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Stephen Fuld <SFuld@alumni.cmu.edu.invalid> schrieb:
[Arrhenius]
Good, I get that. But Thomas' original discussion of the problem
indicated that it was very parallel, so the question is, in your
design, how many of those calculations can go in in parallel?
I ran a little Arrhenius benchmark on an i7-11700. Main program was
program main
implicit none
integer, parameter :: n = 1024
double precision, dimension(n) :: k, a, ea, t
integer :: i
call random_number (a)
call random_number(ea)
ea = 10000+ea*30000
call random_number(t)
t = 400 + 200*t
do i=1,1024*1024
call arrhenius(k,a,ea,t,n)
end do
end program main
and the called routine was (in a separate file, so the compiler
could not notice that the results were actually never used)
subroutine arrhenius(k, a, ea, t, n)
implicit none
integer, intent(in) :: n
double precision, dimension(n), intent(out) :: k
double precision, dimension(n), intent(in) :: a, ea, t
double precision, parameter :: r = 8.314
k = a * exp(-ea/(r*t))
end subroutine arrhenius
Timing result (wall-clock time only):
-O0: 5.343s
-O2: 4.560s
-Ofast: 2.237s
-Ofast -march=native -mtune=native: 2.154
Of course, you kever know what speed your CPU is actually running
at these days, but if I assume 5GHz, that would give around 10
cycles per Arrhenius evaluation, which is quite fast (IMHO).
It uses an AVX2 version of exp, or so I gather from the function
name, _ZGVdN4v_exp_avx2 .
Date | Sujet | # | Auteur | |
13 Jul 24 | Continuations | 138 | Lawrence D'Oliveiro | |
13 Jul 24 | Re: Continuations | 4 | BGB | |
14 Jul 24 | Re: Continuations | 2 | aph | |
15 Jul 24 | Re: Continuations | 1 | Lawrence D'Oliveiro | |
14 Jul 24 | Re: Continuations | 1 | Anton Ertl | |
13 Jul 24 | Re: Continuations | 23 | John Dallman | |
14 Jul 24 | Re: Continuations | 21 | Lawrence D'Oliveiro | |
14 Jul 24 | Re: Continuations | 20 | George Neuner | |
14 Jul 24 | Re: Continuations | 19 | John Levine | |
14 Jul 24 | Re: Continuations | 18 | Niklas Holsti | |
15 Jul 24 | Re: Continuations | 16 | John Levine | |
15 Jul 24 | Re: Continuations | 1 | Terje Mathisen | |
15 Jul 24 | Re: Continuations | 1 | John Levine | |
15 Jul 24 | Re: Continuations | 9 | Niklas Holsti | |
16 Jul 24 | Re: Continuations | 8 | Lawrence D'Oliveiro | |
16 Jul 24 | Re: Continuations | 7 | John Levine | |
16 Jul 24 | Re: Continuations | 1 | Chris M. Thomasson | |
16 Jul 24 | Re: Continuations | 5 | Lawrence D'Oliveiro | |
16 Jul 24 | Re: Continuations | 4 | John Levine | |
16 Jul 24 | Re: Continuations | 3 | Lawrence D'Oliveiro | |
16 Jul 24 | Re: Continuations | 2 | MitchAlsup1 | |
17 Jul 24 | Re: Continuations | 1 | Lawrence D'Oliveiro | |
16 Jul 24 | Re: Continuations | 3 | Lawrence D'Oliveiro | |
16 Jul 24 | Re: Continuations | 2 | MitchAlsup1 | |
16 Jul 24 | Re: Continuations | 1 | Lawrence D'Oliveiro | |
16 Jul 24 | Re: Continuations | 1 | MitchAlsup1 | |
16 Jul 24 | Re: Continuations | 1 | Lawrence D'Oliveiro | |
14 Jul 24 | Re: Continuations | 1 | BGB | |
13 Jul 24 | Re: Continuations | 1 | BGB | |
14 Jul 24 | Re: Continuations | 10 | Lawrence D'Oliveiro | |
15 Jul 24 | Re: Continuations | 7 | Thomas Koenig | |
15 Jul 24 | Re: Continuations | 6 | Thomas Koenig | |
16 Jul 24 | Re: Continuations | 4 | Thomas Koenig | |
16 Jul 24 | Re: Continuations | 2 | MitchAlsup1 | |
17 Jul 24 | Re: Continuations | 1 | Lawrence D'Oliveiro | |
17 Jul 24 | Re: Continuations | 1 | Lawrence D'Oliveiro | |
17 Jul 24 | Re: Continuations | 1 | John Dallman | |
16 Jul 24 | Re: Continuations | 1 | Lawrence D'Oliveiro | |
16 Jul 24 | Re: Continuations | 1 | John Levine | |
14 Jul 24 | Re: Continuations | 1 | George Neuner | |
14 Jul 24 | Re: Continuations | 92 | John Savard | |
14 Jul 24 | Re: Continuations | 1 | BGB | |
15 Jul 24 | Re: Continuations | 90 | Lawrence D'Oliveiro | |
