...
As with Um_lance, Chunk_lance needs to get executed from the config file directory and the model environment needs to have been set. To start a simulation from the beginning add the key '-start';
| Volet |
|---|
| Chunk_lance -start |
To start a new simulation or continue a stopped simulation just execute the command without any key:
| Volet |
|---|
| Chunk_lance |
The wallclock time for which one chunk_job will be running can be set in the file 'configexp.dot.cfg' with the parameter 'BACKEND_time_mod'.
In case the model job fails it will automatically get reexecuted a second time.
Chnk_lance offers the option of re-executing a model job multiple times in case of a crash. The key '-attempts' can be used to tell Chunk_lance how many time to re-execute a model job.
'-attempts 1' means just one attempt,
'-attempts 1' means two attempts, etc.
Depending on the version you are using the default is 1 or 2. You can check the default with the command:
| Volet |
|---|
| Chunk_lance -h *** SEQUENCE D'APPEL *** Chunk_lance [positionnels] IN -attempts [1:1] Restart attempts IN -start [0:1] Restart simulation from beginning IN -nosoumet [0:1] Do not submit but execute chunk_job [-- positionnels] |
In case the whole simulation crashes, it can easily get resubmitted by executing 'Chunk_lance' again.
Note:
To know where the simulation was, Chunk_lance is using a log file called 'chunk_job.log'. The chunk_job itself will check this file to determine which job to execute next. Therefore this log file should not be touched.
However, to rerun part of a simulation one can alter the log file by hand. Just make sure there is never a blank line at the end of the log file since the chunk_job only checks the very last line of the log file!
But sometimes Sometimes it happens that part of the restart files gets overwritten before a month is finished or that the restart files are corrupted. In that case we cannot just relaunch the month with Chunk_lance but have to get the original last uncorrupted restart files back (from the previous month) etc. and restart the simulation from there.
...