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Improving performance of rav1d video decoder

(ohadravid.github.io)
305 points todsacerdoti | 1 comments | 22 May 25 11:59 UTC | HN request time: 0s | source
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lubesGordi ◴[22 May 25 13:44 UTC] No.44062002[source]▶
Honestly its a little surprising the first optimization he found was something fairly obvious just by using perf. I thought they had discussed the zeroing buffers issue in the first post? The second optimization was definitely more involved/interesting but was still pointed at by perf. Don't underestimate that tool!
replies(2): >>44062673 #>>44067686 #
1. Sesse__ ◴[22 May 25 22:09 UTC] No.44067686[source]▶
AFAICS, it wasn't “just perf”; it was doing a differential profile between the C and Rust versions, with manual matching up. (perf diff exists, but can't match across the differing symbol names, and few people seem to use it.)