yade-dev team mailing list archive

[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>]

Good to hear!
Thank you for reporting, it made me spot the problem with clump.

Bruno

On 31/01/12 00:59, Klaus Thoeni wrote:
> Hi Bruno,
>
> thanks for having a look at my scripts!
>
> I know that the clump is disappearing sometimes on the display but the 
> simulation itself seems to be ok so I never had a closer look at it. But it 
> was good you did ;-)
>
> I just had a look at rev 3010 and now I got some speed up too which is great. 
> I will get rid of the GravityEngine and just use NewtonIntegrator::gravity.
>
> Thanks again,
>
> Klaus
>
>
> On Tue, 31 Jan 2012 08:02:30 AM Bruno Chareyre wrote:
>>>>   (Don't use Newton::gravity though, it breaks something in your
>>>>
>>>> script and I'm still investigating).
>>> It is not related to the new Newton::gravity, it only revealed another
>>> bug in eigen's quaternions.
>>> In your script, Klaus, the clump sometimes disappear, did you notice? It
>>> is because the axisAngle conversion of clump members orientation is nan
>>> from time to time
>> Actually, no... The nan quaternions break the display but they seem to
>> be harmless. The problem was https://bugs.launchpad.net/yade/+bug/923929
>> It is fixed in bzr3009. Below is what I get with your 02_net-wall_par.py
>> script Klaus (-j2, default collider setting, for 3009 this is without
>> gravity engine).
>> The speedup is only 25%. As said before, it can't be much better since
>> the collider takes only 14% of total time initially.
>> Still, all engines are a bit faster. :)
>>
>> Bruno
>>
>>
>> bzr2999
>> Name
>> Count                 Time            Rel. time
>> ---------------------------------------------------------------------------
>> ---------------------------- ForceResetter                                 
>>    20050
>> 7068191us                3.38%
>> InsertionSortCollider                              1855
>> 29429129us               14.06%
>> InteractionLoop                                   20050
>> 92135400us               44.03%
>> "gravity"                                         20050
>> 23556447us               11.26%
>> "newton"                                          20050
>> 57063846us               27.27%
>> TOTAL
>> 209253016us              100.00%
>>
>> bzr3009
>> Name
>> Count                 Time            Rel. time
>> ---------------------------------------------------------------------------
>> ---------------------------- ForceResetter                                 
>>    20050
>> 7087997us                4.68%
>> InsertionSortCollider                               634
>> 11046290us                7.29%
>> InteractionLoop                                   20050
>> 80287582us               52.98%
>> "newton"                                          20050
>> 53130390us               35.06%
>> TOTAL
>> 151552261us              100.00%
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-- 
_______________
Bruno Chareyre
Associate Professor
ENSE³ - Grenoble INP
11, rue des Mathématiques
BP 46
38402 St Martin d'Hères, France
Tél : +33 4 56 52 86 21
Fax : +33 4 76 82 70 43
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