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Search: Posts Made By: charybdis
Forum: Cunningham Tables 2021-11-27, 02:01
Replies: 3
Views: 123
Posted By charybdis
Depends if you set ropteffort very high. With...

Depends if you set ropteffort very high. With ropteffort=100 you'll be fine. 200 might potentially need more time on old/slow CPUs.
Your adrange is small enough that the length of the...
Forum: Homework Help 2021-11-26, 18:12
Replies: 19
Views: 3,732
Posted By charybdis
It depends what you mean by "reduced". Try...

It depends what you mean by "reduced". Try subtracting p from all the factors of the numerator, so p-1 turns into -1, p-2 into -2 etc, and see what that gives you.
Forum: Cunningham Tables 2021-11-26, 00:56
Replies: 3
Views: 123
Posted By charybdis
Polynomial selection for 2,2246M c221

This is one of only two remaining unambiguous GNFS numbers from the 1987 edition of the Cunningham book (base 2 <1200 bits), the other being 2,1109+ c225.

Bob Silverman suggested that the forum...
Forum: Cunningham Tables 2021-11-25, 20:08
Replies: 315
Views: 43,920
Posted By charybdis
Thank you for organising! Hope the linear algebra...

Thank you for organising! Hope the linear algebra goes smoothly.
Forum: Number Theory Discussion Group 2021-11-22, 21:15
Replies: 7
Views: 363
Posted By charybdis
This may be a valid PRP test (i.e. "p is prime"...

This may be a valid PRP test (i.e. "p is prime" => "condition holds") for q > 3. But you haven't proved anything in the other direction, namely "condition holds" => "p is prime". Things break down...
Forum: Cunningham Tables 2021-11-20, 18:57
Replies: 315
Views: 43,920
Posted By charybdis
Specifically it's the merge phase that's...

Specifically it's the merge phase that's multi-threaded. The rest of filtering is still single-threaded.



I remember reading somewhere that subsequent changes to CADO mean that this doesn't...
Forum: Cunningham Tables 2021-11-20, 16:46
Replies: 315
Views: 43,920
Posted By charybdis
The A/I value determines the size of the sieve...

The A/I value determines the size of the sieve region, i.e. how hard we search for relations at each special-Q. Higher A values will always have higher yield but worse rels/sec, but if you use too...
Forum: Cunningham Tables 2021-11-18, 23:39
Replies: 315
Views: 43,920
Posted By charybdis
Ah whoops, got these mixed up. Thanks for the...

Ah whoops, got these mixed up. Thanks for the correction!
Forum: Cunningham Tables 2021-11-18, 19:30
Replies: 315
Views: 43,920
Posted By charybdis
--bind-to none should only be needed with -np 2....

--bind-to none should only be needed with -np 2. --bind-to socket ought to have the same effect. When there are at least 3 processes OpenMPI will bind to socket by default. I have no clue why it...
Forum: Cunningham Tables 2021-11-18, 16:43
Replies: 315
Views: 43,920
Posted By charybdis
Very good! This confirms that A=30 was the right...

Very good! This confirms that A=30 was the right choice.



They were PMs, not posts :smile:



The answer to these is generally "maybe - give it a try". As long as the matrix remains above...
Forum: Cunningham Tables 2021-11-18, 12:53
Replies: 315
Views: 43,920
Posted By charybdis
You'll probably want to wait at least until a...

You'll probably want to wait at least until a matrix can be built with target_density=120; I expect VBCurtis will chime in later with his thoughts. Chances are if you tried TD=120 now you would get...
Forum: Cunningham Tables 2021-11-18, 11:54
Replies: 315
Views: 43,920
Posted By charybdis
My clients - and seemingly everyone else's - were...

My clients - and seemingly everyone else's - were unable to connect to the server for 3 hours last night, until about 07:10 your time. The logs show the same "Connection timed out" error as they do...
Forum: Cunningham Tables 2021-11-17, 20:59
Replies: 315
Views: 43,920
Posted By charybdis
Do rankings usually start at 0th place in...

