Tiny Mersenne Twister original code with TinyMT-Jump
C++ C
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TinyMT - Tiny Mersenne Twister

A 2^127-1 period PRNG


  • TinyMT-src and TinyMT-Jump (1.1) both pieces of codes are merged.

  • This git repository includes mods for FreeBSD 8. For compilation on FreeBSD 8, gcc 4.5 or later is required. The following example shows a configuration for gcc 4.6 (port lang/gcc46) for /etc/libmap.conf:

      ## for gcc46
      libstdc++.so.6                  gcc46/libstdc++.so.6
  • The stock gcc of FreeBSD 8 (4.2.1) causes the following problems:

    • floating point handling error when testing tinymt/ generated sequences
    • does not compile the C++ code under dc/

What is Tiny Mersenne Twister

(as described in http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/TINYMT/index.html)

TinyMT is a new small-sized variant of Mersenne Twister (MT) introduced by Mutsuo Saito and Makoto Matsumoto in 2011. There are two types of TinyMT, tinymt32 and tinymt64. tinymt32 outputs 32-bit unsigned integers and single precision floating point numbers. On the other hand, tinymt64 outputs 64-bit unsigned integers and double precision floating point numbers.

The purpose of TinyMT is not to replace Mersenne Twister. TinyMT has far shorter period than Mersenne Twister. The merit of TinyMT is in its small size of the internal state of 127 bits, far smaller than 19937 of Mersenne Twister. The purpose of TinyMT may be used in a situation where large state generators such as Mersenne Twister are difficult to use. According to statistical test (BigCrush), the quality of the outputs of TinyMT seems pretty good, taking the small size of the internal state into consideration.

TinyMT features

  • The periods of generated sequences are 2^127-1
  • The size of internal state space is 127 bits
  • The state transition function is F2-linear
  • The output function is not F2-linear
  • TinyMTDC generates distinct parameter sets for TinyMT
  • TinyMTDC can generate a large number of parameter sets (over 232 x 216)
  • Parameter generation of TinyMTDC is fast