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Forum: CADO-NFS 2021-10-22, 23:33
Replies: 72
Views: 13,341
Posted By charybdis
This will be a consequence of CADO sieving below...

This will be a consequence of CADO sieving below the FB bound. As soon as Q goes above lim1, the probability that a new relation is a duplicate of a previous one drops: for example, if you're using...
Forum: Cunningham Tables 2021-10-22, 12:09
Replies: 132
Views: 34,254
Posted By charybdis
Server seems to have been down for a while?

Server seems to have been down for a while?
Forum: Cunningham Tables 2021-10-21, 11:11
Replies: 132
Views: 34,254
Posted By charybdis
Thank you! :smile: One more thing: the next...

Thank you! :smile:

One more thing: the next time you restart the server, maybe to add adjust_strategy back in at 120M, it would be a good idea to change tasks.maxtimedout and tasks.maxfailed from...
Forum: Cunningham Tables 2021-10-21, 00:15
Replies: 132
Views: 34,254
Posted By charybdis
I've spotted an oddity: adjust_strategy=2 appears...

I've spotted an oddity: adjust_strategy=2 appears to be clearly worse until just above Q=120M. I haven't seen this happen before; perhaps it's a consequence of the high skew? In any case, I'd suggest...
Forum: Factoring 2021-10-19, 13:43
Replies: 60
Views: 4,315
Posted By charybdis
Indeed lambda is applied before the size of the...

Indeed lambda is applied before the size of the cofactor is known exactly - as you're probably aware, some crude but clever approximations are used for log2 during sieving.

I don't know why...
Forum: Cunningham Tables 2021-10-19, 12:44
Replies: 132
Views: 34,254
Posted By charybdis
Thanks Oliver for getting everything set up! ...

Thanks Oliver for getting everything set up!

Using commit 9e81c910 isn't essential, but I would highly recommend that everyone upgrades to it, because it speeds up sieving by several percent...
Forum: Factoring 2021-10-19, 10:37
Replies: 60
Views: 4,315
Posted By charybdis
Worth noting here that adding 1 to each mfb may...

Worth noting here that adding 1 to each mfb may do basically nothing if the lambdas are too small. Maybe add 0.05 to each lambda at the same time.
Forum: Factoring 2021-10-18, 22:38
Replies: 60
Views: 4,315
Posted By charybdis
For GNFS it appears to be in the high 160s, so...

For GNFS it appears to be in the high 160s, so there's probably a way to go. CADO will always give higher duplication rates than ggnfs because it sieves below the FB bound.
Forum: Factoring 2021-10-18, 20:51
Replies: 60
Views: 4,315
Posted By charybdis
The E score for this number would be more typical...

The E score for this number would be more typical for GNFS ~c146 (comparison is fine assuming you're still using deg 5) so your lims, lpbs and mfbs may be on the small side. As henryzz alluded to, at...
Forum: Aliquot Sequences 2021-10-16, 17:21
Replies: 136
Views: 45,634
Posted By charybdis
Agreed. This is over 3 times harder than 3,748+...

Agreed. This is over 3 times harder than 3,748+ so let's get that done first.

Alternatively Ryan and Greg could probably factor this number in under 2 weeks if they want.
Forum: Homework Help 2021-10-15, 16:30
Replies: 14
Views: 783
Posted By charybdis
I can't think of any cases where this would be...

I can't think of any cases where this would be useful for the numbers that we usually run SNFS on. You can't just switch out the linear polynomial for a quadratic one. The solution (as far as it is...
Forum: Homework Help 2021-10-14, 14:37
Replies: 14
Views: 783
Posted By charybdis
It is not an equation. It is a polynomial. An...

It is not an equation. It is a polynomial. An equation implies that two things are being equated. A polynomial does not contain an equals sign.

I'm not sure what you're asking. The linear...
Forum: CADO-NFS 2021-10-13, 00:44
Replies: 3
Views: 311
Posted By charybdis
CADO does use GMP, but if a new GMP version...