Do rankings usually start at 0th place in Germany? :ermm:

(nice work again btw)
Forum: Cunningham Tables 2021-11-17, 13:29
Replies: 315
Views: 43,920
Posted By charybdis
Only in Greg's version of msieve, not the...

Only in Greg's version of msieve, not the "official" one.
Forum: NFS@Home 2021-11-17, 12:48
Replies: 1,872
Views: 162,811
Posted By charybdis
If you want something to try this out on, the...

If you want something to try this out on, the octic for 2,1180+ (diff. 285) sieves ~3 times faster than the quartic. Hard to do an exact comparison because yield drops off so much faster for the...
Forum: Cunningham Tables 2021-11-17, 12:35
Replies: 315
Views: 43,920
Posted By charybdis
Well I can't say I've ever tried to cat >200k...

Well I can't say I've ever tried to cat >200k files at once before :smile: Glad you found a good solution.

Of course I should have said "A5 to A0" rather than "A6 to A0" in my previous post. Not...
Forum: Cunningham Tables 2021-11-17, 11:25
Replies: 315
Views: 43,920
Posted By charybdis
I just run cat *.gz >> [msieve directory...

I just run cat *.gz >> [msieve directory path]/msieve.dat.gz in the upload directory and then msieve -nc -v -t [threads] in the msieve directory. If you want to avoid creating a completely new...
Forum: Cunningham Tables 2021-11-16, 18:59
Replies: 315
Views: 43,920
Posted By charybdis
Nice work! The jump is from the initial change...

Nice work! The jump is from the initial change from strategy 2 to strategy 0. The later change back to strategy 2 had a much smaller effect and is basically impossible to spot.
Forum: Cunningham Tables 2021-11-15, 23:38
Replies: 315
Views: 43,920
Posted By charybdis
What's going on here? Was this something like...

What's going on here? Was this something like A=32? I hope it wasn't higher lpbs because then the extra relations would be useless.
Forum: CADO-NFS 2021-11-11, 22:02
Replies: 18
Views: 762
Posted By charybdis
I find that Haswell and Skylake have very similar...

I find that Haswell and Skylake have very similar speed/GHz for CADO. Skylake runs about 10% faster than Haswell for ECM.

Some of the newer Intel architectures are substantially faster per GHz for...
Forum: Cunningham Tables 2021-11-09, 23:53
Replies: 315
Views: 43,920
Posted By charybdis
Strange. I get 136s with -bkthresh1 3e7 and 108s...

Strange. I get 136s with -bkthresh1 3e7 and 108s without. Adding in your -bkmult 1,1l:1.08598,1s:1.30264,2s:1.08933 changes this to 123s with -bkthresh1 and 112s without. I doubt my system is 3 times...
Forum: Cunningham Tables 2021-11-09, 18:47
Replies: 315
Views: 43,920
Posted By charybdis
I tried 1e8, 5e7, 1e7 and 2e6. All were at least...

I tried 1e8, 5e7, 1e7 and 2e6. All were at least 20% slower than without -bkthresh1.
Forum: Cunningham Tables 2021-11-09, 12:04
Replies: 315
Views: 43,920
Posted By charybdis
Well well... I tried -bkthresh1 and discovered...

Well well... I tried -bkthresh1 and discovered that the latest CADO has a bug! It was probably introduced during the recent improvements to las. I'll report it to the CADO team later.

Using an...
Forum: Cunningham Tables 2021-11-09, 01:10
Replies: 315
Views: 43,920
Posted By charybdis
Yes it would, unless the siever automatically...

Yes it would, unless the siever automatically invokes it if it sees it doesn't have enough RAM. But I've never seen it do that so I presume it doesn't.

The same command uses the usual 5.2GB of...
Forum: Cunningham Tables 2021-11-09, 01:01
Replies: 315
Views: 43,920
Posted By charybdis
Aha, I think I've got it. I noticed that the...

Aha, I think I've got it. I noticed that the averages seemed to be stuck. And indeed:



Looks an awful lot like it's averaging the first 1000 WUs rather than the last 1000...
Showing results 1 to 25 of 539

 
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