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https://github.com/go-gitea/gitea.git
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d87d26d735
This pull request optimizes code diff highlighting in the PR Files Changed view, which is a major CPU bottleneck and hot path in production. Previously, Gitea executed the expensive `DiffMatchPatch` algorithm twice for every matching deleted/added line pair (once for the deleted line, and once for the added line). We now run the diff algorithm once and cache the resulting `DiffInline` on the `DiffLine` struct itself, allowing the second line to render via a 0-cost cache lookup. --------- Co-authored-by: wxiaoguang <wxiaoguang@gmail.com> Co-authored-by: silverwind <me@silverwind.io>
49 lines
1.3 KiB
Go
49 lines
1.3 KiB
Go
// Copyright 2026 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package highlight
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import (
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"strings"
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"testing"
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"github.com/alecthomas/chroma/v2/lexers"
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)
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func BenchmarkDetectChromaLexerByFileName(b *testing.B) {
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for b.Loop() {
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// BenchmarkDetectChromaLexerByFileName-12 18214717 61.35 ns/op
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DetectChromaLexerByFileName("a.sql", "")
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}
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}
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func BenchmarkDetectChromaLexerWithAnalyze(b *testing.B) {
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code := []byte(strings.Repeat("SELECT * FROM table;\n", 1000))
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b.ResetTimer()
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for b.Loop() {
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// BenchmarkRenderCodeSlowGuess-12 87946 13310 ns/op
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detectChromaLexerWithAnalyze("a", "", code)
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}
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}
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func BenchmarkChromaAnalyze(b *testing.B) {
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code := strings.Repeat("SELECT * FROM table;\n", 1000)
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b.ResetTimer()
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for b.Loop() {
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// comparing to detectChromaLexerWithAnalyze (go-enry), "chroma/lexers.Analyse" is very slow
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// BenchmarkChromaAnalyze-12 519 2247104 ns/op
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lexers.Analyse(code)
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}
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}
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func BenchmarkRenderCodeByLexer(b *testing.B) {
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code := strings.Repeat("SELECT * FROM table;\n", 1000)
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lexer := DetectChromaLexerByFileName("a.sql", "")
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b.ResetTimer()
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for b.Loop() {
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// HINT: CODE-HIGHLIGHT-PERFORMANCE: Really slow ....... the regexp2 used by Chroma takes most of the time
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// BenchmarkRenderCodeByLexer-12 22 47159038 ns/op
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RenderCodeByLexer(lexer, code)
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}
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}
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