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Search: Posts Made By: paulunderwood
Forum: Riesel Prime Search 2022-01-18, 23:36
Replies: 298
Views: 53,710
Posted By paulunderwood
Congrats to PrimeGrid for the "321" prime...

Congrats to PrimeGrid for the "321" prime 3*2^18196595 - 1 (https://primes.utm.edu/primes/page.php?id=133193) (5,477,722 decimal digits, rank 20) :banana:
Forum: Hardware 2022-01-18, 13:09
Replies: 99
Views: 11,072
Posted By paulunderwood
I have a spare original AMD 1090t CPU fan and...

I have a spare original AMD 1090t CPU fan and heat sink that has not been used much at all as I went for an after market one. It just needs locating in a box and I am willing to post it to you...
Forum: Programming 2022-01-17, 20:19
Replies: 13
Views: 301
Posted By paulunderwood
Nice one. :tu: I had narrowed it down to a...

Nice one. :tu: I had narrowed it down to a problem with SOE.
Forum: Riesel Prime Search 2022-01-17, 13:16
Replies: 76
Views: 29,302
Posted By paulunderwood
Another smaller one: 69 * 2^13832885 - 1...

Another smaller one: 69 * 2^13832885 - 1 (https://primes.utm.edu/primes/page.php?id=133178) (4,164,116 decimal digits) :banana:
Forum: Programming 2022-01-17, 12:18
Replies: 13
Views: 301
Posted By paulunderwood
primes[] is assigned 0 and 1 which are 4 bytes --...

primes[] is assigned 0 and 1 which are 4 bytes -- char is 1 byte.

To save save memory space the coder could use char and assign and test '0' and '1'. Or use a smaller integer type.
Forum: Programming 2022-01-17, 08:08
Replies: 13
Views: 301
Posted By paulunderwood
I changed to primes = malloc(sizeof(int) *...

I changed to primes = malloc(sizeof(int) * sieve_depth); and now get no errors
Forum: Programming 2022-01-17, 07:39
Replies: 13
Views: 301
Posted By paulunderwood
I get "corrupted size vs. prev_size" which means...

I get "corrupted size vs. prev_size" which means you have a memory leak somewhere caused by out-of-bounds access.
Forum: Programming 2022-01-17, 06:26
Replies: 13
Views: 301
Posted By paulunderwood
gcc -v Using built-in specs. COLLECT_GCC=gcc ...

gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/11/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none:amdgcn-amdhsa
OFFLOAD_TARGET_DEFAULT=1
Target:...
Forum: Programming 2022-01-16, 22:12
Replies: 13
Views: 301
Posted By paulunderwood
How is index controlled? It might be easier...

How is index controlled?

It might be easier to debug if you attached the whole program.
Forum: Hardware 2022-01-16, 17:47
Replies: 99
Views: 11,072
Posted By paulunderwood
:lol: I guess it is an after market fan because...

:lol: I guess it is an after market fan because the originals scream a bit under full load. Have you considered replacing the fan component?
Forum: XYYXF Project 2022-01-15, 22:42
Replies: 487
Views: 110,221
Posted By paulunderwood
Congrats! No. PFGW ran successfully...

Congrats!



No. PFGW ran successfully with a bigger FFT size using -a1 :smile:
Forum: Probability & Probabilistic Number Theory 2022-01-15, 16:57
Replies: 15
Views: 3,066
Posted By paulunderwood
I can now clarify. Take the example n=2499327041...

I can now clarify. Take the example n=2499327041 with 30258 P <= (n-1)/2 values that give rise to counterexamples. The multiplicative order of 2 is 560 meaning a single 2^r solution would give rise...
Forum: Forum Feedback 2022-01-13, 15:22
Replies: 11
Views: 335
Posted By paulunderwood
Firefox too, but it is an attachment!

Firefox too, but it is an attachment!
Forum: Hardware 2022-01-13, 15:11
Replies: 27
Views: 6,800
Posted By paulunderwood
For wavefront Mersenne testing, the 3990x is best...

For wavefront Mersenne testing, the 3990x is best suited to running 8 workers -- there are 8 chiplets in this architecture. Only for huge FFT work does it make sense to use fewer workers.
Forum: Hardware 2022-01-11, 15:38
Replies: 25
Views: 808
Posted By paulunderwood
PFGW, like all GWNUM-based software, benefits...

PFGW, like all GWNUM-based software, benefits from AVX2 which the Celeron chip lacks.
Forum: Riesel Prime Search 2022-01-10, 22:39
Replies: 298
Views: 53,710
Posted By paulunderwood
Sniped! :snipe:

Sniped! :snipe:
Forum: Riesel Prime Search 2022-01-10, 19:42
Replies: 298
Views: 53,710
Posted By paulunderwood
288465! + 1

Congrats to René Dohmen for the new factorial prime 288465! + 1 (https://primes.utm.edu/primes/page.php?id=133139) (1,449,771 decimal digits) :banana:
Forum: And now for something completely different 2022-01-10, 12:19
Replies: 93
Views: 27,950
Posted By paulunderwood
It is still in phase 1. That should be done...

It is still in phase 1. That should be done within a week. I reckon phase 2 will take a few weeks and the certificate verification about a full day.
Forum: And now for something completely different 2022-01-09, 23:51
Replies: 93
Views: 27,950
Posted By paulunderwood
R49081 is actually down to 62k bits and phase 2...

R49081 is actually down to 62k bits and phase 2 has to be run yet, plus a verification of the certificate. So it could be another month. I hope this 18 month run will be tickety-boo on a machine...
Forum: Hardware 2022-01-09, 06:53
Replies: 25
Views: 808
Posted By paulunderwood
This 10400f ...

This 10400f ...
Forum: Hardware 2022-01-09, 06:41
Replies: 25
Views: 808
Posted By paulunderwood
AVX2 is 2x faster (?). If you are looking for a...

AVX2 is 2x faster (?). If you are looking for a bargain, a cheap system built around this 9400f chip...
Forum: Hardware 2022-01-09, 06:22
Replies: 25
Views: 808
Posted By paulunderwood
Not a wise choice for crunching large numbers....

Not a wise choice for crunching large numbers. During heavy use heat dissipation would be a problem. The Celeron does not have AVX/AVX2.
Forum: Probability & Probabilistic Number Theory 2022-01-07, 22:32
Replies: 15
Views: 3,066
Posted By paulunderwood
I am still gathering data, but post #1 has been...

I am still gathering data, but post #1 has been updated with the latest paper. The idea of segmenting P is introduced with the idea of unlikely geometric progression of passes of the test. I also...
Forum: And now for something completely different 2022-01-02, 09:57
Replies: 93
Views: 27,950
Posted By paulunderwood
It is imminent. A week or so. :smile:

It is imminent. A week or so. :smile:
Forum: Factoring 2021-12-29, 00:29
Replies: 1
Views: 304
Posted By paulunderwood
X=Mod(2,n);g=1;c=1;while(g==1,c++;X=X^c;g=gcd(X-1,...

X=Mod(2,n);g=1;c=1;while(g==1,c++;X=X^c;g=gcd(X-1,n));lift(g) ...
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