(gmp.info.gz) Performance optimization
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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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