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[WIP] Implements reusable sample buffers across all components. This

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produces a significant reduction in memory usage, especially for tuners
like the airspy and hackrf that produce 10/20 MSPS sample rates.  This
is observed to be around 66% reduction in peak memory usage and provides
a more stable memory utilization across time reducing stress on the
garbage collector.

Use of these reusable memory buffers will be pushed further down into
the processing chain modules to ensure we keep new object creation
to the lowest levels possible.
This commit is contained in:
Denny
2018-02-03 10:05:16 -05:00
parent fcd3c2fd46
commit f2f2c92afe
56 changed files with 1630 additions and 1255 deletions
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15
src/main/java/io/github/dsheirer/spectrum/DFTProcessor.java
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@@ -20,7 +20,7 @@ import io.github.dsheirer.dsp.filter.Window.WindowType;
import io.github.dsheirer.properties.SystemProperties;
import io.github.dsheirer.sample.Listener;
import io.github.dsheirer.sample.SampleType;
import io.github.dsheirer.sample.complex.ComplexBuffer;
import io.github.dsheirer.sample.complex.reusable.ReusableComplexBuffer;
import io.github.dsheirer.sample.real.IOverflowListener;
import io.github.dsheirer.source.ISourceEventProcessor;
import io.github.dsheirer.source.SourceEvent;
@@ -41,7 +41,7 @@ import java.util.concurrent.atomic.AtomicBoolean;
* Processes both complex samples or float samples and dispatches a float array of DFT results, using configurable fft
* size and output dispatch timelines.
*/
public class DFTProcessor implements Listener<ComplexBuffer>, ISourceEventProcessor, IDFTWidthChangeProcessor
public class DFTProcessor implements Listener<ReusableComplexBuffer>, ISourceEventProcessor, IDFTWidthChangeProcessor
{
private static final Logger mLog = LoggerFactory.getLogger(DFTProcessor.class);
private static final int BUFFER_QUEUE_MAX_SIZE = 12;
@@ -192,13 +192,18 @@ public class DFTProcessor implements Listener<ComplexBuffer>, ISourceEventProces
* Places the sample into a transfer queue for future processing.
*/
@Override
public void receive(ComplexBuffer sampleBuffer)
public void receive(ReusableComplexBuffer sampleBuffer)
{
mOverflowableBufferStream.offer(sampleBuffer);
}
private void calculate()
{
//We always send the previous calculated samples - this should improve the screen rendering since the frame
//rate will always occur on an even rhythm. Any delays caused by processing will be absorbed and not impact
//the screen rendering.
dispatch(mPreviousSamples);
try
{
if(mFrameFlushCount > 0)
@@ -220,14 +225,12 @@ public class DFTProcessor implements Listener<ComplexBuffer>, ISourceEventProces
mFFT.complexForward(samples);
}
dispatch(samples);
mPreviousSamples = samples;
}
catch(IOException ioe)
{
//No new data, dispatch the previous samples again
dispatch(mPreviousSamples);
//no-op
}
}