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When searching for deep completions, we can end up enumerating struct types' fields a lot. Optimize fieldSelections to reduce work: - Wait until we see an embedded field before we create the "seen" map. - Use a callback style to iterate over the struct's fields rather than returning a slice of fields. - Change "seen" checking strategy back to track struct types rather than each individual field. Struct with 5 non-embedded fields: name old time/op new time/op delta Fields-16 293ns ± 1% 20ns ± 2% -93.13% (p=0.008 n=5+5) name old alloc/op new alloc/op delta Fields-16 120B ± 0% 0B -100.00% (p=0.008 n=5+5) name old allocs/op new allocs/op delta Fields-16 4.00 ± 0% 0.00 -100.00% (p=0.008 n=5+5) Same struct but add an embedded struct with 2 fields: name old time/op new time/op delta Fields-16 389ns ± 1% 142ns ± 1% -63.53% (p=0.008 n=5+5) name old alloc/op new alloc/op delta Fields-16 120B ± 0% 144B ± 0% +20.00% (p=0.008 n=5+5) name old allocs/op new allocs/op delta Fields-16 4.00 ± 0% 2.00 ± 0% -50.00% (p=0.008 n=5+5) I think the alloc/op went up because the "seen" map is no longer allocated on the stack. There is more room for more optimization, but it's probably not worth making things more complicated. Change-Id: I6f9f2124334a8594ef9d6f9b5ac4b3a8aead5f49 Reviewed-on: https://go-review.googlesource.com/c/tools/+/223419 Run-TryBot: Muir Manders <muir@mnd.rs> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Rebecca Stambler <rstambler@golang.org> |
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