Solaris SPARC speed issue

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http://www.unix.com – Hello helpful Unix gurus! First, I appreciate any help I can get. I have a product that we have ported (for years now) on Solaris SPARC 7.x OS from 1998 (or around that time I guess) that is compiled to a 32 executable. It has run (with various modifications over the years) on any Solaris SPARC platform (as far as I know). Recently I have a customer that expects the program to run much faster. This program is a number crunching type of utility that goes off and does file input, parsing, bit manipulation and output and then exits, so normally it is pretty fast). It is written in C/C++ and (HowTos)