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Forum: Software 2021-09-21, 16:30
Replies: 8
Views: 885
Posted By Mysticial
Worth noting that there's quite a bit of beef...

Worth noting that there's quite a bit of beef between GMP and MPIR.

The GMP devs hate Windows and anything Microsoft. It's quite obvious from the tone of language in their mailing lists.

This...
Forum: y-cruncher 2021-08-19, 16:15
Replies: 68
Views: 52,374
Posted By Mysticial
Verification is done and it matches. So the screw...

Verification is done and it matches. So the screw up fortunately didn't turn out to be.
Forum: y-cruncher 2021-08-18, 23:10
Replies: 68
Views: 52,374
Posted By Mysticial
I'm not surprised Ian noticed. He's been eyeing...

I'm not surprised Ian noticed. He's been eyeing this record for a while now and knows all the in-and-outs of it. He just needs to source the storage for it before he can make a run for the record.
...
Forum: y-cruncher 2021-08-18, 16:43
Replies: 68
Views: 52,374
Posted By Mysticial
So this is uh... not great. Based on my...

So this is uh... not great.

Based on my email convo with Thomas (the guy in charge of the latest Pi computation), it looks like they did not verify the computation. Because when I asked about the...
Forum: Abstract Algebra & Algebraic Number Theory 2021-08-17, 22:22
Replies: 10
Views: 8,168
Posted By Mysticial
Coming from the other thread on Pi... Wow at this...

Coming from the other thread on Pi... Wow at this formula!

There is a way to (fairly) accurately estimate how fast a formula like this is for actual computer implementations.

Say you have a...
Forum: y-cruncher 2021-08-17, 22:04
Replies: 68
Views: 52,374
Posted By Mysticial
Had to check back at my emails because it's been...

Had to check back at my emails because it's been so long since I last spoke with Thomas that I completely forgot he was still running this. :davieddy:

Yes, it was on y-cruncher, and he asked me...
Forum: y-cruncher 2021-08-17, 21:44
Replies: 68
Views: 52,374
Posted By Mysticial
I believe it's Chudnovsky. I'll have to look...

I believe it's Chudnovsky.

I'll have to look take a closer look at your ArcTan formula when I get the time. But my first impression is that yes multiple terms can be run in parallel, but it's not...
Forum: y-cruncher 2021-08-17, 16:32
Replies: 68
Views: 52,374
Posted By Mysticial
Been so busy lately that I hadn't had time to...

Been so busy lately that I hadn't had time to process this record yet on my site. haha

I need to give y-cruncher a bit of love back. Largely neglected it for almost 2 years now. And lots of...
Forum: Hardware 2021-08-06, 17:30
Replies: 12
Views: 1,094
Posted By Mysticial
My guess is yes. But whether it makes that much...

My guess is yes. But whether it makes that much of a difference is uh... above my pay grade.

A few years back I was in a company meeting with Intel where they mentioned caches and memory subsystem...
Forum: Hardware 2021-08-06, 16:40
Replies: 12
Views: 1,094
Posted By Mysticial
My guess is that since these are turbo speeds,...

My guess is that since these are turbo speeds, they will throttle down when actually pushed against the TDP limit.

IOW, even though the i9-10920X has higher turbo speeds, it would probably run...
Forum: Software 2021-07-18, 21:07
Replies: 50
Views: 3,523
Posted By Mysticial
Worth mentioning that using balanced...

Worth mentioning that using balanced representation cancellation puts you squarely into the "works for average case, but not all cases" category. It is no longer 100% reliable because it's always...
Forum: Software 2021-07-17, 23:10
Replies: 50
Views: 3,523
Posted By Mysticial
I'll mention that ProtoNTT is just a prototype....

I'll mention that ProtoNTT is just a prototype. y-cruncher's actual NTT is completely different implementation-wise. (and faster)

Computationally, FFTs are much faster than NTT, but NTT wins the...
Forum: Lounge 2021-03-08, 04:51
Replies: 46
Views: 4,702
Posted By Mysticial
~12000 ft while driving across the Rockies....

