%\pagebreak
\section{Controlling the Number of Threads on Multiple Nesting Levels}
\label{sec:nthrs_nesting}
\index{environment variables!OMP_NUM_THREADS@\kcode{OMP_NUM_THREADS}}
\index{OMP_NUM_THREADS@\kcode{OMP_NUM_THREADS}}

The following examples demonstrate how to use the \kcode{OMP_NUM_THREADS} environment 
variable  to control the number of threads on multiple nesting levels:

\cexample{nthrs_nesting}{1}[1]

\fexample{nthrs_nesting}{1}[1]