iterative scaling still can be useful for limited hardware and large models, but may not working well in contact analysis compared to PaStiX or Pardiso. Also model with shell element, but shown better for solid element, limited to ~800k equation or ~55k element and ~1300k equation or ~290k element respectively. In early before Pardiso and PaStiX implemented, i have been tested personally on Windows 32bit limited by maximum memory of 3Gb, below another test on 64bit reported from external references.
image from Jörg Hiller (2008)