16 Jul 24 | Re: Continuations | 89 | John Savard | |
16 Jul 24 | Re: Continuations | 2 | MitchAlsup1 | |
17 Jul 24 | Re: Continuations | 1 | Lawrence D'Oliveiro | |
16 Jul 24 | Re: Continuations | 86 | MitchAlsup1 | |
17 Jul 24 | Re: Continuations | 69 | John Savard | |
17 Jul 24 | Re: Continuations | 68 | MitchAlsup1 | |
17 Jul 24 | Re: Continuations | 67 | Thomas Koenig | |
17 Jul 24 | Re: Continuations | 1 | Thomas Koenig | |
17 Jul 24 | Re: Continuations | 1 | Michael S | |
17 Jul 24 | Re: Continuations | 37 | MitchAlsup1 | |
17 Jul 24 | Re: Continuations | 36 | Stephen Fuld | |
17 Jul 24 | Re: Continuations | 35 | MitchAlsup1 | |
17 Jul 24 | Re: Continuations | 22 | Stephen Fuld | |
18 Jul 24 | Re: Continuations | 8 | MitchAlsup1 | |
18 Jul 24 | Re: Continuations | 1 | Michael S | |
18 Jul 24 | Re: Continuations | 6 | MitchAlsup1 | |
19 Jul 24 | Re: Continuations | 1 | Stephen Fuld | |
21 Jul 24 | Re: Reservation stations [was Continuations] | 2 | Anton Ertl | |
21 Jul 24 | Re: Reservation stations [was Continuations] | 1 | MitchAlsup1 | |
21 Jul 24 | Re: Reservation stations [was Continuations] | 2 | MitchAlsup1 | |
22 Jul 24 | IPC (was: Reservation stations) | 1 | Anton Ertl | |
18 Jul 24 | Re: Continuations | 11 | Thomas Koenig | |
18 Jul 24 | Re: Continuations | 10 | Michael S | |
18 Jul 24 | Re: Continuations | 9 | Thomas Koenig | |
18 Jul 24 | Re: Continuations | 8 | Michael S | |
18 Jul 24 | Re: Continuations | 6 | Thomas Koenig | |
18 Jul 24 | Re: Continuations | 1 | Michael S | |
18 Jul 24 | Re: Continuations | 4 | Michael S | |
19 Jul 24 | Re: Continuations | 3 | Thomas Koenig | |
19 Jul 24 | Re: Continuations | 2 | Michael S | |
20 Jul 24 | Re: Continuations | 1 | Thomas Koenig | |
18 Jul 24 | Re: Continuations | 1 | MitchAlsup1 | |
18 Jul 24 | Re: Continuations | 2 | John Savard | |
18 Jul 24 | Re: Continuations | 1 | Thomas Koenig | |
18 Jul 24 | Re: Continuations | 6 | Thomas Koenig | |
18 Jul 24 | Re: Continuations | 5 | Michael S | |
18 Jul 24 | Re: Continuations | 4 | Michael S | |
18 Jul 24 | Re: Continuations | 3 | Thomas Koenig | |
18 Jul 24 | Re: Continuations | 2 | MitchAlsup1 | |
20 Jul 24 | Re: Continuations | 1 | Thomas Koenig | |
18 Jul 24 | Non-pipelined FDIV/SQRT (was: Continuations) | 3 | Stefan Monnier | |
18 Jul 24 | Re: Non-pipelined FDIV/SQRT | 1 | MitchAlsup1 | |
28 Jul 24 | Re: Non-pipelined FDIV/SQRT | 1 | Michael S | |
18 Jul 24 | Re: Continuations | 3 | MitchAlsup1 | |
28 Jul 24 | Re: Continuations | 2 | Paul A. Clayton | |
28 Jul 24 | Re: Continuations | 1 | Michael S | |
19 Jul 24 | Re: Continuations | 27 | Terje Mathisen | |
19 Jul 24 | Re: Continuations | 5 | Thomas Koenig | |
19 Jul 24 | Re: Continuations | 1 | Chris M. Thomasson | |
19 Jul 24 | Re: Continuations | 3 | MitchAlsup1 | |
20 Jul 24 | Re: Continuations | 1 | Terje Mathisen | |
20 Jul 24 | Re: Continuations | 1 | Thomas Koenig | |
19 Jul 24 | Re: Continuations | 21 | MitchAlsup1 | |
19 Jul 24 | Re: Continuations | 8 | Terje Mathisen | |
22 Jul 24 | Re: Continuations | 7 | Michael S | |
22 Jul 24 | Re: Continuations | 3 | MitchAlsup1 | |
22 Jul 24 | Re: Continuations | 2 | Michael S | |
23 Jul 24 | Re: Continuations | 1 | MitchAlsup1 | |
23 Jul 24 | Re: Continuations | 3 | Terje Mathisen | |
19 Jul 24 | Faster div or 1/sqrt approximations (was: Continuations) | 12 | Thomas Koenig | |
17 Jul 24 | Re: Continuations | 3 | Lawrence D'Oliveiro | |
17 Jul 24 | Re: Continuations | 12 | Stephen Fuld | |
17 Jul 24 | Re: fancy instructions, Continuations | 1 | John Levine | |
15 Jul 24 | Re: Continuations | 1 | wolfgang kern | |
15 Jul 24 | Re: pessimal storage allocation, Continuations | 3 | John Levine | |
15 Jul 24 | Re: Continuations | 1 | MitchAlsup1 | |
16 Jul 24 | Re: Continuations | 1 | Lynn Wheeler |
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