offload error, dlopen() failed

offload error, dlopen() failed

Hi all,

I run my program on MIC by the offload mode. However, it returns error:

/var/volatile/tmp/coi_procs/1/29947/load_lib/iccout4vLAcb: undefined symbol: _ZNSt3setIiSt4lessIiESaIiEED1Ev
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/1/29947/load_lb/iccout4vLAcb: undefined symbol: _ZNSt3setIiSt4lessIiESaIiEED1Ev"

The native mode works fine. Could anyone please tell me how to figure out this problem? Thanks!

The function of the program is to read numbers from a *.txt file into a vector and an ordered_map

The compile command I used is:

icc -openmp -std=c++0x -O main main.cpp A.cpp

The following are the codes:

main.h

#ifndef MAIN_H
#define MAIN_H
#include "A.h"
#include <omp.h>
#include <sys/time.h>

using namespace std;

__attribute__((target(mic))) static double dtime()
//static double dtime()
{
	double tseconds = 0;
	struct timeval mytime;
	gettimeofday(&mytime,(struct timezone*)0);
	tseconds = (double)(mytime.tv_sec+(double)mytime.tv_usec*1e-6);
	return tseconds;
}
#endif

main.cpp

#include "main.h"

using namespace std;

int main()
{
	cout << "Start.\n";
	//string my_str = "content_string";
	int N_total = 10, index_counter = 0, numthreads = 0;
	double t_begin = dtime(), t_end;
#pragma offload target (mic)
#pragma omp parallel
#pragma omp master
	numthreads = omp_get_num_threads();
	printf("Initializing.. %d Threads",numthreads);

#pragma offload target(mic)
#pragma omp  parallel for private (index_counter)
	for (index_counter=0; index_counter<N_total; index_counter++)
	{
		if (index_counter==0)
			printf("\n%d threads.\n", numthreads);
		string my_str = "content_string";
		vector< vector<int> > my_vec_vec;
		vector<int> my_vec;
		set<int> my_set;
		unordered_map<int,int> my_u_map;
		int my_int = 1;	
		double t_i_start=dtime(), t_i_end;
		A_func_1(my_str,my_vec_vec,my_set,my_u_map);
		
		t_i_end = dtime();
		//A_func_2(my_vec_vec,my_u_map,my_int);
		printf("time: %9.5lf\n",(t_i_end-t_i_start));
	}
	
	return 0;
}

A.h

#ifndef A_H
#define A_H
#include <omp.h>
#include <fstream>
#include <iostream>
#include <map>
#include <set>
#include <sstream>
#include <stdlib.h>
#include <string>
#include <time.h>
#include <unordered_map>
#include <vector>


using namespace std;

 __attribute__((target(mic))) void A_func_1(string my_str, vector<vector<int> >& my_vec_vec, set<int>& my_set, unordered_map<int,int>& my_u_map);
 __attribute__((target(mic))) void A_func_2(vector<vector<int> >& my_vec_vec, unordered_map<int,int>& my_u_map, int my_int=0);
//void A_func_1(string my_str, vector<vector<int> >& my_vec_vec, set<int>& my_set, unordered_map<int,int>& my_u_map);
//void A_func_2(vector<vector<int> >& my_vec_vec, unordered_map<int,int>& my_u_map, int my_int=0);

#endif

A.cpp

#include "A.h"
#include "stdio.h"
#include "string.h"

using namespace std;

void A_func_1(string my_str, vector<vector<int> >& my_vec_vec, set<int>& my_set, unordered_map<int,int>& my_u_map)
{
	FILE *pFILE = fopen(my_str.c_str(),"r"); 
	string string_buffer;

	char *input_buffer_char=NULL; size_t i_b_c_length;
	char const_char_buffer_comma[40960] = "";
	char char_buffer_comma;
	
