17.2.345. MPI_T_category_get_info

MPI_T_category_get_info - Query information from a category

17.2.345.1. SYNTAX

17.2.345.1.1. C Syntax

#include <mpi.h>

int MPI_T_category_get_info(int cat_index, char *name, int *name_len,
char *desc, int *desc_len, int *num_cvars, int *num_pvars,
int *num_categories)


  • cat_index: Index of the category to be queried.


  • name_len: Length of the string and/or buffer for name.

  • desc_len: Length of the string and/or buffer for desc.


  • name: Buffer to return the string containing the name of the category.

  • desc: Buffer to return the string containing the description of the category.

  • num_cvars: Number of control variables in the category.

  • num_pvars: Number of performance variables in the category.

  • num_categories: Number of categories contained in the category.

17.2.345.5. DESCRIPTION

MPI_T_category_get_info can be used to query information from a category. The function returns the number of control variables, performance variables, and sub-categories in the queried category in the arguments num_cvars, num_pvars, and num_categories, respectively.

17.2.345.6. NOTES

This MPI tool interface function returns two strings. This function takes two argument for each string: a buffer to store the string, and a length which must initially specify the size of the buffer. If the length passed is n then this function will copy at most n - 1 characters of the string into the corresponding buffer and set the length to the number of characters copied - 1. If the length argument is NULL or the value specified in the length is 0 the corresponding string buffer is ignored and the string is not returned.

17.2.345.7. ERRORS

MPI_T_category_get_info will fail if:

  • MPI_T_ERR_NOT_INITIALIZED: The MPI Tools interface not initialized

  • MPI_T_ERR_INVALID_INDEX: The category index is invalid