Yambo Community Forum

Hello,

I am doing a mid to heavy calculation of GW corrections. About 75 qpts over 6 bands. 300 bands are used.

Input, log and output are attached. You can see the calculation in itself is finished after 18 hours, but gets stuck at the writing phase. Then, after idling, it got killed at the 24 hours limit of the machine I work on.

Is it some kind of netCDF limitation ? Is the IO really that slow ?

Note that I use quite a lot of processors.

If I restart the calculation, is it going to restart the GW part or just retry to write ?

Thanks in advance

Dear Thierry,
my impression is that not all the cpus finished their task and that the calculation is unbalanced.
You have 6 bands and 75 kpoints, which means 450 corrections. I suggest you change the parallelization strategy considering a factor of 450 as "qp". Maintaining the number of cpus you are using a possible strategy could be:
SE_CPU= "1 6 76"

When restarting, Yambo will read the ndb.pp database, but we recalculate the QP correction from scratch as they have not be written in databases.

Best,
Daniele

Thanks a lot, it worked with these parameters.