16.2.7. Multiple Levels of Interception
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The scheme given here does not directly support the nesting of profiling
functions, since it provides only a single alternative name for each MPI
function. Consideration was given to an implementation that would allow
multiple levels of call interception, however we were unable to construct
an implementation of this that did not have the following disadvantages
- assuming a particular implementation language, and
- imposing a run time cost even when no profiling was taking place.
Since one of the objectives of MPI is to permit efficient, low latency
implementations, and it is not the business of a standard to require a
particular implementation language, we decided to accept the scheme
outlined above.
Note, however, that it is possible to use the scheme above to implement a
multi-level system, since the function called by the user may call many
different profiling functions before calling the underlying MPI function.
This capability has been demonstrated in the PNMPI tool
infrastructure [59].
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