Got any Betas???

Message boards : Number crunching : Got any Betas???
Message board moderation

To post messages, you must log in.

AuthorMessage
Aurum
Avatar

Send message
Joined: 14 Dec 19
Posts: 68
Credit: 43,074,061
RAC: 59,606
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

ID: 1078 · Rating: 0 · rate: Rate + / Rate - Report as offensive     Reply Quote
bluestang

Send message
Joined: 30 Jun 20
Posts: 5
Credit: 3,221,800
RAC: 0
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?
ID: 1080 · Rating: 0 · rate: Rate + / Rate - Report as offensive     Reply Quote
marsinph

Send message
Joined: 13 Nov 19
Posts: 21
Credit: 2,596,565
RAC: 0
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 !!!
ID: 1083 · Rating: 0 · rate: Rate + / Rate - Report as offensive     Reply Quote
Aurum
Avatar

Send message
Joined: 14 Dec 19
Posts: 68
Credit: 43,074,061
RAC: 59,606
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 :-)
ID: 1084 · Rating: 0 · rate: Rate + / Rate - Report as offensive     Reply Quote
Aurum
Avatar

Send message
Joined: 14 Dec 19
Posts: 68
Credit: 43,074,061
RAC: 59,606
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?
ID: 1085 · Rating: 0 · rate: Rate + / Rate - Report as offensive     Reply Quote
damotbe
Volunteer moderator
Project administrator
Project developer
Project tester
Project scientist
Help desk expert

Send message
Joined: 23 Jul 19
Posts: 288
Credit: 464,119,561
RAC: 236
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...
ID: 1088 · Rating: 0 · rate: Rate + / Rate - Report as offensive     Reply Quote
marsinph

Send message
Joined: 13 Nov 19
Posts: 21
Credit: 2,596,565
RAC: 0
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
ID: 1098 · Rating: 0 · rate: Rate + / Rate - Report as offensive     Reply Quote
Aurum
Avatar

Send message
Joined: 14 Dec 19
Posts: 68
Credit: 43,074,061
RAC: 59,606
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???
ID: 1143 · Rating: 0 · rate: Rate + / Rate - Report as offensive     Reply Quote
damotbe
Volunteer moderator
Project administrator
Project developer
Project tester
Project scientist
Help desk expert

Send message
Joined: 23 Jul 19
Posts: 288
Credit: 464,119,561
RAC: 236
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 ...
ID: 1145 · Rating: 0 · rate: Rate + / Rate - Report as offensive     Reply Quote
Aurum
Avatar

Send message
Joined: 14 Dec 19
Posts: 68
Credit: 43,074,061
RAC: 59,606
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?
ID: 1147 · Rating: 0 · rate: Rate + / Rate - Report as offensive     Reply Quote
damotbe
Volunteer moderator
Project administrator
Project developer
Project tester
Project scientist
Help desk expert

Send message
Joined: 23 Jul 19
Posts: 288
Credit: 464,119,561
RAC: 236
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.
ID: 1152 · Rating: 0 · rate: Rate + / Rate - Report as offensive     Reply Quote

Message boards : Number crunching : Got any Betas???

©2022 Benoit DA MOTA - LERIA, University of Angers, France