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Search: Posts Made By: Zhangrc
Forum: Software 2022-05-02, 10:28
Replies: 224
Sticky: Prime95 30.7
Views: 29,604
Posted By Zhangrc
Maybe all-complex FFT with AVX-512 instruction...

Maybe all-complex FFT with AVX-512 instruction set is faster.
FFT uses complex numbers, if we compute a complex number directly instead of computing the real and imaginary part respectively, we...
Forum: Information & Answers 2022-04-28, 08:47
Replies: 4
Views: 382
Posted By Zhangrc
I've never encountered it until yesterday. When...

I've never encountered it until yesterday. When Gerbitz checking failed, I was frightened. My exponent, M109529873, was 96% done. So I decided to finish it anyway, instead of starting from scratch....
Forum: PrimeNet 2022-04-26, 02:32
Replies: 137
Views: 44,192
Posted By Zhangrc
It needs patience. It might take years for him to...

It needs patience. It might take years for him to find another cloud computing service.
By the way, why don't you set your account to get smallest exponents and put your computer to work at current...
Forum: Software 2022-04-24, 12:31
Replies: 561
Views: 41,262
Posted By Zhangrc
30.8 uses a larger FFT in stage 2. ...

30.8 uses a larger FFT in stage 2.



That's George's decision. He is so talented, don't put extra pressure on him and he'll give us a surprise!
Maybe it will be 30.9b1, because George said that...
Forum: GpuOwl 2022-04-23, 04:28
Replies: 34
Views: 1,959
Posted By Zhangrc
Why is CUDALucas using a larger FFT but...

Why is CUDALucas using a larger FFT but considerably faster than GPUowl?
Forum: Software 2022-04-20, 00:19
Replies: 561
Views: 41,262
Posted By Zhangrc
It's not a bug, instead, that's what P-1 is...

It's not a bug, instead, that's what P-1 is expected to yield.
take M67 for example:

2^67-1=
193707721 (k=2^2*3^3*5*2677)
*761838257287 (k=3^2*29*2551*8539)

So, you know, P-1 will find both...
Forum: Data 2022-04-18, 03:45
Replies: 134
Views: 8,290
Posted By Zhangrc
Does this project involve TF? I saw some...

Does this project involve TF?
I saw some exponents at 38.1M with TF done to 2^71, and it would be fairly easy to TF all of them to 2^73.
May I reserve that range for TF?
Forum: Data 2022-04-16, 02:52
Replies: 1,401
Views: 174,810
Posted By Zhangrc
Last one! I bet that factor will be found in...

Last one!
I bet that factor will be found in minutes:bounce wave:
Forum: Data 2022-04-15, 14:03
Replies: 1,401
Views: 174,810
Posted By Zhangrc
This project will complete in several hours…… ...

This project will complete in several hours……
Only 5 factors left, and tomorrow morning it will be done.
Congratulations!
Forum: Data 2022-04-10, 02:42
Replies: 1,401
Views: 174,810
Posted By Zhangrc
And 108.9M too, it needs only 2 more factors! ...

And 108.9M too, it needs only 2 more factors!
But it should be done anyway before the project finishes.
Forum: PrimeNet 2022-04-09, 14:57
Replies: 2,484
Views: 297,660
Posted By Zhangrc
One year ago, PrimeNet stopped releasing first...

One year ago, PrimeNet stopped releasing first time LL tests.
I think it's now time to stop giving credit to first time LL results (DC should not be affected).
Forum: Software 2022-04-09, 02:10
Replies: 561
Views: 41,262
Posted By Zhangrc
@George: Could you allow "Minutes between disk...

@George:
Could you allow "Minutes between disk saves" be adjusted to less than 10?
I have several colab instances which terminate randomly and the time is limited. However, I see no restrictions on...
Forum: PrimeNet 2022-04-02, 03:50
Replies: 2,484
Views: 297,660
Posted By Zhangrc
You have to get them manually. Put the lines to...

You have to get them manually. Put the lines to worktodo.txt and let Prime95 automatically reserve them.
Forum: Software 2022-03-30, 23:51
Replies: 561
Views: 41,262
Posted By Zhangrc
At least you completed stage 1. Usually I...

