shootout

The Computer Language Benchmarks Game
http://shootout.alioth.debian.org/

Project for reviewing/updating php programs

Results:

Calculate the digits of Pi with streaming arbitrary-precision arithmetic - pidigits

1.63x speedup - from 4.56 sec to 2.8 sec

Changes:

• global variables are used for temporary values instead of arrays
• functions are inlined
• count of math operations is reduced
• functions return simple values instead of arrays
• output buffering is optimized

implementation based/ported from lua-5 version

array permutations - fannkuch-redux - single core version

1.31x speedup - from 59 min to 45 min

Changes:

• deep optimization of code - references, faster incrementors, avoiding double-counting of indexes

array permutations - fannkuch-redux - multi core version

5.36x speedup - from 59 min to 11 min

Changes:

• algorithm is based on multicore Java 6 source code by Oleg Mazurov
• multi-core support for PHP is based on mandelbrot.php-3