Muir Manders f0be937dca internal/lsp: speed up deep completion search ... Optimize a few things to speed up deep completions: - item() is slow, so don't call it unless the candidate's name matches the input. - We only end up returning the top 3 deep candidates, so skip deep candidates early if they are not in the top 3 scores we have seen so far. This greatly reduces calls to item(), but also avoids a humongous sort in lsp/completion.go. - Get rid of error return value from found(). Nothing checked for this error, and we spent a lot of time allocating the only possible error "this candidate is not accessible", which is not unexpected to begin with. - Cache the call to types.NewMethodSet in methodsAndFields(). This is relatively expensive and can be called many times for the same type when searching for deep completions. - Avoid calling deepState.chainString() twice by calling it once and storing the result on the candidate. These optimizations sped up my slow completion from 1.5s to 0.5s. There were around 200k deep candidates examined for this one completion. The remaining time is dominated by the fuzzy matcher. Obviously 500ms is still unacceptable under any circumstances, so there will be subsequent improvements to limit the deep completion search scope to make sure we always return completions in a reasonable amount of time. I also made it so there is always a "matcher" set on the completer. This makes the matching logic a bit simpler. Change-Id: Id48ef7031ee1d4ea04515c828277384562b988a8 Reviewed-on: https://go-review.googlesource.com/c/tools/+/190522 Run-TryBot: Rebecca Stambler <rstambler@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Rebecca Stambler <rstambler@golang.org>		2019-08-20 18:51:39 +00:00
..
analysis.go	internal/lsp: label context cancellation errors	2019-08-15 23:24:24 +00:00
completion_format.go	internal/lsp: speed up deep completion search	2019-08-20 18:51:39 +00:00
completion_snippet.go	internal/lsp: provide deep completion candidates	2019-06-27 18:58:03 +00:00
completion.go	internal/lsp: speed up deep completion search	2019-08-20 18:51:39 +00:00
deep_completion.go	internal/lsp: speed up deep completion search	2019-08-20 18:51:39 +00:00
diagnostics_test.go	internal/span: change URI.Filename so it just returns the filename	2019-06-10 21:39:43 +00:00
diagnostics.go	internal/lsp: abstract the diff library so it can be substituted	2019-08-20 03:37:07 +00:00
enums.go	internal/lsp: switch completion item tests to using the enum strings	2019-04-17 17:57:43 +00:00
format.go	internal/lsp: abstract the diff library so it can be substituted	2019-08-20 03:37:07 +00:00
highlight.go	internal/lsp: split the telemetry library out	2019-08-15 21:28:02 +00:00
hover.go	internal/lsp: split the telemetry library out	2019-08-15 21:28:02 +00:00
identifier.go	internal/lsp: split the telemetry library out	2019-08-15 21:28:02 +00:00
imports_test.go	internal/lsp: abstract the diff library so it can be substituted	2019-08-20 03:37:07 +00:00
imports.go	internal/lsp: abstract the diff library so it can be substituted	2019-08-20 03:37:07 +00:00
references.go	internal/lsp: split the telemetry library out	2019-08-15 21:28:02 +00:00
rename_check.go	internal/lsp: use memoize package to cache source.Packages	2019-08-13 21:41:43 +00:00
rename.go	internal/lsp: abstract the diff library so it can be substituted	2019-08-20 03:37:07 +00:00
signature_help.go	internal/lsp: split the telemetry library out	2019-08-15 21:28:02 +00:00
source_test.go	internal/lsp: abstract the diff library so it can be substituted	2019-08-20 03:37:07 +00:00
suggested_fix.go	internal/lsp: abstract the diff library so it can be substituted	2019-08-20 03:37:07 +00:00
symbols.go	internal/lsp: split the telemetry library out	2019-08-15 21:28:02 +00:00
util.go	internal/lsp: show "do not edit" message when user opens generated file	2019-08-07 16:44:42 +00:00
view.go	internal/lsp: abstract the diff library so it can be substituted	2019-08-20 03:37:07 +00:00