Here is the orchestra for the test

sr     = 44100
ksmps  = 1
nchnls = 1

instr 1
endin


and there are 20000 events in the score with

  at = dur = 0.001

i1 0 0.001
i1 + .
...

The total dur is 20 seconds. The shell script to generate it is

  seq 0 0.001 20 | xargs -i echo i1 {} 0.001 > test.sco

# current csound
csound test.orc test.sco
...
Elapsed time at end of performance: real: 8.045s, CPU: 7.950s
...


# csound 5.14.2
csound test.orc test.sco
...
Elapsed time at end of performance: real: 0.506s, CPU: 0.340s
...


# current scsort
time scsort < test.sco
...
real    0m4.333s
user    0m3.929s
sys     0m0.053s

# scsort with 5.14.2
time scsort < test.sco
...
real    0m0.438s
user    0m0.099s
sys     0m0.063s


I have found a solution for `scsort' modifying the `fltout' function
in Engine/swritestr.c

static void fltout(CSOUND *csound, MYFLT n)
{
    char *c, buffer[1024];
    sprintf(buffer, "%.6f", n);
    for (c = buffer; *c != '\0'; c++)
      corfile_putc(*c, csound->scstr);
}

that is faster than `corfile_puts(buffer, csound->scstr)'.
The new result is

# current scsort + fix
time scsort < test.sco
...
real    0m0.444s
user    0m0.100s
sys     0m0.047s


Yeah, one is gone (not applied, let me know if it is good for you).

However, after the sorting, we still have

csound test.orc test.sco
...
Elapsed time at end of performance: real: 3.830s, CPU: 3.780s
...


Only few informations with `strace'. There is a `select' call
in the csoundInternalYieldCallback (probably from fltk) but
it is not the cause because I have bypassed it. Mystery for now.

You looks at the results if we maintain the number of the events
but with largest durations:

-----  at = dur = 0.01  20001 events  -----

# csound current + scsort fix
...
Elapsed time at end of performance: real: 4.583s, CPU: 4.530s
...

# csound 5.14.2
...
Elapsed time at end of performance: real: 1.324s, CPU: 1.300s
...

-----  at = dur = 0.1   20001 events  -----

# csound current + scsort fix
...
Elapsed time at end of performance: real: 9.686s, CPU: 9.530s
...

# csound 5.14.2
...
Elapsed time at end of performance: real: 9.667s, CPU: 9.590s
...


tito

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