8000 Added a simple benchmarking suite. Run with 'make benchmark' · JavaScriptIOT/dsp.js@e361d92 · GitHub
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Added a simple benchmarking suite. Run with 'make benchmark'
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‎Makefile

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# Make sure $JSSHELL points to your js shell binary in .profile or .bashrc
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# Most targets use commands that need a js shell path specified
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JSSHELL ?= $(error Specify a valid path to a js shell binary in ~/.profile: export JSSHELL=C:\path\js.exe or /path/js)
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# Version number used in naming release files.
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VERSION ?= $(error Specify a version for your release (e.g., VERSION=0.5))
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FREQUENCY ?= 440
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benchmark:
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${JSSHELL} -j -e 'var FREQUENCY=${FREQUENCY};' -f dsp.js -f ./bench/bench.js -f ./bench/dft.js
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${JSSHELL} -j -e 'var FREQUENCY=${FREQUENCY};' -f dsp.js -f ./bench/bench.js -f ./bench/fft.js
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${JSSHELL} -j -e 'var FREQUENCY=${FREQUENCY};' -f dsp.js -f ./bench/bench.js -f ./bench/rfft.js
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clean:
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rm -fr ./release

‎bench/bench.js

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function benchmark(func, loopCount) {
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loopCount = loopCount || 10000;
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var start = Date.now();
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for (var i = 0; i < loopCount; i++) {
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func();
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}
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var end = Date.now();
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return end - start;
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}

‎bench/dft.js

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var bufferSize = 2048;
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var sampleRate = 44100;
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var frequency = FREQUENCY || 440;
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var dft = new DFT(bufferSize, sampleRate);
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var osc = new Oscillator(DSP.SAW, frequency, 1.0, bufferSize, sampleRate);
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var signal = osc.generate();
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var duration = benchmark(function() { dft.forward(signal); }, 20);
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var peakBand = 0;
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for (var i = 0; i < dft.spectrum.length; i++) {
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peakBand = (dft.spectrum[i] > dft.spectrum[peakBand]) ? i : peakBand;
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}
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var peakFreq = dft.getBandFrequency(dft.peakBand);
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print("Detected peak: " + peakFreq + " Hz (error " + Math.abs(peakFreq - frequency) + " Hz)");
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print("20 DFTs: " + (duration) + " ms (" + ((duration) / 20) + "ms per DFT)\n");

‎bench/fft.js

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var bufferSize = 2048;
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var sampleRate = 44100;
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var frequency = FREQUENCY || 440;
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var fft = new FFT(bufferSize, sampleRate);
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var osc = new Oscillator(DSP.SAW, frequency, 1.0, bufferSize, sampleRate);
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var signal = osc.generate();
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var duration = benchmark(function() { fft.forward(signal); });
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var peakBand = 0;
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for (var i = 0; i < fft.spectrum.length; i++) {
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peakBand = (fft.spectrum[i] > fft.spectrum[peakBand]) ? i : peakBand;
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}
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var peakFreq = fft.getBandFrequency(fft.peakBand);
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print("Detected peak: " + peakFreq + " Hz (error " + Math.abs(peakFreq - frequency) + " Hz)");
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print("10000 FFTs: " + (duration) + " ms (" + ((duration) / 10000) + "ms per FFT)\n");

‎bench/rfft.js

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var bufferSize = 2048;
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var sampleRate = 44100;
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var frequency = FREQUENCY || 440;
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var fft = new RFFT(bufferSize, sampleRate);
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var osc = new Oscillator(DSP.SAW, frequency, 1.0, bufferSize, sampleRate);
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var signal = osc.generate();
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var duration = benchmark(function() { fft.forward(signal); });
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var peakBand = 0;
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for (var i = 0; i < fft.spectrum.length; i++) {
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peakBand = (fft.spectrum[i] > fft.spectrum[peakBand]) ? i : peakBand;
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}
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var peakFreq = fft.getBandFrequency(fft.peakBand);
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print("Detected peak: " + peakFreq + " Hz (error " + Math.abs(peakFreq - frequency) + " Hz)");
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print("10000 FFTs: " + (duration) + " ms (" + ((duration) / 10000) + "ms per FFT)\n");

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