Thanks, Steven. That's a good idea to use intense opcodes, to get the overhead out of the way.

There are issues with number of instances per thread -- see earlier emails. Should be easy to fix.

Best,
Mike

-----Original Message-----
>From: Steven Yi 
>Sent: Jun 29, 2008 12:04 AM
>To: Developer discussions 
>Subject: [Cs-dev] Multithreaded Performance
>
>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 ...




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