[racket] slow g^x=h mod p meet in the middle code

On Thu, 27 Feb 2014 23:29:36 +0200, Eric Dong <yd2dong at uwaterloo.ca> wrote:

> I have a 2.4 GHz machine (n-core does not matter; Racket only uses one
> core), and I get
>
> cpu time: 25228 real time: 25202 gc time: 18840
>
> on Linux x86. Are you sure you ran the "Rackety" program Matthias posted?

On Linux x64 Debian 6 compiled from source
=============================================

with ../configure --prefix=/opt/racket is much faster than on Windows 7  
x64 precompiled (mingw I think)
cpu time: 42066 real time: 42050 gc time: 31390

Senora
cpu time: 42030 real time: 42023 gc time: 31485

CGC
cpu time: 20857 real time: 20881 gc time: 14333

There are issues with permissions after sudo make install.
With Senora and CGC build there are more issues with the installation.
CGC install can't compile or find all collections.

On Windows7 x64
===============
precompiled racket 6.0 for x64 in command line
cpu time: 132039 real time: 135030 gc time: 107431

racket cgc compiled from source x64 on windows x64 with visual c++ 10
cpu time: 22651 real time: 23869 gc time: 15583

JAVA
=======
Java6 x64 on Linux x64 Debian 6:
solution = 375374217830
elapsed time 10926

Java7 x64 on Windows 7 x64
solution = 375374217830
elapsed time 10926
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