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Search: Posts Made By: Prime95
Forum: News 2020-07-04, 20:44
Replies: 87
Views: 3,058
Posted By Prime95
The last details were ironed out by email. ...

The last details were ironed out by email. Mihai started a wiki at gpuowl that we should update.
Forum: News 2020-07-04, 20:43
Replies: 87
Views: 3,058
Posted By Prime95
I think Prime95 will default to allocating the...

I think Prime95 will default to allocating the disk space upfront so that the test does not get 89% complete and run into a disk full error. Better to get a disk full error upfront and drop the...
Forum: News 2020-07-04, 03:30
Replies: 87
Views: 3,058
Posted By Prime95
I understand. My "dream machine" builds of 5...

I understand. My "dream machine" builds of 5 years ago have 32GB disks feeding 5 (formerly 7) CPUs.
Forum: News 2020-07-04, 03:10
Replies: 87
Views: 3,058
Posted By Prime95
Prime95 can now generate proofs. Can't upload...

Prime95 can now generate proofs. Can't upload them or verify them, but it is a start.

Some interesting data and a decision to be made.

For a 100Mbit number, the optimal proof power is 10. ...
Forum: GpuOwl 2020-06-27, 16:59
Replies: 3
Views: 161
Posted By Prime95
I "tidied up" the code by remove pragmas that...

I "tidied up" the code by remove pragmas that told the compiler that gpuowl requires 64-bit base and extended atomics. In fact the 64-bit base atomics are used in one place. The AMD OpenCL didn't...
Forum: Math 2020-06-24, 20:02
Replies: 194
Views: 7,483
Posted By Prime95
In choosing the hash function, we are really...

In choosing the hash function, we are really guarding against a researcher discovering a weakness in the system that is not presently known.

If the future weakness is a reduction in brute force...
Forum: Math 2020-06-24, 19:48
Replies: 194
Views: 7,483
Posted By Prime95
Some data (now using the attached sliding window...

Some data (now using the attached sliding window exponentiation routine)

Proof level 8:
Proof generator does 15489 or 20632 squarings (48-bit vs 64-bit hash)
Server does 1080 or 1414 squarings...
Forum: News 2020-06-23, 23:03
Replies: 87
Views: 3,058
Posted By Prime95
Indeed. Pavel Atnashev has improved our...

Indeed.

Pavel Atnashev has improved our original concept of the workflow (see post 46 (https://mersenneforum.org/showpost.php?p=548565&postcount=46)). We think the Primenet Server can handle...
Forum: Math 2020-06-23, 03:01
Replies: 194
Views: 7,483
Posted By Prime95
Silly me. The code did not work for 64-bit ints....

Silly me. The code did not work for 64-bit ints.



We're not talking about the hash values. This is the A[N]^random value sent to the user to run topK/(2^N) squarings. The user's result is...
Forum: Math 2020-06-23, 01:12
Replies: 194
Views: 7,483
Posted By Prime95
I changed my random exponent to a prime number...

I changed my random exponent to a prime number between 33 and 48 bits. Stole some Rosetta C code for Miller-Rabin test.
Forum: Math 2020-06-23, 01:09
Replies: 194
Views: 7,483
Posted By Prime95
Residues are written to disk as the PRP test...

Residues are written to disk as the PRP test progresses. At test end, the residues are read from disk - only one in memory at a time - to produce the proof.

I took "grouped" to mean that we do...
Forum: Math 2020-06-22, 15:53
Replies: 194
Views: 7,483
Posted By Prime95
They are grouped. A very simple recursive...

They are grouped. A very simple recursive routine does the trick.
Forum: Math 2020-06-22, 09:11
Replies: 194
Views: 7,483
Posted By Prime95
This is easier to code than I expected! I just...

This is easier to code than I expected! I just created a power=8 proof of M216091 and successfully verified it.

Using 48-bit hashes, the proof construction cost was the equivalent of 15K...
Forum: Information & Answers 2020-06-21, 19:27
Replies: 18
Views: 639
Posted By Prime95
LOL, guilty. Mlucas FFTs are written...

LOL, guilty.



Mlucas FFTs are written in C, Prime95 in assembly. Try looking in the Mlucas subforum as Ernst has often benchmarked Mlucas against Prime95. Prime95 is not twice as fast as...
Forum: News 2020-06-21, 05:31
Replies: 87
Views: 3,058
Posted By Prime95
You understand correctly.

You understand correctly.
Forum: PrimeNet 2020-06-21, 01:57
Replies: 3
Views: 120
Posted By Prime95
A simple solution might be to use one user ID. ...

A simple solution might be to use one user ID. You can distribute that ID without the password and everyone will be able to get work and report results. Each user can create unique computer names...
Forum: GpuOwl 2020-06-20, 21:46
Replies: 2,360
Views: 128,818
Posted By Prime95
You need to rerun this. This time make sure that...

You need to rerun this. This time make sure that the still-running 5.5M job's timings do not change during each of the above tests. I've often seen nutty timings. Just yesterday, one of my 5M FFTs...
Forum: News 2020-06-20, 08:13
Replies: 87
Views: 3,058
Posted By Prime95
I suspect a University is least likely to be...

I suspect a University is least likely to be affected by bandwidth. Temp disk space could be another matter. Random secretary/student/professor will not be happy if prime95 eats up the last few GB...
Forum: Soap Box 2020-06-20, 03:31
Replies: 1,191
Views: 45,367
Posted By Prime95
Huh???? So FDR should try to lose WWII because...

Huh???? So FDR should try to lose WWII because if the Allies are winning it will help him get re-elected which is a conflict of interest.
Forum: News 2020-06-20, 03:27
Replies: 87
Views: 3,058
Posted By Prime95
Latest improvements/updates from the technical...

Latest improvements/updates from the technical discussions.

For an exponent around 100,000,000. We can default to power==7, requiring 1.5GB of disk space during the test, and a 100MB proof file...
Forum: Math 2020-06-20, 00:21
Replies: 194
Views: 7,483
Posted By Prime95
I was thinking a 256-bit SHA-3 result.

I was thinking a 256-bit SHA-3 result.
Forum: News 2020-06-19, 20:07
Replies: 87
Views: 3,058
Posted By Prime95
The files are "fat free". After a GEC check,...

The files are "fat free".

After a GEC check, both matching GEC values are written to the save file. Why? If we only write one value and bit rot sets in after the GEC check and before the the...
Forum: Math 2020-06-19, 19:57
Replies: 194
Views: 7,483
Posted By Prime95
Ah, that makes much more sense. Bonus, the...

Ah, that makes much more sense. Bonus, the server upon receiving the big proof file can immediately perform the steps to calculate A[N-1], B[N-1] and discard all the middle values in the proof file,...
Forum: Math 2020-06-19, 16:56
Replies: 194
Views: 7,483
Posted By Prime95
So, let's see if I understand correctly (my track...

So, let's see if I understand correctly (my track record is not too good there). Using preda's terminology in post 17 (https://mersenneforum.org/showpost.php?p=546560&postcount=17), the server...
Forum: Math 2020-06-19, 15:23
Replies: 194
Views: 7,483
Posted By Prime95
Compromise, 48-bits? Algorithm: x =...

Compromise, 48-bits?

Algorithm:
x = sha-3-256(something)
x = x & (2^48 - 1)
if (x < 2^32) x += 2^48
x = x | 1
while (some combo of x divisible by 3,5,7 or x is composite or x ==...
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