Yambo Community Forum

Posted: **Thu Apr 12, 2018 9:57 am**

I am running a GW PPA calculation of a rather simple bulk material. I am getting a series of warnings

[WARNING] [CPU 0] has no poles
[WARNING]Allocation attempt of X_poles_tab of zero size.
[WARNING]Allocation attempt of ordered_grid_index of zero size.
[WARNING]Allocation attempt of coarse_grid_index of zero size.
[WARNING]Allocation attempt of bare_grid_N of zero size.
[WARNING]Allocation attempt of coarse_grid_Pt of zero size.
[WARNING]Allocation attempt of poles of zero size.
[WARNING]Allocation attempt of Ein_poles of zero size.
[WARNING]Allocation attempt of poles of zero size.
[WARNING]Allocation attempt of Ein_poles of zero size.
[WARNING]Allocation attempt of X_poles of zero size.
[WARNING]Allocation attempt of X_Ein_poles of zero size.
<snip>

and then at the end of the calculation a collection of NaN

What could be the origin of this problem? I tried starting from scratch, i.e., from the QE calculations but I hit the same wall again.

Thanks,
Roberto

Posted: **Thu Apr 12, 2018 10:07 am**

Ciao Roberto,
can you upload the input and report file? I suspect there is some variable not set correctly.
Best,

Daniele

Posted: **Thu Apr 12, 2018 11:45 am**

I am not sure I am authorised to upload attachments...

Roberto

Posted: **Thu Apr 12, 2018 1:02 pm**

Dear Roberto,
I'm not sure you sent me the correct input file as in the report it is indicated as gw_ppa.in, probably you just renamed it.
A possible problem could be that something failed in the default parallelization. I can't see how the parallelization has been set as
it is reported in the log file only, as it looks the cpu1 has zero workload.
You can try to assign a parallelization strategy e.g. using 60 cpus as it seems you are using:

Code: Select all

X_all_q_CPU= "1 2 15 2"                # [PARALLEL] CPUs for each role
X_all_q_ROLEs= "q k c v"              # [PARALLEL] CPUs roles (q,k,c,v)
X_all_q_nCPU_LinAlg_INV= 1     # [PARALLEL] CPUs for Linear Algebra
X_Threads=1                  # [OPENMP/X] Number of threads for response functions
DIP_Threads=1                  # [OPENMP/X] Number of threads for dipoles
SE_CPU= "1 2 30"                     # [PARALLEL] CPUs for each role
SE_ROLEs= "q qp b"                   # [PARALLEL] CPUs roles (q,qp,b)
SE_Threads=1

and see if the problem persists.
Best,
Daniele

Posted: **Thu Apr 12, 2018 1:13 pm**

Dear Daniele,

Thanks I will check your recommendation and see what I get.

Best regards and sorry for the problem with the attachment.

Roberto

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