HiGEM run crashes, job xgvwe

[till]

I've set up a new HiGEM run, with a 1%CO2 atm. CO2 increase. It's job xgvwe. OIt runs fine for just over half a year but then crashes. I've tried simply re-starting it but to no avail. In the leave file, the crucial line seems to be:

BUFFIN: Read Failed: No such file or directory
_pmiu_daemon(SIGCHLD): [NID 02342] [c5-1c2s3n2] [Mon May 13 15:07:10 2013] PE RANK 57 exit signal Segmentation fault
[NID 02342] 2013-05-13 15:07:10 Apid 4580768: initiated application termination

You can find the leave file here:
/home/n02/n02/till/um/umui_out/xgvwe000.xgvwe.d13133.t152421.leave

Many thanks for your help!

[willie]

Hi Till,

The last leave file from the continuation run, xgvwe006…, shows that there is a segmentation fault, but no read failure. When the model has been running for this length of time, this suggests that it has become unstable. To check this out you could,

• switch the flush modset back on
• in scientific sections > section select DIAG_PRN and change the printing frequency to every time step, and the threshold from 0.4 to 10.0.
• in Output Options, select extra diagnostic messages.
• restart from the last valid start dump, which I think is xgvwea.dat15l0

If it then has a seg. fault., we can think about halving the time step , or other measures.

Regards,

Willie

[willie]

The user solved the problem as follows:

I changed the parameter "targeted diffusion: vertical velocity test value" from 0.4 to 0.5 to avoid the grid point storm forming. (This is in that section 13, button "TARG".)