Trial Factoring with gpuOwl about gpuowl HOT 13 CLOSED

Two questions:

1. does it find factors?
2. with a competitive speed, to be worth it?

from gpuowl.

Two questions:

1. does it find factors?

I would need an already factored exponent that is known to have factors to test...

2. with a competitive speed, to be worth it?

absolutely, it is very fast, faster than my RX Vega 64.

and I have tested running both PRP and TF on the same GPU at the same time and there was very little performance dropdown !

from gpuowl.

I found an exponent to test which is known to have factors because I have already computed it:

• Exponent: 199999673
• Bitlevel: 74-75
• Factor: Factor: 20677946129698001050849

will post the result here.

from gpuowl.

I found an exponent to test which is known to have factors because I have already computed it:

* Exponent: 199999673

* Bitlevel: 74-75

* Factor: Factor: 20677946129698001050849

will post the result here.

2021-06-05 18:29:46 {"exponent":"199999673", "worktype":"TF", "status":"F", "program":{"name":"gpuowl", "version":"4.7-5b01b65-mod"}, "timestamp":"2021-06-05 16:29:46 UTC", "aid":"715A1D17BA9C63A6CCC66D09A3D3790B""bitlo":74, "bithi":75, "begink":"47223742025460", "endk":"94456847945460", "rangecomplete":false, "factors":["51694949845488"]}
2021-06-05 18:29:46 Bye

from gpuowl.

I found an exponent to test which is known to have factors because I have already computed it:

* Exponent: 199999673

* Bitlevel: 74-75

* Factor: Factor: 20677946129698001050849

will post the result here.

2021-06-05 18:29:46 {"exponent":"199999673", "worktype":"TF", "status":"F", "program":{"name":"gpuowl", "version":"4.7-5b01b65-mod"}, "timestamp":"2021-06-05 16:29:46 UTC", "aid":"715A1D17BA9C63A6CCC66D09A3D3790B""bitlo":74, "bithi":75, "begink":"47223742025460", "endk":"94456847945460", "rangecomplete":false, "factors":["51694949845488"]}
2021-06-05 18:29:46 Bye

That is another factor, what it means?

from gpuowl.

Have a look here:
https://www.mersenne.ca/exponent/199999673
the factors are of the form 2* k *exponent -1, and what is reported above is the "k" for the factor. Can easily be changed between the two.

from gpuowl.

Have a look here:
https://www.mersenne.ca/exponent/199999673
the factors are of the form 2* k *exponent -1, and what is reported above is the "k" for the factor. Can easily be changed between the two.

So the program is working, it only needs adapting the result line so that Primenet accepts it...

from gpuowl.

Have a look here:
https://www.mersenne.ca/exponent/199999673
the factors are of the form 2* k *exponent -1, and what is reported above is the "k" for the factor. Can easily be changed between the two.

So the program is working, it only needs adapting the result line so that Primenet accepts it...

Ok, and also primenet.py needs the TF (2) worktype to fetch trial factoring work.

from gpuowl.

Here's some benchmark for trial factoring exponent 218812621, bitlevel 73-74:

Radeon VII:

• GHz: 710-790
• ETA: 17 minutes

Radeon Pro VII:

• GHz: 780-890
• ETA: 16 minutes

from gpuowl.

Here's some benchmark for trial factoring exponent 218812621, bitlevel 73-74:

Radeon VII:

* GHz: 710-790

* ETA: 17 minutes

Radeon Pro VII:

* GHz: 780-890

* ETA: 16 minutes

For comparison: benchmark for mfakto on RX Vega 64, same exponent, same bitlevel:

• GHz/day: 634.55
• ETA: 19m44s

from gpuowl.

@preda Can you tell me just where is the code for the output line so that I can try to fix it?

from gpuowl.

@preda Can you tell me just where is the code for the output line so that I can try to fix it?

Tired of waiting for your reply, I went ahead and found it.
For contribution I share the command I used to find the code for output line:

find . -type f -exec grep -H 'bitlo' {} \;

which produces:

./Results.cpp:   snprintf(buf, sizeof(buf), "\"bitlo\":%u, \"bithi\":%u, \"begink\":\"%llu\", \"endk\":\"%llu\", \"rangecomplete\":%s%s",
Binary file ./openowl matches

This allowed me to add the comma before bitlo. Now I only need to understand why the timestamp is not accepted by Primenet.

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I will open a discussion for this topic.

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