ma57_pre_alloc:

Safety factor for work space memory allocation for the linear solver MA57. $\;$
If 1 is chosen, the suggested amount of work space is used. However, choosing a larger number might avoid reallocation if the suggest values do not suffice. This option is only available if Ipopt has been compiled with MA57. The valid range for this real option is $1 \le {\tt ma57\_pre\_alloc } < {\tt +inf}$ and its default value is $1.05$.