Got any Betas???

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Aurum
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Message 1078 - Posted: 24 Sep 2020, 19:08:17 UTC

I'm not getting any beta or NWChemLong WUs. Any available?
What's the trick?
Run test applications?	Yes
Run only the selected applications:
NWChem: no
NWChem long: yes
If no work for selected applications is available, accept work from other applications?	no
Max # jobs	No limit
Max # CPUs	No limit

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bluestang

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Message 1080 - Posted: 24 Sep 2020, 21:28:50 UTC - in response to Message 1078.  

Have you checked your Event Log in BOINC to see what it says?
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Message 1083 - Posted: 24 Sep 2020, 22:38:35 UTC - in response to Message 1078.  

I'm not getting any beta or NWChemLong WUs. Any available?
What's the trick?
Run test applications?	Yes
Run only the selected applications:
NWChem: no
NWChem long: yes
If no work for selected applications is available, accept work from other applications?	no
Max # jobs	No limit
Max # CPUs	No limit




Because you not eat belgian waffles !!!
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Message 1084 - Posted: 25 Sep 2020, 1:10:52 UTC

That is such a good idea! I'm going to get out my waffle maker and treat my kids to Belgian waffles with peanut butter and hot maple syrup :-)
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Aurum
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Message 1085 - Posted: 25 Sep 2020, 1:14:52 UTC

Server Status says there's 2038 NWChem Long WUs unsent but my log says, "No tasks are available for NWChem long."

Since this morning it's gone from 1 user to 5 so maybe they'll come when they come.

Does the client request betas or are they just sent by the server as available and so nothing would be in my log unless it actually arrived?
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damotbe
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Message 1088 - Posted: 25 Sep 2020, 6:30:58 UTC - in response to Message 1085.  

I confirm : it remains NWChem long tasks. The scheduler manage both "nwchem" and "nwchem long" WU. It seems that the mix is not well balanced...
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Message 1098 - Posted: 25 Sep 2020, 14:52:56 UTC - in response to Message 1084.  

That is such a good idea! I'm going to get out my waffle maker and treat my kids to Belgian waffles with peanut butter and hot maple syrup :-)



With ice cream, no peanuts butter (too fat)
All depend the kind of Belgiums waffle.
There two main, but also https://en.wikipedia.org/wiki/Lacquemant_waffles
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Aurum
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Message 1143 - Posted: 15 Oct 2020, 11:41:28 UTC

I've been watching beta t1, t2 & t4s running and I can't tell the difference. Their Properties say they have the same 500 TLOPs. They run the same speed. Why doesn't t2 run twice as fast as t1 and t4 four times as fast as t1???
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Message 1145 - Posted: 16 Oct 2020, 6:29:42 UTC - in response to Message 1143.  

Depending on the step of the computation some piece of code are sequential and other required too many synchronization to be effective. Amdahl's law ...
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Message 1147 - Posted: 16 Oct 2020, 12:18:03 UTC
Last modified: 16 Oct 2020, 12:21:03 UTC

With only anecdotal data I'm not seeing anything close to Amdahl's Law. This is what I'm seeing: t(1) ~ t(2) ~ t(4)
Amdahl's Law might say 1.95*t(1) = t(2) or 3.67*t(1) = t(4).
https://www.pugetsystems.com/labs/articles/Estimating-CPU-Performance-using-Amdahls-Law-619/

So it's not that t(4) is working on a larger molecule than t(1) but that parallelization isn't working?
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Message 1152 - Posted: 20 Oct 2020, 9:17:03 UTC - in response to Message 1147.  

Amdahl's Law is parametric and depends of proportion of parallelized code. If this proportion is 0%, the law is t(1) = t(2) = t(4) = t(inf)
The example you looked at is for 97%.

Because I don't write NWChem's code, I don't know how the size of the molecules play a role in effiency. We had been asked for multicore versions, but for small molecules, Thomas (the chemist) is confident about the fact that it is useless and thus, a waste of ressources. That's why it is in beta and people are responsible of the usage of this feature.
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Message boards : Number crunching : Got any Betas???

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