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Forum: Cunningham Tables 2021-01-14, 14:50
Replies: 218
Views: 36,209
Posted By charybdis
My machines are up and running. ...

My machines are up and running.



Adjust-strategy 2 does use a bit more memory than the default, but each process should still fit within 4GB.
Forum: Factoring 2021-01-12, 21:13
Replies: 888
Views: 70,154
Posted By charybdis
Another suggestion: if the huge volume of...

Another suggestion: if the huge volume of relations is posing problems for msieve, then you could try turning this into a 33/35 job by removing all the relations with 36-bit algebraic factors using...
Forum: Cunningham Tables 2021-01-12, 17:20
Replies: 218
Views: 36,209
Posted By charybdis
The best from my run, by some margin, is n:...

The best from my run, by some margin, is
n:...
Forum: NFS@Home 2021-01-12, 17:15
Replies: 90
Views: 6,117
Posted By charybdis
It's natural log. PNT says the probability that n...

It's natural log. PNT says the probability that n is prime is ~1/log(n), so C/log(Q) is indeed the expected number of primes in the range.
Forum: Factoring 2021-01-11, 23:07
Replies: 888
Views: 70,154
Posted By charybdis
According to jasonp the CADO filtering format has...

According to jasonp the CADO filtering format has changed (https://mersenneforum.org/showthread.php?t=22624) since that code was written. An old version of CADO could work but I don't know whether it...
Forum: Cunningham Tables 2021-01-11, 20:19
Replies: 218
Views: 36,209
Posted By charybdis
Got the go-ahead from Sam. :smile: I'll do...

Got the go-ahead from Sam. :smile:

I'll do P=5M, admax=10M, incr=420.
Forum: Cunningham Tables 2021-01-11, 19:42
Replies: 218
Views: 36,209
Posted By charybdis
Done. I suppose it's possible he's already...

Done. I suppose it's possible he's already started working on it himself and just hasn't got round to updating the reservation page, so I'll keep everyone updated.

What parameters are you using...
Forum: Cunningham Tables 2021-01-11, 19:17
Replies: 218
Views: 36,209
Posted By charybdis
Sam Wagstaff just knocked 2,2390M down to c191...

Sam Wagstaff just knocked 2,2390M down to c191 with ECM.
No-one has reserved it yet - could this be a target for a short forum team sieve?
Forum: Factoring 2021-01-11, 17:58
Replies: 888
Views: 70,154
Posted By charybdis
Seems worrying that it's stuck at 2-way merge...

Seems worrying that it's stuck at 2-way merge rather than full merge. A bug in msieve, perhaps?

Also I'm thinking "well over 100M" may be an understatement...
Forum: NFS@Home 2021-01-10, 21:53
Replies: 90
Views: 6,117
Posted By charybdis
This is to be expected in general. The noise in...

This is to be expected in general. The noise in the yield comes from the number of special-q in a range deviating from the expectation. The number of special-q for a given prime is the number of...
Forum: NFS@Home 2021-01-10, 03:26
Replies: 90
Views: 6,117
Posted By charybdis
I'm very surprised if -r side is faster. Are you...

I'm very surprised if -r side is faster. Are you sure you didn't make an error when testing?
Forum: Factoring 2021-01-09, 22:14
Replies: 888
Views: 70,154
Posted By charybdis
That looks promising; still can't rule out msieve...

That looks promising; still can't rule out msieve getting stuck in merge for an age before spitting out "too few cycles, matrix probably cannot build", but if that happens then a lower TD or more...
Forum: Aliquot Sequences 2021-01-07, 13:06
Replies: 2,934
Views: 182,365
Posted By charybdis
Very nice! I won't be doing any more searching.

Very nice!
I won't be doing any more searching.
Forum: Aliquot Sequences 2021-01-06, 14:51
Replies: 2,934
Views: 182,365
Posted By charybdis
Nothing exceptional from CADO, but here are the...

