Reduce allocations to improve performance. #3868
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Allocating all six oscillators separately is inefficient. It is much more efficient to allocate all of them as a single block.
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Allocating all six oscillators separately is inefficient. It is much more efficient to allocate all of them as a single block.
Allocating each oscillator separately was degrading performance when using the Organic instrument.
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The Organic instrument has the same issue with excessive allocations as the TripleOsc instrument did. I'm adding it to this pull request with the same changes. |
| oscs_r[i + 1] ); | ||
| new (&oscs_l[i]) Oscillator( | ||
| &m_osc[i]->m_waveShapeModel, | ||
| &m_osc[i]->m_modulationAlgoModel, |
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You have unnecessary indentation here
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@softrabbit or @gi0e5b06 (or someone else) can you please review this? |
lukas-w
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I left a couple of suggestions. Generally speaking, this PR adds yet another quirky, slightly obscure way of manual memory management, but I can't think of a better way to do this, so I'd still say we should merge this.
I'd suggest leaving some comments explaining what's done here, at least in deleteNotePluginData. It's not obvious that delete oscLeft deletes the right oscillators too.
| class EXPORT Oscillator | ||
| { | ||
| MM_OPERATORS | ||
| void* operator new( std::size_t, void* p ) |
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Why is this override needed? Isn't this the default implementation?
| { | ||
| Oscillator * oscs_l[m_numOscillators]; | ||
| Oscillator * oscs_r[m_numOscillators]; | ||
| Oscillator * oscs_all = MM_ALLOC( Oscillator, m_numOscillators*2 ); |
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Seeing that Oscillator has overloaded new operators through the MM_OPERATORS macro, we should be able to replace this with
Oscillator* oscs_all = new Oscillator[m_numOscillators * 2]| Oscillator * oscs_r[m_numOscillators]; | ||
| Oscillator * oscs_all = MM_ALLOC( Oscillator, m_numOscillators*2 ); | ||
| Oscillator * oscs_l = oscs_all; | ||
| Oscillator * oscs_r = oscs_all + m_numOscillators; |
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Maybe this alternative is clearer to readers, but I'll leave it up to you
Oscillator * oscs_l = & oscs_all[0];
Oscillator * oscs_r = & oscs_all[m_numOscillators];| static_cast<oscPtr *>( _n->m_pluginData )->oscLeft = oscs_l[0]; | ||
| static_cast<oscPtr *>( _n->m_pluginData )->oscRight = oscs_r[0]; | ||
| static_cast<oscPtr *>( _n->m_pluginData )->oscLeft = &oscs_l[0]; | ||
| static_cast<oscPtr *>( _n->m_pluginData )->oscRight = &oscs_r[0]; |
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&oscs_l[0] and &oscs_r[0] can be written as oscs_l and oscs_r respectively.
| delete static_cast<Oscillator *>( static_cast<oscPtr *>( | ||
| _n->m_pluginData )->oscRight ); | ||
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| MM_FREE( static_cast<oscPtr *>(_n->m_pluginData )->oscLeft); |
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In analogy to the allocation, this should be written as
delete[] static_cast<oscPtr *>(_n->m_pluginData )->oscLeftUsing MM_FREE won't call the object's destructors.
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| void TripleOscillator::playNote( NotePlayHandle * _n, | ||
| sampleFrame * _working_buffer ) | ||
| { |
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Same comments apply to TripleOscillator.cpp.
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Closing as there's been no reaction to the review and #3873 already mitigates these performance issues greatly. |
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This commit partially addresses the poor performance while playing the Skiessi-RandomProjectNumber demo song. This is basically only an issue because of issue #3865, but decreasing the number of allocations is probably good regardless of allocator performance.