Pollard Rho is extremely inconsistent in its timings. I wouldn't read too
much into the factorisation of a single number unless you know for sure
that precisely the same computations are being performed internal to the
algorithm.

Bill.

On 1 July 2016 at 03:13, Doug Telford <d...@dougtelford.com> wrote:

> This post updates a previous post, which had several errors.
>
> The benchmark is a Pollard rho factorization program.  The number to
> factor has 34 digits.
>
> 1. Windows 10 C# Mpir.Net arithmetic expressions (v =(v * v + a) % n)  :
> 614 seconds
>
> 2. Windows 10 C# Mpir.Net mpz_ expressions (mpz_add(v, a, v)) :68 seconds
>
> 3. Windows 10 Free Pascal uses interface to mpir.dll : 45 seconds
>
> 4. Ubuntu 15.10 (Linux) Free pascal uses libgmp : 31 seconds
>
> 5. Ubuntu 15.10 (Linux) gcc uses libgmp :  27 seconds
>
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