Should OpenACC pragmas or runtime routines be preferred?
OpenACC has some pragmas and runtime routines, which can be used to basically achieve the same thing.
For example, there is #pragma acc wait and acc_wait() or #pragma acc update [...] and acc_update_[...]().
I started to mostly use the runtime routines in my C++ code.
Is there a difference? Should I prefer one over the other or is it just a matter of style and personal preference?
c++ pragma openacc
asked Jan 18 at 17:19
FabianFabian
94112
add a comment |
OpenACC has some pragmas and runtime routines, which can be used to basically achieve the same thing.
For example, there is #pragma acc wait and acc_wait() or #pragma acc update [...] and acc_update_[...]().
I started to mostly use the runtime routines in my C++ code.
Is there a difference? Should I prefer one over the other or is it just a matter of style and personal preference?
c++ pragma openacc
asked Jan 18 at 17:19
FabianFabian
94112
add a comment |
OpenACC has some pragmas and runtime routines, which can be used to basically achieve the same thing.
For example, there is #pragma acc wait and acc_wait() or #pragma acc update [...] and acc_update_[...]().
I started to mostly use the runtime routines in my C++ code.
Is there a difference? Should I prefer one over the other or is it just a matter of style and personal preference?
c++ pragma openacc
asked Jan 18 at 17:19
FabianFabian
94112
OpenACC has some pragmas and runtime routines, which can be used to basically achieve the same thing.
For example, there is #pragma acc wait and acc_wait() or #pragma acc update [...] and acc_update_[...]().
I started to mostly use the runtime routines in my C++ code.
Is there a difference? Should I prefer one over the other or is it just a matter of style and personal preference?
c++ pragma openacc
c++ pragma openacc
asked Jan 18 at 17:19
FabianFabian
94112
asked Jan 18 at 17:19
FabianFabian
94112
asked Jan 18 at 17:19
FabianFabian
94112
asked Jan 18 at 17:19
FabianFabian
94112
asked Jan 18 at 17:19
FabianFabian
94112
94112
add a comment |
add a comment |
1 Answer
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In general, the pragma's are preferred since they will be ignored by other compilers and when compiling without OpenACC enabled. The runtime API calls would need to be guarded by a macro, like "#ifdef _OPENACC" to maintain portability.
Though, if you don't mind adding the macro guards or loosing portability, then it's mostly a matter of style. Functionally, they are equivalent.
answered Jan 18 at 20:26
Mat ColgroveMat Colgrove
2,20159
Thanks, the point about pragmas being ignored by other compilers is an important one.
– Fabian
Jan 21 at 12:03
add a comment |
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1 Answer
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1 Answer
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active
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In general, the pragma's are preferred since they will be ignored by other compilers and when compiling without OpenACC enabled. The runtime API calls would need to be guarded by a macro, like "#ifdef _OPENACC" to maintain portability.
Though, if you don't mind adding the macro guards or loosing portability, then it's mostly a matter of style. Functionally, they are equivalent.
answered Jan 18 at 20:26
Mat ColgroveMat Colgrove
2,20159
Thanks, the point about pragmas being ignored by other compilers is an important one.
– Fabian
Jan 21 at 12:03
add a comment |
In general, the pragma's are preferred since they will be ignored by other compilers and when compiling without OpenACC enabled. The runtime API calls would need to be guarded by a macro, like "#ifdef _OPENACC" to maintain portability.
Though, if you don't mind adding the macro guards or loosing portability, then it's mostly a matter of style. Functionally, they are equivalent.
answered Jan 18 at 20:26
Mat ColgroveMat Colgrove
2,20159
Thanks, the point about pragmas being ignored by other compilers is an important one.
– Fabian
Jan 21 at 12:03
add a comment |
In general, the pragma's are preferred since they will be ignored by other compilers and when compiling without OpenACC enabled. The runtime API calls would need to be guarded by a macro, like "#ifdef _OPENACC" to maintain portability.
Though, if you don't mind adding the macro guards or loosing portability, then it's mostly a matter of style. Functionally, they are equivalent.
answered Jan 18 at 20:26
Mat ColgroveMat Colgrove
2,20159
In general, the pragma's are preferred since they will be ignored by other compilers and when compiling without OpenACC enabled. The runtime API calls would need to be guarded by a macro, like "#ifdef _OPENACC" to maintain portability.
Though, if you don't mind adding the macro guards or loosing portability, then it's mostly a matter of style. Functionally, they are equivalent.
answered Jan 18 at 20:26
Mat ColgroveMat Colgrove
2,20159
answered Jan 18 at 20:26
Mat ColgroveMat Colgrove
2,20159
answered Jan 18 at 20:26
Mat ColgroveMat Colgrove
2,20159
answered Jan 18 at 20:26
Mat ColgroveMat Colgrove
2,20159
2,20159
Thanks, the point about pragmas being ignored by other compilers is an important one.
– Fabian
Jan 21 at 12:03
add a comment |
Thanks, the point about pragmas being ignored by other compilers is an important one.
– Fabian
Jan 21 at 12:03
Thanks, the point about pragmas being ignored by other compilers is an important one.
– Fabian
Jan 21 at 12:03
Thanks, the point about pragmas being ignored by other compilers is an important one.
– Fabian
Jan 21 at 12:03
add a comment |
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