Factor found on M809 - Page 2

Prime95 · 2003-02-28, 01:04

Has anyone tried doing stage 1 prime95 and stage 2 in ecm-gmp 5.0? Ecm-gmp has a vastly superior stage 2.

Even better for the ambitious reader would be taking the ecm-gmp sources and integrating the mprime FFT routines.

pakaran · 2003-02-28, 17:31

Is it safe to assume this is far more than a "cut and paste"?

Also, would the GMP-ECM folks mind the loss of portability?

Prime95 · 2003-02-28, 18:21

Quote:

Originally Posted by pakaran

Is it safe to assume this is far more than a "cut and paste"?

Yes, changing the source code would be tricky.

As to running stage 1 in prime95/mprime and stage 2 in ecm-gmp that shouldn't be too much harder than some cut/paste/scripts. The hooks are in prime95 to output the stage 1 result, and I asked Paul to implement a hook to accept a stage 1 result and only run stage 2.

ecm-gmp's stage 2 is more than twice as effective at finding factors than prime95.

pakaran · 2003-02-28, 18:58

Thanks for the quick reply George.

I know little about C and ASM beyond what I learned in my 300-level programming languages course, so I guess I'm not the one to do it :(.

QuintLeo · 2003-02-28, 21:27

Is there any reason the more effective Phase 2 code couldn't be implimented in a future version of Prime95?

Does it take longer than the current Prime code?

smh · 2003-03-01, 13:51

Quote:

Originally Posted by Prime95

Has anyone tried doing stage 1 prime95 and stage 2 in ecm-gmp 5.0? Ecm-gmp has a vastly superior stage 2.

I'm still looking for a windows binary (pref. an optimized P4 version).

Anyone out there who has one ?

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2003-02-28, 01:04	#12
Prime95 P90 years forever! Aug 2002 Yeehaw, FL 2×53×71 Posts	Has anyone tried doing stage 1 prime95 and stage 2 in ecm-gmp 5.0? Ecm-gmp has a vastly superior stage 2. Even better for the ambitious reader would be taking the ecm-gmp sources and integrating the mprime FFT routines.

2003-02-28, 17:31	#13
pakaran Aug 2002 3×83 Posts	Is it safe to assume this is far more than a "cut and paste"? Also, would the GMP-ECM folks mind the loss of portability?

2003-02-28, 18:58	#15
pakaran Aug 2002 3×83 Posts	Thanks for the quick reply George. I know little about C and ASM beyond what I learned in my 300-level programming languages course, so I guess I'm not the one to do it :(.

2003-02-28, 21:27	#16
QuintLeo Oct 2002 Lost in the hills of Iowa 2⁶×7 Posts	Is there any reason the more effective Phase 2 code couldn't be implimented in a future version of Prime95? Does it take longer than the current Prime code?