Re: OpenMP + ACLiC

From: OKUMURA, Akira <oxon_at_astro.isas.jaxa.jp>
Date: Wed, 15 Sep 2010 11:25:39 -0700

Hello Philippe,

Thank you again. But I get the same error again. Does this work on your machine? I tried gcc 4.2.1 on Snow Leopard and gcc 4.4.0 on Scientific Linux 5.

$ root
root [0] TString cmd(gSystem->GetMakeSharedLib()) root [1] cmd.ReplaceAll("g++", "g++ -fopenmp") (class TString)"cd $BuildDir ; g++ -fopenmp -c $Opt -m64 -pipe -Wshadow -W -Wall -Woverloaded-virtual -fsigned-char -fno-common -D_REENTRANT -pthread $IncludePath $SourceFiles ; MACOSX_DEPLOYMENT_TARGET=10.6 g++ -fopenmp $ObjectFiles -dynamiclib -single_module -undefined dynamic_lookup -lwcs $DepLibs -o $SharedLib" root [2] gSystem->SetMakeSharedLib(cmd)
root [3] .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 10:30, Philippe Canal wrote:

> 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 - 20:25:54 CEST