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Ulrich Metzner
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Message 68982 - Posted: 22 Aug 2019, 7:02:38 UTC

Hello,

a new series of invalids is building up. Again all invalids are from the same run, they are from:
de_modfit_85_bundle4_4s_south4s_bgset_2_1564052102_xxxxxxx

See here:
https://milkyway.cs.rpi.edu/milkyway/results.php?userid=1043858&offset=0&show_names=0&state=5&appid=
Aloha, Uli

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Daedalus

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Message 68984 - Posted: 24 Aug 2019, 14:20:33 UTC

Yep, i just discovered it too. Again a "85" run. The other time it was "84" AND "85" runs.

I will crunch some Einstein until they figure out their stuff and communicate clearly that it has been definitively fixed.
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alanb1951

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Message 68985 - Posted: 25 Aug 2019, 2:14:32 UTC

This has been anticipated for stripes 84 and 85. As they approach optimization, the tiny differences in accuracy of various GPUs compared with one another (and with CPUs) is causing discrepancies that are large enough to cause failure to validate. It is presumably a characteristic of the particular data set(s) and it is quite possible that it can't be "fixed" (as [most?] GPUs don't do calculations and rounding on very small numbers in quite the same way that modern CPUs do...)

By the way, Tom Donlon mentioned that these stripes might start to show errors in his News post that introduced the latest set of batches - see https://milkyway.cs.rpi.edu/milkyway/forum_thread.php?id=4487[/i]
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Miklos M

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Message 68988 - Posted: 27 Aug 2019, 12:15:10 UTC

Getting several invalid results, such as this one:
name de_modfit_85_bundle4_4s_south4s_bgset_2_1564052102_10340141
application Milkyway@home Separation
created 26 Aug 2019, 3:00:26 UTC
canonical result 299838550
granted credit 244.01
minimum quorum 1
initial replication 4
max # of error/total/success tasks 2, 9, 6

What can i do about them?

Thank you
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Miklos M

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Message 68989 - Posted: 27 Aug 2019, 12:16:28 UTC - in response to Message 68984.  

Makes sense to me.
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TB

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Message 68996 - Posted: 31 Aug 2019, 2:22:43 UTC - in response to Message 68988.  

My CPU is slow. When I see a batch that has fairly high levels of invalid responses, as soon as they download I abort them and chuck them back into the "available for sending" pool.

That's about it. It's a CPU thing, which means ultimately it's a software issue, either in the code or depending on some difference in how the different CPUs crunch numbers.
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Profilemikey
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Message 68997 - Posted: 31 Aug 2019, 12:14:49 UTC - in response to Message 68988.  

Getting several invalid results, such as this one:
name de_modfit_85_bundle4_4s_south4s_bgset_2_1564052102_10340141
application Milkyway@home Separation
created 26 Aug 2019, 3:00:26 UTC
canonical result 299838550
granted credit 244.01
minimum quorum 1
initial replication 4
max # of error/total/success tasks 2, 9, 6

What can i do about them?

Thank you


Read the News section maybe?

From the 27th:
Hi everyone,

Stripes 84 and 85 are beginning to return invalids, as was expected. I will pull them down in a couple days when I am back in the lab.

Best,
Tom
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Message boards : Number crunching : New series of invalids

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