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Search took 0.30 seconds. Search: Posts Made By: paulunderwood
Forum: And now for something completely different 2022-05-21, 06:11
Replies: 108
Views: 4,761
Posted By paulunderwood
Have you tried recompiling the code in the...

Have you tried recompiling the code in the cm_nt_next_prime function within lib/nt.c with:

#ifdef WITH_MPI
// static unsigned long int P [664579];
// /* primes up to 10^7 */
static...
Forum: Puzzles 2022-05-20, 16:15
Replies: 27
Views: 12,163
Posted By paulunderwood
\[2^{\aleph_0} - 1 = \aleph_1\] and I am not sure...

\[2^{\aleph_0} - 1 = \aleph_1\] and I am not sure primeness is defined for these.
Forum: And now for something completely different 2022-05-20, 15:00
Replies: 108
Views: 4,761
Posted By paulunderwood
FastECPP + GWNUM Version 2

I have made a number of changes gw_prp.c (attached):


mpz strings are now base 16 for the system call to gw_prp

added bound check for A in the calculation on the discriminant D

used mpz...
Forum: Puzzles 2022-05-20, 02:14
Replies: 27
Views: 12,163
Posted By paulunderwood
https://en.wikipedia.org/wiki/Schr%C3%B6der%E2%80%...

https://en.wikipedia.org/wiki/Schr%C3%B6der%E2%80%93Bernstein_theorem
Forum: And now for something completely different 2022-05-19, 17:57
Replies: 108
Views: 4,761
Posted By paulunderwood
I'd say 4-5 months on 1024 cores with my above...

I'd say 4-5 months on 1024 cores with my above hack.

You'd need to increase the char array size!
Forum: And now for something completely different 2022-05-19, 10:13
Replies: 108
Views: 4,761
Posted By paulunderwood
I can't impress enough the usefulness of this...

I can't impress enough the usefulness of this hack. The threshold of ~26000 bits is optimal. At 44497 bits it is 30% quicker. Considering most of the time is spent at larger bit levels the hack could...
Forum: And now for something completely different 2022-05-19, 00:22
Replies: 108
Views: 4,761
Posted By paulunderwood
I queried the threshold for a system() call out...

I queried the threshold for a system() call out at 30000 bits. With some more testing 26000 is more optimal -- I will make the change to the original post.
Forum: And now for something completely different 2022-05-18, 17:07
Replies: 108
Views: 4,761
Posted By paulunderwood
Are there any hidden characters in the input...

Are there any hidden characters in the input number? This can sometimes happen when pasting web copied stuff.
Forum: And now for something completely different 2022-05-18, 15:33
Replies: 108
Views: 4,761
Posted By paulunderwood
Was your inputted number a PRP? What command...

Was your inputted number a PRP?

What command did you issue?

Maybe you should run make clean; make; sudo make install
Forum: And now for something completely different 2022-05-18, 00:49
Replies: 108
Views: 4,761
Posted By paulunderwood
FastECPP + GWNUM

The attached code can be compiled with GWNUM (after that has compiled from P95 source) in the P95 directory

Then make the change to lib/nt.c of CM (FastECCP code):

int cm_nt_is_prime (mpz_t a)...
Forum: And now for something completely different 2022-05-16, 11:09
Replies: 108
Views: 4,761
Posted By paulunderwood
I tried unsuccessfully to get a return value from...

I tried unsuccessfully to get a return value from a system call to pfgw.

Now i have written gwnum code, but have no idea where to add a link to gwnum.a when compiling through the makefile system....
Forum: And now for something completely different 2022-05-13, 18:29
Replies: 108
Views: 4,761
Posted By paulunderwood
(FactorDB)

(FactorDB)
Forum: And now for something completely different 2022-05-13, 12:55
Replies: 108
Views: 4,761
Posted By paulunderwood
One might have to type...

One might have to type 'print(fibonacci(37217)/4466041)' to avoid trucation by Pari/GP. I certainly get truncation with echo fibonacci(37217)/4466041 | gp -q but maybe it works with the -n switch on...
Forum: And now for something completely different 2022-05-11, 19:43
Replies: 108
Views: 4,761
Posted By paulunderwood
I noticed that some numbers stall the program,...

I noticed that some numbers stall the program, like (10^79-1)/9. Primo does a BPSW sanity test before ECPP.

@Serge: The 50001 digit ECPP proof is still not in the UTM database. You had better ask...
Forum: Programming 2022-05-11, 00:37
Replies: 12
Views: 504
Posted By paulunderwood
Here is a perl script. usage: perl myscript.pl...

Here is a perl script. usage: perl myscript.pl input_file worker_count > output_file

open(fh,"<",$ARGV[0]);
$count=0;
while(<fh>){$count++;}
close(fh);

open(fh,"<",$ARGV[0]);...
Forum: And now for something completely different 2022-05-10, 15:57
Replies: 108
Views: 4,761
Posted By paulunderwood
questions about mpirun ecpp-mpi

Regarding mpi, can ecpp-mpi be run on non-uniform processors on a network. Can clients drop out without affecting the server? Likewise, can clients be added at runtime?

As far as I can tell, the...
Forum: And now for something completely different 2022-05-10, 12:42
Replies: 4
Views: 98
Posted By paulunderwood
One thing you could do is to use the meta...

One thing you could do is to use the meta keywords in your page.
Forum: Programming 2022-05-10, 11:17
Replies: 12
Views: 504
Posted By paulunderwood
Windows or Linux? What is your preferred...

Windows or Linux? What is your preferred (scripting) language?
Forum: And now for something completely different 2022-05-09, 18:20
Replies: 108
Views: 4,761
Posted By paulunderwood
Perhaps EdH can give us a synopsis on how to run...

Perhaps EdH can give us a synopsis on how to run client boxes.
Forum: And now for something completely different 2022-05-09, 16:48
Replies: 108
Views: 4,761
Posted By paulunderwood
Can you run?: adduser stargate38 su...

Can you run?:

adduser stargate38
su stargate38
Forum: And now for something completely different 2022-05-09, 00:27
Replies: 108
Views: 4,761
Posted By paulunderwood
LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib ...

LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib
export LD_LIBRARY_PATH


HTH.

Note ecpp, as opposed to ecpp-mpi, is single threaded. Your next step will be to get mpi running.
Forum: And now for something completely different 2022-05-08, 22:33
Replies: 108
Views: 4,761
Posted By paulunderwood
Even I managed to get mpirun ecpp-mpi -g -n...

Even I managed to get mpirun ecpp-mpi -g -n '(10^1031-1)/9' -c -f cert-1031 working, after downloading, compiling and installing mpfrcx-0.6.3; and configuring ecpp-mpi with the right flag to...
Forum: And now for something completely different 2022-05-08, 15:13
Replies: 108
Views: 4,761
Posted By paulunderwood
What is stopping Marcel Martin studying the...

What is stopping Marcel Martin studying the source of FastECPP to improve Primo?
Forum: And now for something completely different 2022-05-08, 03:52
Replies: 108
Views: 4,761
Posted By paulunderwood
I am sticking wih Primo for now. A) I have...

I am sticking wih Primo for now. A) I have started a couple numbers on my 3990x and B) running two numbers seems to keep all cores busy.
Forum: Flea Market 2022-05-07, 22:13
Replies: 5
Views: 5,257
Posted By paulunderwood
Viliam Furík has a Radeon VII on sale for $750...

Viliam Furík has a Radeon VII on sale for $750 USD including delivery woldwide (https://mersenneforum.org/showpost.php?p=605445&postcount=374).
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