Victor Boivie b2f8c1675d Use unordered_map in ReceiveStatisticsImpl
In highly loaded media servers, ReceiveStatisticsImpl's use of std::map
attributes to ~0.32% CPU. It needs to be able to iterate through the
statisticians in order when reporting, but that is considered to be rare
compared to how often they are looked up. So this commit adds a separate
sorted set for just keeping track of the SSRCs, and letting the map of
SSRC to Statisticians, be unordered.

Bug: webrtc:12689
Change-Id: I69fe41d96bca31b2e8d669b58b5c7afabceaa6a6
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/216385
Commit-Queue: Victor Boivie <boivie@webrtc.org>
Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#33864}
2021-04-28 13:28:35 +00:00
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