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Search: Posts Made By: diep
Forum: Software 2020-12-19, 01:44
Replies: 46
Views: 8,604
Posted By diep
The rounding error seems to sometimes happen when...

The rounding error seems to sometimes happen when the FFT length is not far from taking the next increase. As i'm not so long inside the next increase i feel pretty safe there.

So for example the...
Forum: Software 2020-12-19, 00:02
Replies: 46
Views: 8,604
Posted By diep
Had restarted all 4 times at the same time now we...

Had restarted all 4 times at the same time now we see big improvement in timings the last few LLR's again at 2 processes (each proces gets 2 cores, the box has 8 in total), as we would expect because...
Forum: Software 2020-12-18, 23:59
Replies: 46
Views: 8,604
Posted By diep
As you see i compare timings from above the...

As you see i compare timings from above the boundary - so i compare the same FFT lengths with each other.

Restarting it's faster as VBCurtis explained why that's the case.
Forum: Software 2020-12-18, 15:47
Replies: 46
Views: 8,604
Posted By diep
I am running it in textmode nohupped of course -...

I am running it in textmode nohupped of course - not graphical.

Had restarted all the 4 processes. This specific proces now has 2 new outputs, see the last 2 outputs below. A lot faster again... ...
Forum: Software 2020-12-18, 02:48
Replies: 46
Views: 8,604
Posted By diep
Ok testing here at the Xeons i notice with LLR...

Ok testing here at the Xeons i notice with LLR that if an exponent has a problem that it probably is doing something else then slowing it down. Now that's ok if 1 exponent has a problem that for this...
Forum: Lounge 2020-12-10, 00:40
Replies: 1,039
Views: 62,194
Posted By diep
From what i wrote to someone on my chat regarding...

From what i wrote to someone on my chat regarding starship sn8.

I design CNC machines
i act as if i know something about hardware design
i do not understand why starship sn8 has inside 1 tube 3...
Forum: Riesel Prime Search 2020-12-04, 19:17
Replies: 68
Views: 18,324
Posted By diep
Congrats on that one! Way further away than...

Congrats on that one!

Way further away than i had guessed!!

It had so many primes below 3.14M.

If we do math from there then it's 6.8M which is factor 2 and 11+M is really far away again....
Forum: Riesel Prime Search 2020-11-30, 20:45
Replies: 399
Views: 54,335
Posted By diep
How to use the script? What do i type on the...

How to use the script?
What do i type on the command line?

something like this?

python happy.py 32767 5800000
Forum: Lounge 2020-11-30, 19:42
Replies: 1,039
Views: 62,194
Posted By diep
Wikipedia not too optimistic about VASIMR. How...

Wikipedia not too optimistic about VASIMR. How comes?

https://en.wikipedia.org/wiki/Variable_Specific_Impulse_Magnetoplasma_Rocket
Forum: Lounge 2020-11-30, 18:15
Replies: 1,039
Views: 62,194
Posted By diep
Money well spent. It's possible some years ago...

Money well spent. It's possible some years ago they suddenly saw so called 'debris' or junk in space actively move - hidden military satellites - designed to sabotage other satellites. With this you...
Forum: Riesel Prime Search 2020-11-27, 10:02
Replies: 399
Views: 54,335
Posted By diep
Kar, c'est bon! You can be sure i will...

Kar, c'est bon!

You can be sure i will report it if there is a new one above n=1569 :)

Please note for the few who might not know: testspeed of LLR with larger k's is a lot slower than small...
Forum: Riesel Prime Search 2020-11-27, 02:25
Replies: 399
Views: 54,335
Posted By diep
Happy - you sure you can't do better with a stick...

Happy - you sure you can't do better with a stick in the sand than that?
Forum: Riesel Prime Search 2020-11-27, 01:33
Replies: 399
Views: 54,335
Posted By diep
Given: k * 2^n - 1 The risk you run with...

