[Wien] Query regarding running less cpu core than available in the machine

[Peter Blaha]

You have to explain exactly what you are doing and what the jobs do or not.

a) How did you compile wien2k ? ifort or gfortran ??? Which blas ?

b) I do not understand your statement:

>                 I have seen it directly from cpu monitor. The usage of 
> the cpus are 100% at all the 48 cpus (24 core). I have started 4 
> calculations & the cpu usage are as follows:
> lapw1  2400
> lapw1  600
> lapw1  400
> lapw1  100

So you had 24 cores, 6 cores, 4 cores and only 1 core on the 4 jobs ???
They are all different, aren't they ??

Why are you saying they use 48 (or 24 cores) ???

What is "cpu monitor" ???

What are the case.dayfile outputs telling you ???

I'd like to see the timing lines in the dayfiles.

The timing should be different for these 4 jobs ....


> 
> Eagerly waiting for your advice.
> 
> with regards,
> 
> On Mon, 8 Jul 2019 at 21:33, shamik chakrabarti 
> <shamik15041981 at gmail.com <mailto:shamik15041981 at gmail.com>> wrote:
> 
>     Dear Sir,
> 
>                     I have seen it directly from cpu monitor. The usage
>     of the cpus are 100% at all the 48 cpus (24 core)
> 
>     On Mon, 8 Jul 2019 at 21:11, Peter Blaha
>     <pblaha at theochem.tuwien.ac.at <mailto:pblaha at theochem.tuwien.ac.at>>
>     wrote:
> 
>         How did you find out that it has taken all 24 cores ?
> 
>         Am 08.07.2019 um 13:06 schrieb shamik chakrabarti:
>          > Dear wien2k users,
>          >
>          >                               I have installed wien2k in a
>         system having
>          > Ubuntu. If I set OMP_NUM_THREAD = 2/3/4, it is taking all the
>         available
>          > 24 cores. Whereas if I set OMP_NUM_THREAD = 1 it is taking
>         only 1 cpu
>          > per calculation. My query is how can I use more than 1 cpu
>         but less than
>          > the total available cores (say I want to use 20 cores while
>         total
>          > available cores are 24)..
>          >
>          > Any response in this regard will be helpful for us.
>          >
>          > with regards,
>          >
>          > --
>          > Dr. Shamik Chakrabarti
>          > Project Employee
>          > Dept. of Metallurgical and Materials Engineering
>          > IIT Kharagpur
>          > Kharagpur-721302
>          > INDIA
>          >
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> 
>         -- 
>         --------------------------------------------------------------------------
>         Peter BLAHA, Inst.f. Materials Chemistry, TU Vienna, A-1060 Vienna
>         Phone: +43-1-58801-165300             FAX: +43-1-58801-165982
>         Email: blaha at theochem.tuwien.ac.at
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> 
> 
>     -- 
>     Dr. Shamik Chakrabarti
>     Project Employee
>     Dept. of Metallurgical and Materials Engineering
>     IIT Kharagpur
>     Kharagpur-721302
>     INDIA
> 
> 
> 
> -- 
> Dr. Shamik Chakrabarti
> Project Employee
> Dept. of Metallurgical and Materials Engineering
> IIT Kharagpur
> Kharagpur-721302
> INDIA
> 
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> Wien mailing list
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> SEARCH the MAILING-LIST at:  http://www.mail-archive.com/wien@zeus.theochem.tuwien.ac.at/index.html
> 

-- 
--------------------------------------------------------------------------
Peter BLAHA, Inst.f. Materials Chemistry, TU Vienna, A-1060 Vienna
Phone: +43-1-58801-165300             FAX: +43-1-58801-165982
Email: blaha at theochem.tuwien.ac.at    WIEN2k: http://www.wien2k.at
WWW: 
http://www.imc.tuwien.ac.at/tc_blaha-------------------------------------------------------------------------