Function: _def_threadsize
Class: default
Section: default
C-Name: sd_threadsize
Prototype:
Help:
Doc: This default is specific to the \emph{parallel} version of PARI and gp
 (built via \kbd{Configure --mt=pthread} or \kbd{mpi}) and is ignored
 otherwise. In parallel mode,
 each thread allocates its own private \tev{stack} for its
 computations, see \kbd{parisize}. This value determines the size in bytes of
 the stacks of each thread, so the total memory allocated will be
 $\kbd{parisize}+\kbd{nbthreads}\times\kbd{threadsize}$.

 If set to $0$, the value used is the same as \kbd{parisize}. It is not
 easy to estimate reliably a sufficient value for this parameter because PARI
 itself will parallelize computations and we recommend to not set this value
 explicitly unless it solves a specific problem for you. For instance if you
 see frequent messages of the form
 \bprog
  *** Warning: not enough memory, new thread stack 10000002048
 @eprog (Meaning that \kbd{threadsize} had to be temporarily increased.)
 On the other hand we strongly recommend to set \kbd{parisizemax} and
 \kbd{threadsizemax} to a nonzero value.

 The default value is $0$.