Given: k * 2^n - 1

The risk you run with low-weights is that you do not find a prime at all,
because when the number of bits of the exponent n increases, the testing time goes exponentially up...
Forum: Software 2020-11-24, 01:19
Replies: 46
Views: 8,604
Posted By diep
Ah yes -c much better than the mask as easier to...

Ah yes -c much better than the mask as easier to read.
Forum: Software 2020-11-24, 01:14
Replies: 46
Views: 8,604
Posted By diep
Now that is interesting! That solves the...

Now that is interesting!

That solves the problem right away!!

<PRE>
nohup taskset -c 0x00000003f /home/diep/89/sllr64 &
</PRE>
And then hope it works :)
Forum: Software 2020-11-23, 15:29
Replies: 46
Views: 8,604
Posted By diep
Good Morning! On a NUMA system i notice a...

Good Morning!

On a NUMA system i notice a huge performance issue with LLR.

let's first explain the simple problem.

Probably we all know what numa systems are. memory at other sockets (or...
Forum: Riesel Prime Search 2020-11-21, 19:40
Replies: 93
Views: 26,849
Posted By diep
Note some of the shortened sieve files seem to...

Note some of the shortened sieve files seem to not work for download.
Forum: Probability & Probabilistic Number Theory 2020-11-21, 17:14
Replies: 0
Views: 1,303
Posted By diep
Sieving success as a heuristic for odds of a prime

I'm busy sieving 32767 * 2 ^ n - 1 very deeply now (and busy testing it at the first few millions of bits or so - each time narrowing down the boundaries of the sieve domain).

Well deeply -that's...
Forum: Riesel Prime Search 2020-11-21, 15:08
Replies: 68
Views: 18,324
Posted By diep
finished thanks to big work of Paul until 7M. I'm...

finished thanks to big work of Paul until 7M. I'm still having a few cores above 7M.

If someone wants to take over let me know. For my current (outdated) hardware i'm at the limits of what is...
Forum: Riesel Prime Search 2020-11-21, 15:02
Replies: 1,000
Views: 115,759
Posted By diep
Too bad you didn't find anything k=89 * 2^n - 1...

Too bad you didn't find anything k=89 * 2^n - 1 until 4M.

Taking over k=89 then. will search it then from 4M to 6M (or maybe 7M) and then release it again probably will let you know when i release...
Forum: Software 2020-11-05, 23:35
Replies: 46
Views: 8,604
Posted By diep
Which LLR version is adviced to run on old AMD...

Which LLR version is adviced to run on old AMD magny cours processors?

Have 48 core box operational with magny cours 2.2ghz processors.
Very happy about it.

LLR gives CPU fault.

That would...
Forum: Software 2020-10-12, 15:32
Replies: 46
Views: 8,604
Posted By diep
Seems scale better the 3.8.24b2 but it's a lot...

Seems scale better the 3.8.24b2 but it's a lot slower on my machine here.

I tried under linux 64 bits at dual socket Xeon L5420 machine at 4 threads the new version 3.8.24b2
...
Forum: Programming 2020-07-22, 15:22
Replies: 14
Views: 4,542
Posted By diep
i wrote that mul_limbs code like 15 years ago. ...

i wrote that mul_limbs code like 15 years ago. maybe GCC got a lot more clever lately :)

Back then you can bet i cried it out loud like a wounded Bear that GCC was duckslow optimizing it back...
Forum: Programming 2020-07-22, 06:30
Replies: 14
Views: 4,542
Posted By diep
64x64 integer multiplication GCC

Good Morning!

Looking for way of multiplying fast in GCC 64x 64 bits unsigned 64 bits integers and obtaining both highres as well as lowres result.

Was busy reviving CUDA sieving code i wrote...
Forum: Wagstaff PRP Search 2020-07-13, 21:01
Replies: 190
Views: 41,917
Posted By diep
Why not take 16.4M to 164M as then at least you...

Why not take 16.4M to 164M as then at least you got some sort of decent odds to find at least 1.

The odds of a PRP in Wagstaff between [n;2n] seems diverging - not converging - and if i may...
Showing results 1 to 25 of 699

 
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