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parser: Add BenchmarkFrontmatterTags

The list handling is surprisingly expensive:

```
▶ go test -run="NONE" -bench="BenchmarkFrontmatterTags" -test.benchmem=true ./parser | prettybench
PASS
benchmark                               iter         time/iter   bytes alloc           allocs
---------                               ----         ---------   -----------           ------
BenchmarkFrontmatterTags/JSON:1-4    1000000     2039.00 ns/op      912 B/op     20 allocs/op
BenchmarkFrontmatterTags/JSON:11-4    300000     5202.00 ns/op     1640 B/op     44 allocs/op
BenchmarkFrontmatterTags/JSON:21-4    200000     7993.00 ns/op     2392 B/op     65 allocs/op
BenchmarkFrontmatterTags/YAML:1-4     200000     9359.00 ns/op     5928 B/op     66 allocs/op
BenchmarkFrontmatterTags/YAML:11-4    100000    21218.00 ns/op     8408 B/op    140 allocs/op
BenchmarkFrontmatterTags/YAML:21-4     50000    32852.00 ns/op    10920 B/op    211 allocs/op
BenchmarkFrontmatterTags/TOML:1-4     100000    21505.00 ns/op     9231 B/op    173 allocs/op
BenchmarkFrontmatterTags/TOML:11-4     20000    82919.00 ns/op    19808 B/op    625 allocs/op
BenchmarkFrontmatterTags/TOML:21-4     10000   141847.00 ns/op    31200 B/op   1106 allocs/op
ok      github.com/spf13/hugo/parser    17.890s
```

See #3464
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bep committed Jun 3, 2017
1 parent 250ebc1 commit 3d9c4f513b0443648d7e88995e351df1739646d2
Showing with 70 additions and 0 deletions.
  1. +70 −0 parser/frontmatter_test.go
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@@ -15,7 +15,9 @@ package parser
import (
"bytes"
"fmt"
"reflect"
"strings"
"testing"
)
@@ -317,3 +319,71 @@ func TestRemoveTOMLIdentifier(t *testing.T) {
}
}
}
func BenchmarkFrontmatterTags(b *testing.B) {
for _, frontmatter := range []string{"JSON", "YAML", "TOML"} {
for i := 1; i < 30; i += 10 {
doBenchmarkFrontmatter(b, frontmatter, i)
}
}
}
func doBenchmarkFrontmatter(b *testing.B, fileformat string, numTags int) {
yamlTemplate := `---
name: "Tags"
tags:
%s
---
`
tomlTemplate := `+++
name = "Tags"
tags = %s
+++
`
jsonTemplate := `{
"name": "Tags",
"tags": [
%s
]
}`
name := fmt.Sprintf("%s:%d", fileformat, numTags)
b.Run(name, func(b *testing.B) {
tags := make([]string, numTags)
var (
tagsStr string
frontmatterTemplate string
)
for i := 0; i < numTags; i++ {
tags[i] = fmt.Sprintf("Hugo %d", i+1)
}
if fileformat == "TOML" {
frontmatterTemplate = tomlTemplate
tagsStr = strings.Replace(fmt.Sprintf("%q", tags), " ", ", ", -1)
} else if fileformat == "JSON" {
frontmatterTemplate = jsonTemplate
tagsStr = strings.Replace(fmt.Sprintf("%q", tags), " ", ", ", -1)
} else {
frontmatterTemplate = yamlTemplate
for _, tag := range tags {
tagsStr += "\n- " + tag
}
}
frontmatter := fmt.Sprintf(frontmatterTemplate, tagsStr)
p := page{frontmatter: []byte(frontmatter)}
b.ResetTimer()
for i := 0; i < b.N; i++ {
meta, err := p.Metadata()
if err != nil {
b.Fatal(err)
}
if meta == nil {
b.Fatal("Meta is nil")
}
}
})
}

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