On 19 March 2016 at 14:11, aakrem...@aol.com wrote:
| 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,
So you don't declare OMP correct.
| 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]')
That means you are messing your calls up and the stack does not get
unwound. Simplify.
| I use RStudio 0.99.893
Irrelevant.
| QUESTIONS:
| 1. What is going on?
You have bugs.
| 2. Is there any legible description of such error messages on the
Internet?
| --I mean, they seem way too cryptic to me...
At least the resources are free...
Dirk
| Thank you in advance.
|
| Anguel
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--
http://dirk.eddelbuettel.com | @eddelbuettel | e...@debian.org
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