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Search: Posts Made By: Zhangrc
Forum: Marin's Mersenne-aries 2021-09-25, 08:51
Replies: 14
Views: 379
Posted By Zhangrc
How long exactly? For me, TF from 2^76 to 2^77...

How long exactly?
For me, TF from 2^76 to 2^77 takes 3 hours while PRP and P-1 takes 11 to 12 days. It still make sense to TF to 2^77.
Forum: Marin's Mersenne-aries 2021-09-25, 08:42
Replies: 14
Views: 379
Posted By Zhangrc
Me too, that doesn't hurt your throughput. Would...

Me too, that doesn't hurt your throughput. Would you like to help with some wavefront TF?
Forum: Marin's Mersenne-aries 2021-09-25, 08:36
Replies: 14
Views: 379
Posted By Zhangrc
Me too. However we should compare the time of...

Me too. However we should compare the time of running TF and P-1 on the same GPU, not TF on GPU and P-1 on CPU.
Forum: Marin's Mersenne-aries 2021-09-25, 08:15
Replies: 14
Views: 379
Posted By Zhangrc
That's my point: They have all been done months...

That's my point: They have all been done months before, and if we still focus on these "recommended" bounds, we might have nothing to do (TF at the PRP wavefront) in the future.
Forum: Marin's Mersenne-aries 2021-09-25, 08:08
Replies: 14
Views: 379
Posted By Zhangrc
Yes if you want to find more factors, no if you...

Yes if you want to find more factors, no if you want to save more time.


You are referring to your 168,***,*23, I suppose?
Forum: Marin's Mersenne-aries 2021-09-25, 07:48
Replies: 14
Views: 379
Posted By Zhangrc
The bounds are a little high, though. Not...

The bounds are a little high, though.

Not that high. It's about 0.04/(2/78) = 1.56 times higher. However, with TF done to 2^78, one need smaller P-1 bounds to reach desired probability, thus...
Forum: Marin's Mersenne-aries 2021-09-25, 04:17
Replies: 14
Views: 379
Posted By Zhangrc
Trial factoring to > 2^77?

Nowadays people mainly do trial factoring in the two-k project (which I have very little interest), and GPU72 is releasing TF assignments to 2^76 and seems very reluctant to give any higher bounds....
Forum: mersenne.ca 2021-09-21, 03:00
Replies: 691
Sticky: mersenne.ca
Views: 90,808
Posted By Zhangrc
I'll do them all by TFing them to 74 bits. I'll...

I'll do them all by TFing them to 74 bits. I'll finish them by tonight.
Are there other exponents with higher TF done but intermediate levels missing in the 100-120M range?
Forum: Software 2021-09-21, 02:53
Replies: 446
Views: 46,790
Posted By Zhangrc
Try turning off the swapfile.sys and allocating...

Try turning off the swapfile.sys and allocating 8GB for your Prime95 (If there are no other applications running on your computer) and see if this happens again.
Forum: GPU to 72 2021-09-19, 12:31
Replies: 5,215
Views: 368,002
Posted By Zhangrc
The "assignments" page on GPU72 isn't functioning...

The "assignments" page on GPU72 isn't functioning properly.
The settings on the graph attached below yields 122M exponents, like Factor=N/A,122012131,75,77, which is inconsistent with the preview.
Forum: PrimeNet 2021-09-12, 03:12
Replies: 35
Views: 1,768
Posted By Zhangrc
See https://www.mersenne.ca/cudalucas.php for...

See https://www.mersenne.ca/cudalucas.php for details. The prices are a bit obsolete, but you could find that the older models (RX 5xxx(XT), Radeon VII) are much cheaper.
Forum: PrimeNet 2021-09-10, 16:17
Replies: 35
Views: 1,768
Posted By Zhangrc
You can if you want. RX 6900 XT or Radeon 7 or...

You can if you want. RX 6900 XT or Radeon 7 or other recent AMD Radeon cards can complete a PRP in less than two days, while a 3090 needs 4 to 5 days.
You need to run a software on it, called GPUowl.
Forum: PrimeNet 2021-09-04, 12:27
Replies: 35
Views: 1,768
Posted By Zhangrc
Something, like increasing the amount of money...