Nothing exceptional from CADO, but here are the top 5:

skew: 31667446.08
c0: 635181421872748933108441699486115427125642808
c1: -74986650995391412139123003935796048006
c2:...
Forum: Aliquot Sequences 2021-01-05, 21:22
Replies: 2,934
Views: 182,365
Posted By charybdis
I'm happy to leave this one to NFS@home unless...

I'm happy to leave this one to NFS@home unless there's more interest in a quick team-sieve.

We need a polynomial in any case, so I'm starting a CADO run with P=4M, admax=10M, incr=420. Help is...
Forum: Aliquot Sequences 2021-01-05, 19:58
Replies: 2,934
Views: 182,365
Posted By charybdis
t55 + just over half t60 complete on the c189. ...

t55 + just over half t60 complete on the c189.

Is there any interest in getting GNFS done? If so, I'll run some CADO polyselect.
Forum: Puzzles 2021-01-04, 21:54
Replies: 13
Views: 467
Posted By charybdis
Not sure if this counts as elegant: Suppose...

Not sure if this counts as elegant:

Suppose n = ab where b>1 is odd. Then when we write n = a+...+a, one of the a's is in the middle, so we can easily rewrite this as a sum of consecutive...
Forum: Factoring 2021-01-04, 13:32
Replies: 888
Views: 70,154
Posted By charybdis
The siever runs just fine with Q > 2^32. There is...

The siever runs just fine with Q > 2^32. There is a flag "SUPPORT_LARGE_Q" which is needed to support Q-lattice basis coordinates larger than 2^31. For this job the basis coordinates are more like...
Forum: Aliquot Sequences 2021-01-03, 20:37
Replies: 2,934
Views: 182,365
Posted By charybdis
i12574

Now on a c189.
I've run just under half a t50 so far, so if anyone wants to run ECM it would be best to start at the 55-digit level or higher.
Forum: Aliquot Sequences 2021-01-02, 13:15
Replies: 2,934
Views: 182,365
Posted By charybdis
Next line has a c159, running GNFS now.

Next line has a c159, running GNFS now.
Forum: Aliquot Sequences 2021-01-02, 13:12
Replies: 463
Views: 38,833
Posted By charybdis
And now a further 3500@40e7, 6700@65e7 and...

And now a further 3500@40e7, 6700@65e7 and 3900@12e8.
In hindsight it might have been better for me to stick to 40/42e7 and for Yoyo to start at 85e7, but I expected Yoyo would have got going by...
Forum: XYYXF Project 2020-12-31, 16:54
Replies: 13
Views: 745
Posted By charybdis
This is a standalone one-pass duplicate relations...

This is a standalone one-pass duplicate relations remover;
only syntax (a,b:<csv-of-factors>:<csv-of-factors>) is checked and incomplete lines are discarded;
validity of relations is...
Forum: Hardware 2020-12-31, 16:48
Replies: 4
Views: 288
Posted By charybdis
I presume your system has 24 physical cores with...

I presume your system has 24 physical cores with hyperthreading.

Setting

will run 24 processes for most of the factorization, and unless you force factmsieve.py to only use 12 physical cores,...
Forum: XYYXF Project 2020-12-31, 14:57
Replies: 13
Views: 745
Posted By charybdis
I've spent a fair amount of time browsing old...

I've spent a fair amount of time browsing old threads here, and from what I recall, at least some cases of the bug were caused by the GGNFS siever occasionally producing relations with composite...
Forum: Aliquot Sequences 2020-12-30, 23:05
Replies: 463
Views: 38,833
Posted By charybdis
Thanks - I hadn't properly taken on board that...

Thanks - I hadn't properly taken on board that Yoyo is running more than a full t60.
I've done 1900@42e7 so far, as well as 300@40e7 on some memory-limited machines. Switching most machines to...
Showing results 1 to 25 of 165

 
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