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Re: Correct command line -np parameter value

Alex Granovsky
gran@classic.chem.msu.su


Hello,

For Intel CPUs, max values are not about particular CPU but rather
about limitations of CPU's microarchitecture and design. They are
rather useless.

>actual # of   cores/package :   2
>actual # of threads/package :   4
>actual # of threads/core    :   2

In most cases, you would like to run Firefly on this system
using -np 2 option as there are only 2 physical cores.

If you want to use all four logical cores, use -np 4 and edit your
input to add this instruction:


 $smp httfix=.f. $end

Hope this helps.

Kind regards,
Alex Granovsky






On Tue Oct 4 '16 11:29pm, TG3D wrote
------------------------------------
>In a Firefly job header, my system shows up as follows:

>max    # of   cores/package :   8
>max    # of threads/package :  16
>max     cache sharing level :  16
>actual # of   cores/package :   2
>actual # of threads/package :   4
>actual # of threads/core    :   2

>What's the correct value of the -np parameter: 2, 4, 8 or 16?
>

[ This message was edited on Wed Oct 5 '16 at 0:30am by the author ]


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