[Gretl-devel] Re: mols() and multithreading

Am 22.01.2020 um 22:44 schrieb Allin Cottrell: > On Wed, 22 Jan 2020, Sven S wrote: > >> Am 22.01.20 um 14:47 schrieb Marcin Błażejowski: >>> my machine is: 4 Hyper-Threaded Core i7-8550U CPU @ 1.80GHz. >>> >>> My results: >>> >>> OMP...            OPENBLAS...       best of 3 runs >>> <unset/default>   <unset/default>   7.54 >>> 4                 4                 7.24 >>> 4                 1                 8.36 >>> 1                 4                 12.66 >>> 1                 1                 12.51 >> >> Thanks Marcin, that's interesting! Actually I have the same CPU in a >> laptop, so I could cross-check how the Windows package influences the >> whole thing. So with that same i7-8550U I get on Windows 10 (only OMP varying): 8: 5.<something> 4: 4.1 1: 1.8 It hasn't been clear to me whether in the end you had Openblas or Netlib effectively being active. But apart from that the single-threaded performance here might suggest that the CPU's Turboboost isn't supported by the Linux drivers on your system? For the single thread the CPU goes up all the way to 3.9GHz -- of course in some sense it's comparing apples to oranges, but OTOH that's the reality of the hardware the stuff is running on...