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Search: Posts Made By: drkirkby
Forum: Lounge 2021-05-18, 16:30
Replies: 223
Views: 36,622
Posted By drkirkby
It seems I made quite a few errors in my post....

It seems I made quite a few errors in my post. :yucky:Anyway, the fact remains that the residual, whether PRP or LL, is not going to tell you anything about how close you are to a finding a Mersenne...
Forum: Lounge 2021-05-18, 16:23
Replies: 223
Views: 36,622
Posted By drkirkby
Yeah, I take your point - it touches on what I...

Yeah, I take your point - it touches on what I asked on another forum, although I did start my post here saying exponent. But I agree 24036583 is not a Mersenne prime, but rather 2^24036583 -1 is.
Forum: Lounge 2021-05-18, 16:13
Replies: 223
Views: 36,622
Posted By drkirkby
I just noticed the twin-prime I posted had a LL...

I just noticed the twin-prime I posted had a LL without any zeros near the end. If you want to compute its PRP you could do so. Whether you take a LL residual or PRP residual, the residual is not...
Forum: Lounge 2021-05-18, 15:49
Replies: 223
Views: 36,622
Posted By drkirkby
Em, I would ask what's the residual got to do...

Em,
I would ask what's the residual got to do with the price of cheese (my Dad used cheese, not fish). :smile:

Take a look at the exponent 24036581...
Forum: Lounge 2021-05-18, 11:12
Replies: 223
Views: 36,622
Posted By drkirkby
What evidence supports your belief that the next...

What evidence supports your belief that the next Mersenne Prime will be in the M168,xxx,xxx region?
Forum: Information & Answers 2021-05-18, 07:37
Replies: 15
Views: 273
Posted By drkirkby
I appreciate for large numbers > 100, the number...

I appreciate for large numbers > 100, the number will be the exponent. But for an example I gave of 17, it is far from obvious. However, I was looking for a formula to write a sequence to OIES. In...
Forum: Information & Answers 2021-05-18, 00:42
Replies: 15
Views: 273
Posted By drkirkby
Yes, I do have a PhD, although the "dr" at the...

Yes, I do have a PhD, although the "dr" at the front of my username is actually my initials. My PhD is in medical physics and bioengineering.

I don't think the question is so stupid, as the...
Forum: Information & Answers 2021-05-17, 23:30
Replies: 15
Views: 273
Posted By drkirkby
Is there an accepted standard for refering to Mersenne Prime numbers?

I'm a bit confused by what seems to be an inconsistent way of numbering Mersenne prime numbers. For example, is the 19th Mersenne prime (2^89 -1 = 618970019642690137449562111)

M10 - since it is...
Forum: PrimeNet 2021-05-17, 23:03
Replies: 2
Views: 102
Posted By drkirkby
I restored all the files exactly - a backup was...

I restored all the files exactly - a backup was made of the complete directory, so every file was restored exactly as it was. Even modification times. mprime showed my preferences were PRP tests...
Forum: News 2021-05-17, 22:04
Replies: 10
Views: 1,897
Posted By drkirkby
I'm in the UK, and donate via smile.amazon.co.uk...

I'm in the UK, and donate via smile.amazon.co.uk to an animal charity. I'll be honest, I would rather the money went to the animal charity, so I did not intend changing the charity to GIMPS, but I...
Forum: PrimeNet 2021-05-17, 20:06
Replies: 2
Views: 102
Posted By drkirkby
Problems after opting to do a bit of trial factoring.

I normally run PRP tests on my dual Xeon machine, but last week I was backing up the machine to change the operating system (CentOS -> Ubuntu), so decided to



1) Stop the PRP test in progress ...
Forum: Cloud Computing 2021-05-15, 21:14
Replies: 5
Views: 346
Posted By drkirkby
The prime test on the free Amazon account is...

The prime test on the free Amazon account is really rocketing along, at and incredible speed :spot:
https://www.mersenne.org/report_exponent/?exp_lo=110832257&full=1

Allocated on 4th April 2021. ...
Forum: GPU Computing 2021-05-14, 12:42
Replies: 6
Views: 217
Posted By drkirkby
Given I have a PRP test reserved on 103777013,...

