -axSSE4.2,SSE4.1 -ip
> [and remove DFCFLAG]
>
> Also you should specify FFLAGS,FPPFLAGS before the 'incude' directives in the makefile.
>
> Satish
Hi Satish,

Thanks very much. It now works.

Danyang
>
>