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    <p>Robert Gould > <em>One of those is the mandelbrot test (Generate Mandelbrot set portable bitmap file N=16,000), where it scores a horrible 1:109</em></p> <p>When you quote numbers from the benchmarks game please show where those numbers come from so readers have some context.</p> <p>In this case you seem to have taken numbers measured on the quadcore machine where the fastest programs have been re-written to exploit multiple cores. Instead of looking at elapsed time <a href="http://shootout.alioth.debian.org/u32q/benchmark.php?test=mandelbrot&amp;lang=all&amp;sort=fullcpu" rel="nofollow noreferrer">sort by CPU time and you'll see the ratio drop to <strong>1:28</strong></a>.</p> <p>Or look at the median and quartiles to get a better impression of <a href="http://shootout.alioth.debian.org/u32/benchmark.php?test=all&amp;lang=all&amp;d=data&amp;gpp=on&amp;gcc=on&amp;luajit=on&amp;lua=on&amp;calc=calculate&amp;box=1" rel="nofollow noreferrer">how the set of C++ measurements compares to the set of Lua measurements</a>.</p> <p>Or there's a whole set of measurements where programs are forced to use just one core - <a href="http://shootout.alioth.debian.org/u32/benchmark.php?test=all&amp;lang=lua&amp;lang2=gpp&amp;box=1" rel="nofollow noreferrer">Lua compared with C++</a> - and if you take a look at <a href="http://shootout.alioth.debian.org/u32/benchmark.php?test=pidigits&amp;lang=lua&amp;id=1" rel="nofollow noreferrer">those Lua <strong>pi-digits</strong> programs</a> you'll see that they use the C language GNU GMP library.</p>
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    1. POLua Challenge: Can you improve the mandelbrot implementation’s performance?
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    1. COSo far Mandrelbot program performance has been halved. And it wasn't hard at all...
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    2. CODo you think the programs still follow the benchmarks game "rules" for mandelbrot? (Hint - doing half the work by exploiting symmetry won't be accepted.)
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    3. COThis is not the shoot out game. It's about optimizing an algorithm in lua without requiring extra dependencies on the core or plugins,
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