[Triaxial Test] Tracking analysis process: Print iteration + stop condition

Hi,

> since this is SSH I cannot see at what iteration the calculation is currently at

You can try to login with "ssh -X" (since the server provides graphical stuff)

Hope it helps,

Christian.

Hello,

I'm running YADE via SSH connection on a server at my insitut, since this
> is SSH I cannot see at what iteration the calculation is currently at (via
> the grapĥic interface, I often track the process through this way), because
> via SHH connection the Controller Windows can not start it seems. So can
> anyone tell me what functor in YADE that allow us to call out the current
> iteration that the program is currently calculate? (I want to check via
> iPython console).
>

Do you log out during the simulation, or not? if not, you can use PyRunner
[1] for this purpose:

O.engines = [
  ...
  PyRunner(iterPeriod=50,command="print O.iter"), # change 50 to desired
frequency of prints
]

If you log out during simulation, you can write the iteration to a file
(and open this file to see at what iteration your simulation is), again
using PyRunner.

>
> Another question that concern this , how can I put a stop condition for
> the process, I want the analysis process to stop when the axial deformation
> (epsilon_2, reaches 50%). I read it in the YADE documentation (page 34, 35
> in the PDF version) but it doesn't help me much.
>
> Here is my code: http://pastebin.com/cBuyM0P4
> And here Is what I think I should do:
>
> while triax.strain[1]<0.5
> O.run()
>

either you can use slightly modified version of the solution you proposed (
O.run() itself would run forever.. ):

while triax.strain[1] < 0.5:
  O.run(50,True) # or equivalently O.run(50); O.wait(), see [3]

or you can use solution [2] (again using PyRunner :-):
O.engines = [
  ...
  PyRunner(iterPeriod=50,command="if triax.strain[1] < 0.5: O.pause()"),
]

>
> If so, where to put it, I think I should put it at line L123? I tried it
> but when I tested at my local terminal, it seems to work but the terminal
> stucked and I could not check other data via iPython like normal. (the line
> start with Yade [1] etc... I don't know how to explain better). I want to
> apply this condition, but I still want the iPython available to track
> whenever I want. How can I do that?
>

concerning "stucked terminal": you are still inside while loop (inside your
script) and no IPython is started until the script is finished.
( O.run() itself would cause the script to finish, as O.run() runs in c++,
but it returns to python imediatelly and continues executing python
commands. Therefore normally you would use O.run(); O.wait() pair. )

HTH
good luck
Jan

[1] https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.PyRunner
[2] https://yade-dem.org/doc/user.html#stop-conditions
[3] https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.Omega.run

Hi Hien,

when running scripts on a server I usually use yade's batch mode even if I am just running a script with fixed parameters. Instead of calling yade I call yade-batch. You might have to slightly adapt your script so that you can run it in batch mode (don't use qt module), i.e.

O.bodies.append(box(center=[0,0,0],extents=[.5,.5,.5],color=[0,0,1],fixed=True))
O.bodies.append(sphere([0,0,2],1,color=[0,1,0]))
typedEngine("NewtonIntegrator").gravity=(0,0,-9.81)
typedEngine("NewtonIntegrator").damping=0.1
O.run(2000000,True)
O.wait()
print 'some printout!'

Then I run: nohup yade-batch script.py > script.log &

With nuhup you can even log out and the simulation will still run. If you look at your log file script.log (yade-batch will also create an other one) you can find something like this: http://localhost:9080 shows batch summary

You can use the command line browser lynx to show the summary which shows you at which iteration your simulation is, just type: lynx localhost:9080

HTH
Klaus

Wow, awesome advices I got here, thank you very much.

Christian Jakob, that does the trick, and if I remote from window via PuttY and Xming, just turn on the X11 option, thanks for your hint about the "X factor" :)
Jan Stránský: I prefer the O.run(50); O.wait(), I tried it and it worked as I wished, and thank for the explanation about the while loop.
Klaus Thoeni: much thanks, it looks useful, I'll definitely use it, I concerned a little: with yade-daily, it will be yade-daily-batch, right? Anyway I'll try to figure it out. Bookmarked your suggestion.

Just to complete the variety of possible solutions (if in the future
somebody find it useful), see [1,2]
cheers
Jan

[1] https://answers.launchpad.net/yade/+question/224356
[2] https://yade-dem.org/doc/user.html#python-prompt

2013/3/14 Nguyen Hien <email address hidden>

> Question #224169 on Yade changed:
> https://answers.launchpad.net/yade/+question/224169
>
> Status: Answered => Solved
>
> Nguyen Hien confirmed that the question is solved:
> Wow, awesome advices I got here, thank you very much.
>
> Christian Jakob, that does the trick, and if I remote from window via
> PuttY and Xming, just turn on the X11 option, thanks for your hint about
> the "X factor" :)
> Jan Stránský: I prefer the O.run(50); O.wait(), I tried it and it worked
> as I wished, and thank for the explanation about the while loop.
> Klaus Thoeni: much thanks, it looks useful, I'll definitely use it, I
> concerned a little: with yade-daily, it will be yade-daily-batch, right?
> Anyway I'll try to figure it out. Bookmarked your suggestion.
>
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