On Mar 13, 12:12 am, Cactus <rieman...@googlemail.com> wrote:
> On Mar 12, 5:31 pm, Cactus <rieman...@googlemail.com> wrote:
>
>
>
> > On Mar 12, 5:11 pm, Jeff Gilchrist <jeff.gilchr...@gmail.com> wrote:
>
> > > On Thu, Mar 12, 2009 at 1:02 PM, Cactus <rieman...@googlemail.com> wrote:
> > > > If the parameters change a lot I have found it necessary to repeat the
> > > > process to get the best parameters.
>
> > > The numbers keep changing so it is hard to tell which one is "best".
>
> > > > None of the Windows 32-bit parameter files have changed in several
> > > > years so it will be interesting to see how much difference there is.
>
> > > The current params file is very basic, it only contains a couple of
> > > options:
> > > #ifndef BITS_PER_MP_LIMB
> > > #define BITS_PER_MP_LIMB 32
> > > #elif BITS_PER_MP_LIMB != 32
> > > #error Bad configuration in gmp-mparam.h
> > > #endif
>
> > > #ifndef BYTES_PER_MP_LIMB
> > > #define BYTES_PER_MP_LIMB 4
> > > #elif BYTES_PER_MP_LIMB != 4
> > > #error Bad configuration in gmp-mparam.h
> > > #endif
>
> > > /* Generic x86 mpn_divexact_1 is faster than generic x86 mpn_divrem_1 on
> > > all
> > > of p5, p6, k6 and k7, so use it always. It's probably slower on 386
> > > and
> > > 486, but that's too bad. */
> > > #define DIVEXACT_1_THRESHOLD 0
>
> > > This is what tune generated on the 5th run for me (this is a 65nm
> > > Core2 using the 32bit p4 code):
>
> > > /* Generated by tuneup.c, 2009-03-12, system compiler */
>
> > > #define MUL_KARATSUBA_THRESHOLD 24
> > > #define MUL_TOOM3_THRESHOLD 161
>
> > > #define SQR_BASECASE_THRESHOLD 0 /* always (native) */
> > > #define SQR_KARATSUBA_THRESHOLD 42
> > > #define SQR_TOOM3_THRESHOLD 161
>
> > > #define MULLOW_BASECASE_THRESHOLD 8
> > > #define MULLOW_DC_THRESHOLD 92
> > > #define MULLOW_MUL_N_THRESHOLD 486
>
> > > #define DIV_SB_PREINV_THRESHOLD 0 /* always */
> > > #define DIV_DC_THRESHOLD 64
> > > #define POWM_THRESHOLD 146
>
> > > #define GCD_ACCEL_THRESHOLD 12
> > > #define GCDEXT_THRESHOLD 21
> > > #define JACOBI_BASE_METHOD 1
>
> > > #define USE_PREINV_DIVREM_1 1
> > > #define USE_PREINV_MOD_1 1
> > > #define DIVREM_2_THRESHOLD 0 /* always */
> > > #define DIVEXACT_1_THRESHOLD 0 /* always (native) */
> > > #define MODEXACT_1_ODD_THRESHOLD 0 /* always (native) */
>
> > > #define GET_STR_DC_THRESHOLD 20
> > > #define GET_STR_PRECOMPUTE_THRESHOLD 23
> > > #define SET_STR_THRESHOLD 6418
>
> > > #define MUL_FFT_TABLE { 496, 1184, 1920, 5632, 14336, 40960, 0 }
> > > #define MUL_FFT_MODF_THRESHOLD 512
> > > #define MUL_FFT_THRESHOLD 3328
>
> > > #define SQR_FFT_TABLE { 528, 1184, 2432, 5632, 14336, 40960, 0 }
> > > #define SQR_FFT_MODF_THRESHOLD 544
> > > #define SQR_FFT_THRESHOLD 3840
>
> > > /* Tuneup completed successfully, took 9 seconds */
>
> > My guess is that they won't then make much difference.
>
> > I often find that tune results are not optimal and I can get more by
> > tweaking the resulting values.
>
> > But its time consuming so I don't recommend this unless you have a lot
> > of time to spare :-)
>
> I have updated run-speed.py because Bill found some bugs on Linux. So
> download it again if you are going to try it.
>
I have updated it again today (14 March) to increase its coverage.
Brian
> Brian
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