~12000 ft while driving across the Rockies. Definitely felt lightheaded so tried to get down the other side as soon as possible.


~12000 ft while flying in my colleague's plane (unpressurized). I...
Forum: y-cruncher 2021-01-06, 17:48
Replies: 14
Views: 3,905
Posted By Mysticial
Over the years, there have many people who have...

Over the years, there have many people who have approached me thinking they were entitled to the source code. I'm not gonna the hide the fact that I've grown quite contempt of such people after...
Forum: y-cruncher 2021-01-06, 17:47
Replies: 68
Views: 52,374
Posted By Mysticial
Another approach: Ask for any random offset and...

Another approach: Ask for any random offset and if you don't get an answer immediately, then it's suspicious. It would take a tremendous amount of computing power to run get a distant offset in under...
Forum: Hardware 2020-05-25, 00:01
Replies: 60
Views: 25,555
Posted By Mysticial
The 8121U Cannon Lake. Discontinued though I...

The 8121U Cannon Lake. Discontinued though I think.
Forum: y-cruncher 2020-02-07, 10:14
Replies: 68
Views: 52,374
Posted By Mysticial
To answer your actual question of how I do the...

To answer your actual question of how I do the conversion "in place". The algorithm is the scaled remainder tree. The only operations are multiplications. There are no additions or subtractions at...
Forum: y-cruncher 2020-02-07, 09:47
Replies: 68
Views: 52,374
Posted By Mysticial
Woah, I go away for a while and didn't notice all...

Woah, I go away for a while and didn't notice all these new posts!




It's not fully in-place in that it doesn't need any auxiliary memory. It needs a lot actually - especially to perform the...
Forum: y-cruncher 2020-01-30, 18:56
Replies: 68
Views: 52,374
Posted By Mysticial
62.8 trillion digits of Pi - GWR

So when Google set the record of 31.4 trillion digits last year, I gave it a 50/50 chance that record would fall before the end of the year.

Didn't quite work out that way. This latest computation...
Forum: Math 2019-12-05, 00:16
Replies: 1
Views: 2,718
Posted By Mysticial
Ideas: I'm not familiar with the structure...

Ideas:

I'm not familiar with the structure of an optimized mersenne-transform (due to its asymmetry). But if the FFT is out-of-place and you're expending bandwidth to save the integer...
Forum: ONeil 2019-12-04, 23:55
Replies: 18
Views: 3,918
Posted By Mysticial
Easy to check for yourself. Mathematica/Wolfram...

Easy to check for yourself. Mathematica/Wolfram Alpha says they're all composite.
Forum: Hardware 2019-11-05, 21:47
Replies: 14
Views: 4,221
Posted By Mysticial
Turn on XMP. Hardly any non-server memory is...

Turn on XMP. Hardly any non-server memory is above "stock" 2133. Anything above it usually implies XMP.

Btw, my 7940X (ES) will do 3466 with a full load of 8 x 16GB.
Forum: y-cruncher 2019-10-30, 18:33
Replies: 0
Views: 5,156
Posted By Mysticial
Parallel Disk I/O

The topic of parallel disk I/O has been a recurring topic and has just come up again. So I figured I create a thread to keep everything together.

First of all, there's multiple forms of parallel...
Forum: y-cruncher 2019-10-29, 16:33
Replies: 15
Views: 9,006
Posted By Mysticial
Not sure if I understand what you're referring...

Not sure if I understand what you're referring to.

Right now, swap mode uses one thread per logical path. So you can get multiple threads by using multiple logical paths - thus it's advantageous...
Forum: Hardware 2019-10-24, 19:15
Replies: 14
Views: 4,221
Posted By Mysticial
Not even close. You'd probably need 8 - 16...

Not even close. You'd probably need 8 - 16 channels to keep LL from bottlenecking on 18-core Skylake X.

The high core count Skylake X's aren't a good value for LL for this reason. You're probably...
Showing results 1 to 25 of 344

 
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