	int int_buffer, count_buffer;
	vector<int> vec_buffer;
	unordered_map<int,int>::iterator key_pos;
	if (pFILE==NULL)
		printf("%s open fail!\n",my_str.c_str());
	else
	{
		while (getline(&input_buffer_char,&i_b_c_length,pFILE)!=-1)
		{
			strcpy(const_char_buffer_comma,input_buffer_char);
			string_buffer = string(const_char_buffer_comma);
			istringstream iss(string_buffer);	// each line, each transaction
			while (iss>>int_buffer)
			{
				vec_buffer.push_back(int_buffer); //my_set.insert(int_buffer);
				key_pos = my_u_map.find(int_buffer);
				if (key_pos!=my_u_map.end())
				{
					count_buffer = key_pos->second;
					my_u_map.erase(key_pos);
					my_u_map.insert(pair<int,int>(int_buffer,count_buffer+1));
				}
				else
				{
					my_u_map.insert(pair<int,int>(int_buffer,1));
				}
				iss >> char_buffer_comma; // eliminate the ","
			}
			my_vec_vec.push_back(vec_buffer);	// one transaction push_backed into transaction set
			vec_buffer.clear();
		}
		fclose(pFILE);
	}
/*
	srand(time(NULL));
	int n_length = rand()%10+1;
	for (int i=0; i<n_length ;i++)
	{
		vector<int> temp_vec;
		int m_length = rand()%10+1;
		for (int j=0; j<m_length; j++)
			temp_vec.push_back(rand()%20);
		my_vec_vec.push_back(temp_vec);
	}
	string string_buffer;
	int int_buffer;
	ifstream fin(my_str.c_str(),ios::in);
	if (!fin.is_open())
		printf("file open error.\n");
	else
	{
		while (getline(fin,string_buffer,'\n'))
		{
			istringstream iss(string_buffer);
			while (iss>>int_buffer)
			{
				my_set.insert(int_buffer);
			}
		}
	}
*/
}
void A_func_2(vector<vector<int> >& my_vec_vec, unordered_map<int,int>& my_u_map, int my_int)
{
	int n = my_vec_vec.size();
	for (int i=0; i<n; i++)
		for (int j=0; j<my_vec_vec[i].size(); j++)
			my_vec_vec[i][j] = j;
}

 

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Last post
For more complete information about compiler optimizations, see our Optimization Notice.

Maybe the font of the error is unreadable. Here is another font:

On the remote process, dlopen() failed. The error message sent back from the sink is /var/volatile/tmp/coi_procs/1/29947/load_lib/iccout4vLAcb: undefined symbol: _ZNSt3setIiSt4lessIiESaIiEED1Ev
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/1/29947/load_lb/iccout4vLAcb: undefined symbol: _ZNSt3setIiSt4lessIiESaIiEED1Ev"

The offload code/compilation requires content from various includes inside A.h. Wrapper those includes with offload_attribute push/pop as shown:

A.h:

#ifndef A_H
#define A_H
#pragma offload_attribute (push, target (mic))
#include <omp.h>
#include <fstream>
#include <iostream>
#include <map>
#include <set>
#include <sstream>
#include <stdlib.h>
#include <string>
#include <time.h>
#include <unordered_map>
#include <vector>
#pragma offload_attribute (pop)


using namespace std;

 __attribute__((target(mic))) void A_func_1(string my_str, vector<vector<int> >&
 my_vec_vec, set<int>& my_set, unordered_map<int,int>& my_u_map);
 __attribute__((target(mic))) void A_func_2(vector<vector<int> >& my_vec_vec, un
ordered_map<int,int>& my_u_map, int my_int=0);
//void A_func_1(string my_str, vector<vector<int> >& my_vec_vec, set<int>& my_se
t, unordered_map<int,int>& my_u_map);
//void A_func_2(vector<vector<int> >& my_vec_vec, unordered_map<int,int>& my_u_m
ap, int my_int=0);

#endif

 

Thanks!

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