offload error: cannot load library to the device

Dario_I_ — Tue, 03 Dec 2013 12:08:56 GMT

I am trying to program the Xeon Phi in offload mode. The program below should just construct objects from the standard library on the card, but linking fails with the following error:

On the remote process, dlopen() failed. The error message sent back from the sink is /var/volatile/tmp/coi_procs/1/27843/load_lib/icpcoutdlt28i: undefined symbol: _ZNSt6vectorIdSaIdEEC1EmRKdRKS0_

offload error: cannot load library to the device 0 (error code 20)
On the sink, dlopen() returned NULL. The result of dlerror() is "/var/volatile/tmp/coi_procs/1/27843/load_lib/icpcoutdlt28i: undefined symbol: _ZNSt6vectorIdSaIdEEC1EmRKdRKS0_"

if compiled with:

icpc -openmp example.cpp

Looks like he is not finding the std library for the mic ..... whats the correct compilation line?

Dario

[cpp]#include<iostream>

#include<math.h>

#include<vector>

#include<omp.h>

__attribute__((target(mic))) void wrapper() {

std::vector<double> x(2,0.1), f(1);

}

int main () {

#pragma omp parallel sections

{

#pragma omp section

{

std::cout << "Executing on CPUs\n";

wrapper();

std::cout << "I am done on CPUs\n";

}

#pragma omp section

{

std::cout << "Executing on Xeon Phi\n";

#pragma offload target(mic)

{

wrapper();

}

std::cout << "I am done on Xeon Phi\n";

}

return 0;

}[/cpp]

Compilation line is fine.

Kevin_D_Intel — Tue, 03 Dec 2013 17:43:58 GMT

Compilation line is fine. Program needs to declare instances of headers for the MIC side. Change the include statements to something like this:

#pragma offload_attribute (push, target(mic))
#include<iostream>
#include<vector>
#pragma offload_attribute (pop)

You may need to add other includes within the offload_attribute as you expand the code within the offload sections.

Thanks! That did it :)

Dario_I_ — Tue, 03 Dec 2013 18:17:28 GMT

Thanks! That did it :)

topic offload error: cannot load library to the device in Software Archive

offload error: cannot load library to the device

Compilation line is fine.

Thanks! That did it :)