yade-dev team mailing list archive

[Klaus Thoeni <klaus.thoeni@xxxxxxxxx>]

Hi guys,

yes, you have to try it several times in order to reproduce the strange 
behaviour.

However, I found out a bit more. Actually it might be a problem with multi-
threading. Maybe someone can try to reproduce the behaviour. The following 
link provides a slightly modified version my script and a bash script which 
allows for several executions for -j1 and -j2 (before running the script make 
sure it is executable 'chmod +x runscript'). In addition I included as well my 
results.

http://bit.ly/rtN0w3

Something very strange is that my desktop has the same problem even with -j1 
(eaven cpu usage is more than 100% and I have no idea why) whereas my notebook 
gives the right results in that case (cpu usage is max 100%) just have a look 
at the graphs. It would be good to find out if this problem effects just me or 
if it is a general problem in YADE. Any hints are welcome and I really 
appreciate your help!

Thanks 

Klaus

On Thu, 6 Oct 2011 07:58:24 PM Bruno Chareyre wrote:
> I tried the script and didn't find the problem. It needs more runs
> maybe. But first, could you explain how you use the function (in a
> periodic engine/ live typing/a command in the script)? It would help
> understanding what happens.
> 
> Bruno
> 
> On 06/10/11 07:53, Klaus Thoeni wrote:
> > Hi Anton,
> > 
> > I tired it already (I know this issue), still the same behaviour. And now
> > actually I got zero for Bruno's branch as well. Very strange :-(
> > Not sure what the problem is. Would be great if someone could try if
> > he/she gets the same behaviour.
> > 
> > Thanks,
> > Klaus
> > 
> > On Thu, 6 Oct 2011 04:30:53 PM Anton Gladky wrote:
> >> Hi Klaus,
> >> try to start your script with -j1 option.
> >> There are sometimes some issues with "numerical" error in multi-thread
> >> mode.
> >> 
> >> Anton
> >> 
> >> On Thu, Oct 6, 2011 at 6:40 AM, Klaus Thoeni <klaus.thoeni@xxxxxxxxx> 
wrote:
> >>> Hi guys,
> >>> 
> >>> I just wanted to use the function unbalancedForce in one of my scripts.
> >>> And look what is happening: running the same simulation several times
> >>> after each other gives different results for the unbalancedForce. Well
> >>> either some values which seem all right or just zero. The script I used
> >>> is:
> >>> examples/WireMatPM/wirecontacttest.py
> >>> 
> >>> Even using different computers and different versions of yade gives
> >>> this problem. However, it doesn't happen all the time. It seems like
> >>> you have to try several times to get the wrog value (which is zero)
> >>> for unbalancedForce and if I use Bruno's collide2 branch it seems to
> >>> work all the time.
> >>> 
> >>> So I don't know if it is a problem with my script or a problem of the
> >>> current trunk version. Can anyone reproduce this problem?
> >>> 
> >>> Thanks
> >>> Klaus
> >>> 
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