pmUnitsStr(3) convert a performance metric's units into a string


#include <pcp/pmapi.h>

const char *pmUnitsStr(const pmUnits *pu)

cc ... -lpcp


The encoding of a performance metric's dimensionality and scale uses a pmUnits structure; see pmLookupDesc(3).

As an aid to labeling graphs and tables, or for error messages, pmUnitsStr will take a dimension and scale specification as per pu, and return the corresponding text string.

For example {1, -2, 0, PM_SPACE_MBYTE, PM_TIME_SEC, 0}, as the value of *pu gives the result string Mbyte / sec^2.

The string value is held in a single static buffer, so the returned value is only valid until the next call to pmUnitsStr.

If the ``count'' dimension is non-zero, and the ``count'' scale is not zero, then the text string will include a decimal scaling factor, eg. count x 10^6.

As a special case, if all components of the dimension are zero, then the ``count'' scale is used to produce the text. If this scale is zero the result is an empty string, otherwise the result is of the form x1 0^2.