OMP_STACKSIZE – Set default thread stack size ¶Set the default thread stack size in kilobytes, unless the number
is suffixed by B, K, M or G, in which
case the size is, respectively, in bytes, kilobytes, megabytes
or gigabytes. This is different from pthread_attr_setstacksize
which gets the number of bytes as an argument. If the stack size cannot
be set due to system constraints, an error is reported and the initial
stack size is left unchanged. If undefined, the stack size is system
dependent.
OpenMP specification v4.5, Section 4.7