Dear Rcpp Developer List subscribers,
I am experimenting with OpenMP on Rcpp. Here is a simple program I'm trying to
run on my (4-core MacBookPro 8,3, Intel Cor i7, 2.3 GHz) computer (clang-omp
compiler):
#include <RcppArmadillo.h>
#include <math.h>
#ifdef _OPENMP
#include <omp.h>
#endif
#include<map>
#include<vector>
#include<random>
//[[Rcpp::plugins(openmp)]]
//[[Rcpp::depends(RcppArmadillo)]]
using namespace Rcpp;
using namespace arma;
// [[Rcpp::export]]
void nof(int nn_thrds)
{
omp_set_num_threads(nn_thrds);
#pragma omp parallel for
for(int i = 0; i < 100; i++) {
#pragma omp critical
{
Rcout << i << std::endl;
}
}
}
/***R
nof(2)
*/
PROBLEMS:
1. (Minor): Diagnostics message use of undeclared identifier
omp_set_num_threads,
2. (Major): The program terminates the R session with
R Session Aborted
R encountered a fatal error
The session was terminated
Sometimes I receive the messages
Error C stack is too close to the limit
Error during wrapup: C stack usage is too close to the limit
Type Error: 'null' is not an object (evaluating 'c[a]')
I use RStudio 0.99.893
QUESTIONS:
1. What is going on?
2. Is there any legible description of such error messages on the
Internet?--I mean, they seem way too cryptic to me...
Thank you in advance.
Anguel
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