[Pw_forum] About restarting ph.x calculation

[James Mao]

Hi everyone,

 

I need some help for restarting ph.x calculations. I searched archives and 
read most posts about it, but still not sure about several things.

 

Basically I need calculate IR and Raman for a pretty big crystal cell. It
generates 
huge scratch files, and of course takes quite a long time. Calculations
definitely 
will be terminated from time to time due to my limited run time on cluster. 

 

So my question:

 

1) Is there any way to assign folder "_ph0" to a different disk from
"prefix.save"? 
I think "prefix.save" from relax calculation is for ph.x to read, and ph.x
will not write 
anything into it, right? "_ph0" is where huge scratch data will be kept and
if possible 
I would like to assign it to local disk on cluster, while keeping
"prefix.save" on host. 
I think "outdir" will assign both to a same location. 

 

2) To restart a ph.x calculation (recover=.true.), which data are necessary?
(do I need 
prefix.save folder? do I need all files under _ph0 folder or just
_ph0\prefix.phsave folder?) 

 

3) Can I calculate several representations at same time by submitting
several calculations 
at same time (assigning differet start_irr and last_irr)? I noticed before
calculating 
representations, electric fields calculation is done first. If I split the
job, will each job 
repeat same electric fields calculation? Any way to skip it if I already
have it done once?

 

Thanks first for any help!

 

btw: is our archives website still working well? It seems recently some
posts I received in 
email cannot be found in the website.

 

Best Regards,

James Mao

-------------------

Postdoc, Department of Chemistry, University of Pittsburgh

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