The search up to 10^20

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Sergei Chernykh
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Message 521 - Posted: 30 Jun 2017, 16:11:33 UTC

It will be started tomorrow (July 1st)!

I've decided to speed up the launch of the next search due to performance issues with GPU version that everyone experiences now.

What will happen on July 1st:

1) "Amicable Numbers up to 10^20" application will start receiving tasks.
2) All GPU versions for the old application "Amicable Numbers up to 2^64" will be deprecated.
3) Credit points for both applications will be re-balanced to make sure that RAC doesn't change.

So all GPUs should automatically switch to the new application, and the old application will remain as CPU-only until it finishes.
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Henrik Nilsson

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Message 522 - Posted: 30 Jun 2017, 17:22:13 UTC - in response to Message 521.  

>So all GPUs should automatically switch to the new application,
>and the old application will remain as CPU-only until it finishes.

But there will also be CPU tasks for the 10^20 application right from the start, correct?
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Sergei Chernykh
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Message 523 - Posted: 30 Jun 2017, 17:34:05 UTC - in response to Message 522.  
Last modified: 30 Jun 2017, 17:36:14 UTC

But there will also be CPU tasks for the 10^20 application right from the start, correct?

Yes. You can see all application versions here: https://sech.me/boinc/Amicable/apps.php
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mmonnin

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Message 529 - Posted: 30 Jun 2017, 23:53:15 UTC

Will there be more pairs to be found to count towards the badge?
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Sergei Chernykh
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Message 530 - Posted: 1 Jul 2017, 6:41:07 UTC - in response to Message 529.  

Will there be more pairs to be found to count towards the badge?

There are ~1,750,000 undiscovered pairs in the range 2^64 ... 10^20. Since each pair is found by two different users usually, it means ~3,500,000 "to be found to count". But this will all happen over a long period of time (more than a year), because this search range is much larger than before.
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Profile Su_Root@jisaku

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Message 536 - Posted: 1 Jul 2017, 16:42:50 UTC

Thank you!
My GPU load is 100% and CPU load is only 2%
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pancho

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Message 537 - Posted: 1 Jul 2017, 21:19:47 UTC

Is there any way I could convince you to reduce the required VRAM back to 1.5gb? I've had to switch projects on a bunch of my boxes because I saw that they were no longer acceptable by only 375 mb or so....
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Sergei Chernykh
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Message 544 - Posted: 2 Jul 2017, 8:44:14 UTC - in response to Message 537.  

Is there any way I could convince you to reduce the required VRAM back to 1.5gb? I've had to switch projects on a bunch of my boxes because I saw that they were no longer acceptable by only 375 mb or so....

I can reduce it, but the problem is that the GPU version will still try to use more than 1.5GB when it runs.
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nomarski

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Message 552 - Posted: 3 Jul 2017, 14:22:36 UTC

One more sad Boincer here. I have to give up my Amicable Numbers contribution because of the 2GB memory requirement. Is this because the computing becomes more complex now? Or can we expect this limit getting lower again somewhere in the future?
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Sergei Chernykh
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Message 553 - Posted: 3 Jul 2017, 15:48:58 UTC - in response to Message 552.  

One more sad Boincer here. I have to give up my Amicable Numbers contribution because of the 2GB memory requirement. Is this because the computing becomes more complex now? Or can we expect this limit getting lower again somewhere in the future?

The algorithm has to store and use all prime numbers up to square root of N*2 where N is the search limit. After we switched to 10^20, this prime numbers table requires ~1208 MB alone, other internal buffers also increased in size a bit, so the program doesn't even fit in 1.5 GB anymore.
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Felix_M_

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Message 613 - Posted: 16 Aug 2017, 10:04:41 UTC

i know its early for this question , but what will be after 10^64?
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Sergei Chernykh
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Message 614 - Posted: 16 Aug 2017, 11:41:54 UTC - in response to Message 613.  

I haven't decided yet. The search up to 10^20 will take more than 4 years at current speed, so 10^21 will take more than 40 years which is just too much. So it all depends on how many volunteers will be running the project in 4 years from now.
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Felix_M_

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Message 615 - Posted: 16 Aug 2017, 11:57:18 UTC

okay thank you
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