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(gmp.info.gz) Performance optimization

Info Catalog (gmp.info.gz) Known Build Problems (gmp.info.gz) Installing GMP
 
 Performance optimization
 ========================
 
 For optimal performance, build GMP for the exact CPU type of the target
 computer, see  Build Options.
 
    Unlike what is the case for most other programs, the compiler
 typically doesn't matter much, since GMP uses assembly language for the
 most critical operation.
 
    In particular for long-running GMP applications, and applications
 demanding extremely large numbers, building and running the `tuneup'
 program in the `tune' subdirectory, can be important.  For example,
 
      cd tune
      make tuneup
      ./tuneup
 
    will generate better contents for the `gmp-mparam.h' parameter file.
 
    To use the results, put the output in the file file indicated in the
 `Parameters for ...' header.  Then recompile from scratch.
 
    The `tuneup' program takes one useful parameter, `-f NNN', which
 instructs the program how long to check FFT multiply parameters.  If
 you're going to use GMP for extremely large numbers, you may want to
 run `tuneup' with a large NNN value.
 
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