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Adjusts allowable thread count for vp9 decoders.

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Set 2 thread as target for 1280x720 pixel count, and then scale up
linearly from there - but cap at physical core count.
For common resolutions this results in:
1 for 360p
2 for 720p
4 for 1080p
8 for 1440p
18 for 4K

Bug: webrtc:11551
Change-Id: I666bd971eccddee096749f20d3b08eb40fe868ad
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/177012
Reviewed-by: Johannes Kron <kron@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#31513}
This commit is contained in:
Erik Språng
2020-06-12 12:20:42 +02:00
parent 222fdfdace
commit 26e5046951
1 changed files with 9 additions and 3 deletions
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12
modules/video_coding/codecs/vp9/vp9_impl.cc
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@ -1671,10 +1671,16 @@ int VP9DecoderImpl::InitDecode(const VideoCodec* inst, int number_of_cores) {
// We want to use multithreading when decoding high resolution videos. But not // We want to use multithreading when decoding high resolution videos. But not
// too many in order to avoid overhead when many stream are decoded // too many in order to avoid overhead when many stream are decoded
// concurrently. // concurrently.
// Set 1280x720 pixel count as target for one core, and then scale up linearly // Set 2 thread as target for 1280x720 pixel count, and then scale up linearly
// from there - but cap at physical core count. // from there - but cap at physical core count.
// This results in 2 for 1080p, 4 for 1440p and 8 for 4K. // For common resolutions this results in:
int num_threads = std::max(1, (inst->width * inst->height) / (1280 * 720)); // 1 for 360p
// 2 for 720p
// 4 for 1080p
// 8 for 1440p
// 18 for 4K
int num_threads =
std::max(1, 2 * (inst->width * inst->height) / (1280 * 720));
cfg.threads = std::min(number_of_cores, num_threads); cfg.threads = std::min(number_of_cores, num_threads);
#endif #endif
current_codec_ = *inst; current_codec_ = *inst;