Thanks John, this seems very clear.
Oeyvind

2008/7/30, jpff <jpff@codemist.co.uk>:
> I will try to explain the measurements and the purposes to which they
> could be put.
>
> In order that an opcode OP is to be played for T seconds it will need
> to be initialised (i-rate) and then it is performed.  The performance
> function will be called T*kr times.  Each of these calls has a fixed
> cost and a cost that is proportional to ksmps.
>
> So the cost of OP for T secs is
>   A + T*kr*(B*ksmps + C)
>
> As ksmps*kr is sr you can view this as
>
>   A + T*sr*B + T*kr*C
>
> A is immutable, B is the cost per sample and C is the cost of using a
> kontrol rate.
>
> The measurements were done on an i386 using valgrind and similar
> tools, using Trapped and Hans Mikelson's Teknobubble.  Clearly the
> figures average the effect of different parameters, and there are some
> oddities that suggest that the tools need a little tweak,
>
> So uses: for rt performance it tells you the value of the kr reduction
> against quality.  When there are more opcodes measured it should inform
> the choice of detailed methods.
>
> For parallelism it is essential that the granularity of the tasks is
> considered, and over the years I have played with parallelism I have
> seems significant slowdowns as the small granularity messes up the
> overhead cost of task switch or distribution.
>
> I hope this clarifies things a little.  I am afraid that at heart I am
> a mathematician so formulae are clearer than words in these cases.
> Happy to answer questions take requests for particular opcodes to be
> measured or whatever improves csound.
>
> Below is my current data set
> ==John ffitch
> ------------------------------------------------------------------------
>                A       B       C       (missing values are zero)
> !=.i:           13
> !=.k:           0       0       13
> *.ak:           0       6       15
> *.ka:           0       6       15
> *.kk:           0       0       9
> +.aa:           0       6       16
> +.kk:            0      0       9
> /.ak:           0       6       20
> /.kk:           0       0       9
> =.i             7
> =.k:            0       0       7
> =.a:            0        1      15
> -.kk:           0       0        9
> grain:          497     917.921440 79475.154651
> arand:          52      -0.351226       188.512264
> balance:        38      2.351111        274.488889
> butterbp:       20       30     71
> butterhi:       19       30.000387 35
> butterlp:       19       29.005359 45.478359
> buzz:           75      -0.639775       430.385596
> cpspch:         106.368056
> delay:          4097    -0.340018       157.403009
> exp.i:          19.412868
> exp.k:          0       0       19.412868
> expon.k:        178.553846      0        9
> expseg.a:       669.121622     5.000011 37
> expseg.k:       669.121622     0.000031 26
> foscil:         81      29       72
> frac.i:         65
> gbuzz:          77      64.000105 125.499682
> init:           0       4       12
> int.i:          67
> integrate:      13      5       17
> kcgoto:         0      0.000022 8.758767
> kgoto:          0       0       7
> line.k:         20             0.000762 8.992379
> linen.k:        62             0.000004 20.650515
> linseg.k:       266.971564     0.000559 29.994448
> nlfilt:         1068.813496     52.985889 100.158886
> octpch.i:       74
> oscil.ka:       69      17       46
> oscil.kk:       69      0        41
> oscil.kk:       69      12       47
> oscili.kk:      69      21       49
> outs:           0       9.563279 21.655083
> phasor.a:       38      15.979998 32.000007
> phasor.k:       38      -0.000798 27
> randh.k:        60      0.058034 34.004509
> randi.k:        76      0.015561 35.999951
> =.r:            2
> reinit:         0       0       16335.400000
> reson:          39      13.002546 99.545002
> reverb:         6963.481481       77.038957 157.999993
> rms:            32      10      21
> sqrt.i:         8
> sqrt.k:         0       0       8
> table.a:        93      23.062626 43.997796
> table.k:        93      0        45
> tablei.k:       93      0        61
> timout:         40     -0.002915 15.235836
> upsamp:         0       4        12
> vdelay:         2073.886076     53.572573 69.049966
> zacl:           14      51      54
> zar:            14       1      41
> zaw:            14      1.000018 38.998197
> zkcl:           14      0       101
> zkr:            14      0       32
> zkw:            14      0       31.999964
> **end**
>
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