[Pw_forum] Question about slow speed of version 4.1.3

[Gabriele Sclauzero]

It may be that in order to link to the new version of MKL the -openmp  
flag has been added to the LDFLAGS variable (see make.sys) . If you  
are running on a multicore or HT system, the OS may select  
automatically a number of threads greater than one and this is not  
efficient in your case perhaps. To see if this is the case you should  
monitor the number of running pw.x threads (these are usually hidden  
in the process list from the top command, you should press H in order  
to visualize all threads), or set
export OMP_NUM_THREADS=1
and rerun the job.

HTH

GS

Il giorno 07/mag/10, alle ore 19:42, saqib.javaid at ipcms.u-strasbg.fr  
ha scritto:

> Dear PWSCF users,
>
> I have a question regarding newer PWSCF version 4.1.3. I have been  
> using 4.0.3
> version for a while. I have recently complied 4.1.3 (which is done
> successfully) but surprised to see that it is a lot slower than 4.0.3.
> Installation has been done in the same envirement. I have been using
> Intell-cc-10, intell_fc_10, mkl10 and openmpi
> Apparently i am stuck somewhere in compatability. I would appreciate  
> if you
> could help me solve this problem
> with best regards
> saqib javaid
> University of strasbourg
>
>
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§ Gabriele Sclauzero, EPFL SB ITP CSEA
    PH H2 462, Station 3, CH-1015 Lausanne

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