Re: OpenMP + ACLiC

 Hi Akira,

You also need to add *-fopenmp to the compiler invocations. For that do:
TString cmd( gSystem->GetMakeSharedLibs ); cmd.ReplaceAll("g++","g++ -fopenmp");
gSystem->SetMakeSharedLibs(cmd);

Cheers,
Philippe.
*
On 9/15/10 11:25 AM, OKUMURA, Akira wrote:
> Hello Philippe,
>
> Thanks for the advise. But I still get the same error.
>
> #include <omp.h>
> #include <time.h>
> #include <iostream>
>
> void pi()
> {
> const Int_t kN = 100000000;
> long double top = 0.L;
> long double bottom = 0.L;
> long double kStep = 1.L/kN;
> long double sum = 0.L;
>
> #ifndef __CINT__
> #pragma omp parallel private(top, bottom)
> #endif
> {
> #ifndef __CINT__
> #pragma omp for reduction(+:sum)
> #endif
> for(Int_t i = 0; i < kN; i++) {
> top = 4.L/(1.L + (kStep*i)*(kStep*i));
> bottom = 4.L/(1.L + (kStep*(i+1))*(kStep*(i + 1)));
> sum += (top + bottom)*kStep/2.L;
> } // i
> }
> std::cout.precision(16);
> std::cout << "pi = " << sum << "\n";
> }
>
> root [4] .L pi.C++
> Info in <TUnixSystem::ACLiC>: creating shared library /Users/oxon/./pi_C.so
> In file included from /Users/oxon/pi_C_ACLiC_dict.h:34,
> from /Users/oxon/pi_C_ACLiC_dict.cxx:16:
> /Users/oxon/./pi.C: In function ‘void pi()’:
> /Users/oxon/./pi.C:14: error: expected ‘#pragma omp’ clause before ‘public’
> i686-apple-darwin10-g++-4.2.1: /Users/oxon/pi_C_ACLiC_dict.o: No such file or directory
> Error in <ACLiC>: Compilation failed!
>
> Regards,
>
> --
> OKUMURA, Akira oxon@{astro.isas.jaxa.jp,stanford.edu}
> Institute of Space and Astronautical Science (ISAS/JAXA)
> Now at KIPAC/SLAC/Stanford
> Varian Physics #306
> 382 Via Pueblo Mall, MC 406 Stanford, CA94305
> TEL 650-736-0971/FAX 650-724-5065
> Skype : okumura.akira
>
> On 2010/09/15, at 8:53, Philippe Canal wrote:
>
>> Hi,
>>
>> You need to at least hide the #pragma from CINT:
>>
>> #ifndef __CINT__
>> #pragma omp parallel private(top, bottom)
>> #endif
>> {
>> #ifndef __CINT__
>> #pragma omp for reduction(+:sum)
>> #endif
>> for(Int_t i = 0; i < kN; i++) {
>>
>> Cheers,
>> Philippe.
>>
>> On 9/15/10 10:47 AM, OKUMURA, Akira wrote:
>>> Hello ROOTers,
>>>
>>> Does ACLiC support OpenMP?
>>>
>>> I started learning OpenMP to improve the speed of my analysis. The following is an example to calculate pi with OpenMP.
>>>
>>> === pi.C ===
>>> #include <omp.h>
>>> #include <time.h>
>>> #include <iostream>
>>>
>>> void pi()
>>> {
>>> const Int_t kN = 100000000;
>>> long double top = 0.L;
>>> long double bottom = 0.L;
>>> long double kStep = 1.L/kN;
>>> long double sum = 0.L;
>>>
>>> #pragma omp parallel private(top, bottom)
>>> {
>>> #pragma omp for reduction(+:sum)
>>> for(Int_t i = 0; i < kN; i++) {
>>> top = 4.L/(1.L + (kStep*i)*(kStep*i));
>>> bottom = 4.L/(1.L + (kStep*(i+1))*(kStep*(i + 1)));
>>> sum += (top + bottom)*kStep/2.L;
>>> } // i
>>> }
>>> std::cout.precision(16);
>>> std::cout << "pi = " << sum << "\n";
>>> }
>>> ============
>>>
>>> But I got the following error.
>>> ============
>>> root [0] gSystem->SetIncludePath("-fopenmp")
>>> root [1] gSystem->AddLinkedLibs("-lgomp")
>>> root [2] .L pi.C+O
>>> Info in <TUnixSystem::ACLiC>: creating shared library /Users/oxon/./pi_C.so
>>> In file included from /Users/oxon/pi_C_ACLiC_dict.h:34,
>>> from /Users/oxon/pi_C_ACLiC_dict.cxx:16:
>>> /Users/oxon/./pi.C: In function ‘void pi()’:
>>> /Users/oxon/./pi.C:13: error: expected ‘#pragma omp’ clause before ‘public’
>>> i686-apple-darwin10-g++-4.2.1: /Users/oxon/pi_C_ACLiC_dict.o: No such file or directory
>>> Error in <ACLiC>: Compilation failed!
>>> ============
>>>
>>> It seems that some of OpenMP words are not handled properly in generation of a dictionary. I suppose ACLiC does not support OpenMP yet.
>>>
>>> If ACLiC supports OpenMP, how can I run the script in ROOT? This example runs as I expected in standalone C++ program.
>>>
>>> I am using ROOT trunk and GCC (i686-apple-darwin10-g++-4.2.1 (GCC) 4.2.1 (Apple Inc. build 5664)) on Snow Leopard.
>>>
>>> Regards,
>>>
>>> --
>>> OKUMURA, Akira oxon@{astro.isas.jaxa.jp,stanford.edu}
>>> Institute of Space and Astronautical Science (ISAS/JAXA)
>>> Now at KIPAC/SLAC/Stanford
>>> Varian Physics #306
>>> 382 Via Pueblo Mall, MC 406 Stanford, CA94305
>>> TEL 650-736-0971/FAX 650-724-5065
>>> Skype : okumura.akira
>>>
Received on Wed Sep 15 2010 - 19:30:08 CEST