CADO does use GMP, but if a new GMP version caused issues I seriously doubt they would be server issues. What CADO revision are you running?
Forum: Aliquot Sequences 2021-10-12, 19:25
Replies: 3,141
Views: 256,665
Posted By charybdis
Happy to leave it for you. While I remember...

Happy to leave it for you.

While I remember - Greg do you have the c220 postprocessing log to hand?
Forum: Aliquot Sequences 2021-10-12, 14:50
Replies: 3,141
Views: 256,665
Posted By charybdis
:bow: Congrats Ryan and Greg on an enormous...

:bow:

Congrats Ryan and Greg on an enormous job! I make that the 7th largest public GNFS ever?

Anyone working the c163 on the next line?
Forum: CADO-NFS 2021-10-10, 12:46
Replies: 2
Views: 219
Posted By charybdis
The way I understand it, "polyselect" performs...

The way I understand it, "polyselect" performs the equivalent of np1 and nps, "sopt" does the equivalent of nps alone, and "polyselect_ropt" is equivalent to npr. The CADO script runs polyselect...
Forum: Msieve 2021-10-09, 00:12
Replies: 185
Views: 52,812
Posted By charybdis
I have a 1.098e-12 that I never bothered to post...

I have a 1.098e-12 that I never bothered to post because (a) it was hardly an improvement and (b) I figured that with no updates for several years people weren't really keeping track of records below...
Forum: NFS@Home 2021-10-07, 23:18
Replies: 82
Views: 9,916
Posted By charybdis
Same here - well spotted Jon. Didn't even look at...

Same here - well spotted Jon. Didn't even look at the job name; the "35" should have set alarm bells ringing.

The cownoise poly generator appears to automatically generate quartics for exponents...
Forum: CADO-NFS 2021-10-07, 17:56
Replies: 72
Views: 13,341
Posted By charybdis
The way I tested this was to look at the CPU-time...

The way I tested this was to look at the CPU-time stats in the logfile ('stats_total_cpu_time') to find ranges that took almost exactly the same length of time to sieve, and then see which of these...
Forum: NFS@Home 2021-10-04, 14:48
Replies: 82
Views: 9,916
Posted By charybdis
Using composite special-q will also lead to a...

Using composite special-q will also lead to a high duplication rate. It's a useful way to squeeze out a few more relations when yield is low due to suboptimal parameters (eg artificially low lpb and...
Forum: NFS@Home 2021-10-04, 13:30
Replies: 82
Views: 9,916
Posted By charybdis
The normalized relations formula is not...

The normalized relations formula is not applicable when composite special-q are being used, as it is based on the premise that special-q have the same frequency as primes.
Forum: NFS@Home 2021-10-03, 12:51
Replies: 82
Views: 9,916
Posted By charybdis
Very nicely done; glad to be wrong about GNFS vs...

Very nicely done; glad to be wrong about GNFS vs SNFS in this case.



Is this normal for the 16e-small queue?
Forum: Aliquot Sequences 2021-10-02, 17:08
Replies: 3,141
Views: 256,665
Posted By charybdis
It can't - the 2^2 guarantees sigma(n) is...

It can't - the 2^2 guarantees sigma(n) is divisible by sigma(2^2) = 7, so the next term which is sigma(n)-n will also be divisible by 7. Similarly the 7 means that sigma(n) will be divisible by 8, so...
Forum: NFS@Home 2021-10-02, 00:46
Replies: 82
Views: 9,916
Posted By charybdis
Aha, good to know. Sorry if I confused anyone. ...

Aha, good to know. Sorry if I confused anyone.

Never mind the parameter choice for the quartic, I'm surprised this isn't obviously better by GNFS. While it isn't a perfect reflection of...
Forum: NFS@Home 2021-10-01, 20:48
Replies: 82
Views: 9,916
Posted By charybdis
This should be lpbr/lpba 34/32 - not 32/34 which...

This should be lpbr/lpba 34/32 - not 32/34 which would be more appropriate for an octic. (the larger the degree the larger the algebraic side)

Msieve is fine with 34-bit large primes; it's the...
Showing results 1 to 25 of 502

 
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