Given I have a PRP test reserved on 103777013, but no trial-factor assignment ID, can the results be usefully uploaded?
no factor for M103777013 from 2^76 to 2^77 [mfaktc 0.21 barrett87_mul32_gs]...
Forum: GPU Computing 2021-05-14, 10:28
Replies: 6
Views: 217
Posted By drkirkby
Thumbs up The iterative approach to compute levels was...

The iterative approach to compute levels was pretty quick, despite that was the first Cuda application I had ever built. I don't think reading the documentation would have been quicker. :smile:
...
Forum: GPU Computing 2021-05-13, 20:53
Replies: 6
Views: 217
Posted By drkirkby
Oops, I just realised that gpuowl was running on...

Oops, I just realised that gpuowl was running on the graphics card at the same time as mfaktc! Now the speed of mfaktc seems much more impressive than the Intel Xeon Platinum 8167M. In fact, I have a...
Forum: GPU Computing 2021-05-13, 20:22
Replies: 6
Views: 217
Posted By drkirkby
Tips for building mfaktc 0.21 on Ubuntu 20.04

I'm not sure where best to post this - it is mainly a software issue, but there's no GPU specific forum for software, but there is for hardware. However, there is a bit of hardware specific stuff, so...
Forum: GpuOwl 2021-05-13, 14:36
Replies: 4
Views: 149
Posted By drkirkby
Thank you. I will bookmark the reference thread. ...

Thank you. I will bookmark the reference thread.

:smile:At

https://www.mersenneforum.org/showthread.php?t=23473
there's a list of things affecting the number of GPUs in a system. The last is...
Forum: GpuOwl 2021-05-13, 13:14
Replies: 4
Views: 149
Posted By drkirkby
what's the format of config.txt for gpuowl?

I run GpuOwl - I have no idea of the version, as as the program does not report this. When it runs, it says

2021-05-12 11:00:26 GpuOwl VERSIONI tried looking in the source code. The nearest I...
Forum: Msieve 2021-05-12, 19:03
Replies: 41
Views: 19,049
Posted By drkirkby
That's a bit of a problem with open-source...

That's a bit of a problem with open-source benchmarks. The performance depends on the compiler and the computer. On really needs to compare hardware using the same binary. It would be worth the...
Forum: GPU Computing 2021-05-12, 11:47
Replies: 20
Views: 492
Posted By drkirkby
Yes, with hyperthreading disabled in the BIOS,...

Yes, with hyperthreading disabled in the BIOS, the CPU usage is closer to maximum. It's 19.2% idle, which is a lot lower than it was with hyperextending enabled. Anyway, I still think there is an...
Forum: GPU Computing 2021-05-12, 11:31
Replies: 20
Views: 492
Posted By drkirkby
PS, I will try disabling hyperthreading in the...

PS, I will try disabling hyperthreading in the BIOS, and see if the apparent CPU untilisation rises. I'm running linux, so don't use task manager. Later I will test with a smaller PRP exponent that...
Forum: GPU Computing 2021-05-12, 11:15
Replies: 20
Views: 492
Posted By drkirkby
The machine come with Windoze. When I run this...

The machine come with Windoze. When I run this benchmark, which I think is fairly common
https://www.passmark.com/
it gives a report on various aspects of the computer - CPUs, graphics, memory etc....
Forum: GpuOwl 2021-05-12, 10:30
Replies: 2,714
Views: 260,787
Posted By drkirkby
Here's a benchmark result that may be helpful for...

Here's a benchmark result that may be helpful for an Nvida P2200 graphics card in a Dell 7920 fitted with a pair of Xeon 8167Ms and 384 GB RAM. The GPU is considerably slower than the CPUs - see a...
Forum: GPU Computing 2021-05-12, 10:04
Replies: 20
Views: 492
Posted By drkirkby
That exponent is smaller than the one I did...

That exponent is smaller than the one I did before, so therefore will take less time.
2021-05-12 11:00:40 Quadro P2200-0 77936867 OK 800 0.00% 1579c241dc63eca6 7271 us/it + check 3.12s +...
Forum: GPU Computing 2021-05-12, 09:12
Replies: 20
Views: 492
Posted By drkirkby
A used Vega64 is more expensive than a used Intel...

A used Vega64 is more expensive than a used Intel Xeon Platinum 8167M, but the Xeon is faster at around 1.5 ms/iteration. An AMD RX 6700 XT is well over twice the price of the Xeon.

I am fairly...
Showing results 1 to 25 of 221

 
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