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Some further notes (and experiments) on optimizations

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This commit is contained in:
Robin Gareus 2017-11-06 00:12:32 +01:00
parent da4cea0526
commit 4cdd3f5df6
1 changed files with 9 additions and 4 deletions
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13
libs/ardour/port_manager.cc
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@ -755,7 +755,7 @@ PortManager::cycle_start (pframes_t nframes, Session* s)
/* TODO optimize
* - when speed == 1.0, the resampler copies data without processing
* it may be more efficient to just run all in sequence
* it may (or may not) be more efficient to just run all in sequence.
*
* - single sequential task for 'lightweight' tasks would make sense
* (run it in parallel with 'heavy' resampling.
@ -766,8 +766,13 @@ PortManager::cycle_start (pframes_t nframes, Session* s)
* amount of work (how many connected ports are there, how
* many resamplers need to run) vs. available CPU cores and semaphore
* synchronization overhead.
*
* - input ports: it would make sense to resample each input only once
* (rather than resample into each ardour-owned input port).
* A single external source-port may be connected to many ardour
* input-ports. Currently re-sampling is per input.
*/
if (s && s->rt_tasklist () /* && fabs (Port::speed_ratio ()) != 1.0 */) {
if (s && s->rt_tasklist () && fabs (Port::speed_ratio ()) != 1.0) {
RTTaskList::TaskList tl;
for (Ports::iterator p = _cycle_ports->begin(); p != _cycle_ports->end(); ++p) {
tl.push_back (boost::bind (&Port::cycle_start, p->second, nframes));
@ -784,7 +789,7 @@ void
PortManager::cycle_end (pframes_t nframes, Session* s)
{
// see optimzation note in ::cycle_start()
if (s && s->rt_tasklist () /* && fabs (Port::speed_ratio ()) != 1.0 */) {
if (s && s->rt_tasklist () && fabs (Port::speed_ratio ()) != 1.0) {
RTTaskList::TaskList tl;
for (Ports::iterator p = _cycle_ports->begin(); p != _cycle_ports->end(); ++p) {
tl.push_back (boost::bind (&Port::cycle_end, p->second, nframes));
@ -887,7 +892,7 @@ void
PortManager::cycle_end_fade_out (gain_t base_gain, gain_t gain_step, pframes_t nframes, Session* s)
{
// see optimzation note in ::cycle_start()
if (s && s->rt_tasklist () /* && fabs (Port::speed_ratio ()) != 1.0 */) {
if (s && s->rt_tasklist () && fabs (Port::speed_ratio ()) != 1.0) {
RTTaskList::TaskList tl;
for (Ports::iterator p = _cycle_ports->begin(); p != _cycle_ports->end(); ++p) {
tl.push_back (boost::bind (&Port::cycle_end, p->second, nframes));