Something, like increasing the amount of money for discovering Mersenne primes, or setting up an award for finding large factors, would help.
Forum: PrimeNet 2021-09-04, 11:47
Replies: 35
Views: 1,768
Posted By Zhangrc
See...

See https://www.mersenneforum.org/showthread.php?t=26491 for details.
The key point is how can we ensure "crypto".
Factors and Res64 are already open to the public.
Also, if those coins were...
Forum: Hardware 2021-09-03, 12:53
Replies: 15
Views: 1,023
Posted By Zhangrc
Off topic, but the right bracket outside the URL...

Off topic, but the right bracket outside the URL tag causes confusion.

You always tell people to check spelling and grammar for every post.

But we must accept that even the best of us make...
Forum: mersenne.ca 2021-09-03, 06:44
Replies: 691
Sticky: mersenne.ca
Views: 90,808
Posted By Zhangrc
Decreasing bit levels??

Is that possible?
It seems really strange, because I couldn't find a single one in https://www.mersenne.org/report_factoring_effort/.
Is it a bug?
@James Heinrich
Forum: Software 2021-08-29, 16:08
Replies: 446
Views: 46,790
Posted By Zhangrc
On my laptop AMD R7 4800H @4GHz, 8G*2 DDR4, and...

On my laptop AMD R7 4800H @4GHz, 8G*2 DDR4, and 512G NVME SSD.
Forum: Software 2021-08-29, 11:50
Replies: 446
Views: 46,790
Posted By Zhangrc
They are about 5% slower than the current...

They are about 5% slower than the current version. I see no point using them.
Forum: Lone Mersenne Hunters 2021-08-27, 15:16
Replies: 1,943
Views: 258,413
Posted By Zhangrc
M111298699 has a factor: 82602996758522984927977...

M111298699 has a factor: 82602996758522984927977 (76.129 bits)

2 factors were found out of 22 trials in the 111.2M range. That's lucky enough, for there were some time when I tested more than 500...
Forum: Marin's Mersenne-aries 2021-08-26, 14:54
Replies: 68
Views: 4,868
Posted By Zhangrc
All exponent below 57M have been verified. I...

All exponent below 57M have been verified.
I predict that we'll finish the verification of M57885161 in about a month, probably before 2021-10-01.
Forum: Lone Mersenne Hunters 2021-08-26, 11:48
Replies: 1,943
Views: 258,413
Posted By Zhangrc
M111298777 has a factor: 135398831970267435540791...

M111298777 has a factor: 135398831970267435540791 (76.842 bits)
k = 5 × 23 × 37 × 313 × 1069 × 427241
Another P-1 smooth factor found by TF.
Forum: Software 2021-08-25, 00:41
Replies: 446
Views: 46,790
Posted By Zhangrc
Shutting down during proof generation results in redoing iterations

An old problem, see: https://www.mersenneforum.org/showthread.php?t=26933
AFAIK, writing a checkpoint file during proof generation is not so difficult, since only 500MB of RAM were used.
If that's...
Forum: PrimeNet 2021-08-24, 01:18
Replies: 2,344
Views: 246,935
Posted By Zhangrc
I've seen this pattern multiple times, especially...

I've seen this pattern multiple times, especially in the end of 2020 when Delo reduced his computing power before achieving 100M milestone.
See:
https://www.mersenne.org/thresholds/?dt=2020-10-04...
Forum: Lounge 2021-08-23, 02:06
Replies: 888
Views: 82,631
Posted By Zhangrc
... if LL and PRP tests become as easy as this: ...

... if LL and PRP tests become as easy as this:

def LL(p):
x = 4
for i in range(1, p-1): x = pow(x, 2, 2**p - 1) - 2
return x

PRP = lambda p: pow(3, 2**p - 2, 2**p - 1)
Forum: News 2021-08-22, 09:38
Replies: 18
Views: 1,149
Posted By Zhangrc
Use ProofPower=5 and NumBackupFiles=2 in...

Use ProofPower=5 and NumBackupFiles=2 in prime.txt. Backup files take up space as well.


That's OK.

A formula to estimate the interim file size for M_p (in bytes): (p * 2^ProofPower) / 8
Showing results 1 to 25 of 85

 
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