How to start a computation from a previous one ?

[salettid]

Hello,
I've done a computation with Damask grid. Let's call it compA.
I would like to get the results of compA (up to this, it's ok) and then launch a new computation with an additionnal increment of load that would start from the end of compA without repeating it.
How can it be handled in Damask. I saw some restart option but not sure on how it can be used.

Thanks.

[hyharry]

in your load file, you can specify the interval to write restart with keyword f_restart, and you know the last load increment n_restart where a restart is written. then you can resume your simulation with the command like this

DAMASK_grid -g geom.vti -l load.yaml -m material.yaml -r n_restart

the simulation will then resume at n_restart and then continue with the added loadsteps in your load.yaml

[salettid]

Thanks.
But how does it know from which computation to restart ? Is it looking at the last hdf5 file result ?

For instance, I'm doing a first computation, in my command line, I write the command :
DAMASK-grid -g geom.vti -l load.yml -m material.yaml
In the first load.yaml file, I specify f_restart = 1, for instance.

I get the results, do some post-processes and decide to go a step further, restarting from the last increment. I detect that the last increment is the 200th . I add a loadcase at the end of my initial load.yaml file and write :

DAMASK_grid -g geom.vti -l load.yaml -m material.yaml -r 200 ?

Sorry if I'm not clear enough ...

[hyharry]

in load.yaml one can specify f_out (output frequency for result.hdf5) and f_restart (restart output frequency which always overwrites a restart.hdf5). When restarting, simulation will refer to the last written restart increment n_restart (according to your f_restart) not the last recording in your result.hdf5 (according to your f_out).

to determine the last restart increment, you can check your screen output for the last restart statement, or if you redirect this stdout to a log file, then you should be able to search the last restart statement in your log file.

You could also have a look at our documentation page for further information.

Hope it clarifies your question.

[salettid]

Thanks.
I can now restart from the desired increment but I get error message regarding an error in H5Gcreate2() function.
I am using 3.0.0-beta.

By the way, the documentation page is not dealing with an int as arg of -r option.

Thanks again.

[MarDiehl]

By the way, the documentation page is not dealing with an int as arg of -r option.

thanks, will fix that.