At least you completed stage 1.
Usually I couldn't finish stage 1 due to SUMOUT ERRORS.
Anyway, I'm not trying to reproduce it this time. I'm switching P-1 to PRP.
Forum: Software 2022-03-30, 13:40
Replies: 561
Views: 41,262
Posted By Zhangrc
I thought that Xeons support FMA3. That's what...

I thought that Xeons support FMA3. That's what Colab told me:

[Work thread Mar 30 01:45] Using FMA3 FFT length 6M, Pass1=1K, Pass2=6K, clm=1
[Work thread Mar 30 01:45] Ignoring suggested B2...
Forum: Software 2022-03-30, 00:46
Replies: 561
Views: 41,262
Posted By Zhangrc
Who cares about SSE2 in the year of 2022? Ignore...

Who cares about SSE2 in the year of 2022? Ignore it!:cool:
Anyway, if one has lots of memory, it's unlikely that he combines them with an obsolete CPU that supports nothing except SSE2.
Forum: Hardware 2022-03-28, 07:26
Replies: 70
Views: 9,089
Posted By Zhangrc
What does "all-complex" mean here? Does it...

What does "all-complex" mean here?
Does it affect FFT cutoff?
Seems that throughput becomes higher with all-complex FFTs.
Forum: Data 2022-03-27, 05:16
Replies: 3,569
Views: 345,338
Posted By Zhangrc
Seems that they are getting PRP without any P-1. ...

Seems that they are getting PRP without any P-1.


v308 108356371 F-PM1 2022-03-23 02:25 8.5 Factor: 996452764760981189944109089 / (P-1, B1=471000, B2=41197002) 18.0118...
Forum: Data 2022-03-27, 05:04
Replies: 3,569
Views: 345,338
Posted By Zhangrc
They have all been tested at least once, so I'm...

They have all been tested at least once, so I'm not delaying any of the milestones. You see, most of them have been tested by WR, although without P-1 and CERT.
Forum: GpuOwl 2022-03-21, 05:19
Replies: 2,760
Views: 365,667
Posted By Zhangrc
Try chmod 777 and deleting memlock-0, if not...

Try chmod 777 and deleting memlock-0, if not working, try copying the files to your computer and run on your own GPU. If nothing works, wait for an update of GPUOwl in the hope of addressing the...
Forum: Software 2022-03-20, 02:32
Replies: 561
Views: 41,262
Posted By Zhangrc
Will stopping and restarting P-1 during stage 1...

Will stopping and restarting P-1 during stage 1 with larger bounds (due to more memory available) generate valid results?
Forum: Software 2022-03-19, 01:06
Replies: 561
Views: 41,262
Posted By Zhangrc
A small bug which doesn't produce invalid results...

A small bug which doesn't produce invalid results nor results in crashing should be ignored.
It only affect very large D values which will not appear in testing bigger exponents. Exponents bigger...
Forum: Lone Mersenne Hunters 2022-03-17, 13:28
Replies: 2,132
Views: 311,857
Posted By Zhangrc
M108320761 has a factor:...

M108320761 has a factor: 60009555748293413447823073
(85.633 bits, k= 2^4 × 3^2 × 2531 × 412637 × 1841857, found by V30.8b11 with B1=463000, B2=40465194)
Which cleared 108.3M out.
Forum: Cloud Computing 2022-03-15, 04:09
Replies: 1,186
Views: 153,122
Posted By Zhangrc
gpuowl build failure

I tried to build gpuowl on my colab instance I just created today. I used the script of https://www.mersenneforum.org/showpost.php?p=527930&postcount=7 .

However, there's an error:

...
Forum: PrimeNet 2022-03-11, 07:35
Replies: 10
Views: 815
Posted By Zhangrc
You haven't changed the number on...

You haven't changed the number on https://www.mersenne.org/workload/ .

The number 1.3 is a rough estimate, because most of the exponents are verified by a PRP and a CERT, which need 1.01 tests,...
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