Hi All,

I ran the attached CSD with csound using the normal non-threaded kperf
and also with --num-threads=2.  The results of the run are listed at
end of email.  The CSD's are simple but they use the moogladder opcode
which is pretty heavy CPU-wise.  I ran it twice with both setups on
WinXP using latest from CVS and got pretty much the same results both
times.  The elapsed time at end of runs is below:

Elapsed time at end of performance: real: 5.243s, CPU: 5.250s  (using
normal kperf)
Elapsed time at end of performance: real: 3.776s, CPU: 3.781s  (--num-threads=2)

This makes me hopeful that even with multithreading as-is, there is
some benefit.  I did try with adding

mutex_lock 0
outs aout, aout
mutex_unlock 0

and it seemed to bump up the performance time with --num-threads=2 to
about 4.05 seconds on average, but still an improvement.

Just wanted to report some findings and that I think we should take a
similar approach to creating a test suite like the one that was built
for the new compiler, which is to build simple CSD's and slowly add a
feature to each new test CSD (i.e. next add if-goto's).

Thanks,
steven


$ csound threadtest.csd -o test.wav
time resolution is 279.365 ns
virtual_keyboard real time MIDI plugin for Csound
0dBFS level = 32768.0
Csound version 5.08.91 beta (double samples) Jun 28 2008
libsndfile-1.0.17
Reading options from $HOME/.csoundrc
UnifiedCSD:  threadtest.csd
STARTING FILE
Creating orchestra
Creating score
orchname:  C:/DOCUME~1/syi/LOCALS~1/Temp\cs376.orc
scorename: C:/DOCUME~1/syi/LOCALS~1/Temp\cs377.sco
rtaudio: WinMM module enabled
orch compiler:
14 lines read
        instr   1
Elapsed time at end of orchestra compile: real: 0.078s, CPU: 0.078s
sorting score ...
        ... done
Elapsed time at end of score sort: real: 0.080s, CPU: 0.078s
Csound version 5.08.91 beta (double samples) Jun 28 2008
displays suppressed
0dBFS level = 32768.0
orch now loaded
audio buffered in 4096 sample-frame blocks
writing 16384-byte blks of shorts to test.wav (WAV)
SECTION 1:
new alloc for instr 1:
new alloc for instr 1:
new alloc for instr 1:
new alloc for instr 1:
new alloc for instr 1:
new alloc for instr 1:
new alloc for instr 1:
B  0.000 .. 10.000 T 10.000 TT 10.000 M:  29397.7  29397.7
Score finished in csoundPerform().
inactive allocs returned to freespace
end of score.              overall amps:  29397.7  29397.7
           overall samples out of range:        0        0
0 errors in performance
Elapsed time at end of performance: real: 5.243s, CPU: 5.250s
118 16384-byte soundblks of shorts written to test.wav (WAV)
Removing temporary file C:/DOCUME~1/syi/LOCALS~1/Temp\cs378.srt ...
Removing temporary file C:/DOCUME~1/syi/LOCALS~1/Temp\cs377.sco ...
Removing temporary file C:/DOCUME~1/syi/LOCALS~1/Temp\cs376.orc ...


$ csound threadtest.csd -o test.wav --num-threads=2
time resolution is 279.365 ns
virtual_keyboard real time MIDI plugin for Csound
0dBFS level = 32768.0
Csound version 5.08.91 beta (double samples) Jun 28 2008
libsndfile-1.0.17
Reading options from $HOME/.csoundrc
UnifiedCSD:  threadtest.csd
STARTING FILE
Creating orchestra
Creating score
orchname:  C:/DOCUME~1/syi/LOCALS~1/Temp\cs376.orc
scorename: C:/DOCUME~1/syi/LOCALS~1/Temp\cs377.sco
rtaudio: WinMM module enabled
orch compiler:
14 lines read
        instr   1
Elapsed time at end of orchestra compile: real: 0.080s, CPU: 0.078s
sorting score ...
        ... done
Elapsed time at end of score sort: real: 0.082s, CPU: 0.078s
Csound version 5.08.91 beta (double samples) Jun 28 2008
displays suppressed
0dBFS level = 32768.0
orch now loaded
audio buffered in 4096 sample-frame blocks
Multithread performance: insno:  -1  thread 1 of 2 starting.
writing 16384-byte blks of shorts to test.wav (WAV)
SECTION 1:
new alloc for instr 1:
Multithread performance: insno:  -1  thread 0 of 2 starting.
new alloc for instr 1:
new alloc for instr 1:
new alloc for instr 1:
new alloc for instr 1:
new alloc for instr 1:
new alloc for instr 1:
B  0.000 .. 10.000 T 10.000 TT 10.000 M:  29397.7  29397.7
Score finished in csoundPerform().
inactive allocs returned to freespace
end of score.              overall amps:  29397.7  29397.7
           overall samples out of range:        0        0
0 errors in performance
Elapsed time at end of performance: real: 3.776s, CPU: 3.781s
118 16384-byte soundblks of shorts written to test.wav (WAV)
Removing temporary file C:/DOCUME~1/syi/LOCALS~1/Temp\cs378.srt ...
Removing temporary file C:/DOCUME~1/syi/LOCALS~1/Temp\cs377.sco ...
Removing temporary file C:/DOCUME~1/syi/LOCALS~1/Temp\cs376.orc ...