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godoc: parallelize corpus init

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Massive win for high-latency network filesystems.
Also benefits the local disk/ssd case too, though.

R=golang-dev, bgarcia
CC=golang-dev
https://golang.org/cl/18650043
This commit is contained in:
Brad Fitzpatrick 2013-10-28 12:51:01 -07:00
parent e29626539b
commit 452c763fc7
1 changed files with 11 additions and 15 deletions
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26
godoc/dirtrees.go
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@ -73,13 +73,19 @@ func (b *treeBuilder) newDirTree(fset *token.FileSet, path, name string, depth i
list, _ := b.c.fs.ReadDir(path)
// determine number of subdirectories and if there are package files
ndirs := 0
hasPkgFiles := false
var dirchs []chan *Directory
var synopses [3]string // prioritized package documentation (0 == highest priority)
for _, d := range list {
switch {
case isPkgDir(d):
ndirs++
ch := make(chan *Directory, 1)
dirchs = append(dirchs, ch)
go func(d os.FileInfo) {
name := d.Name()
ch <- b.newDirTree(fset, pathpkg.Join(path, name), name, depth+1)
}(d)
case isPkgFile(d):
// looks like a package file, but may just be a file ending in ".go";
// don't just count it yet (otherwise we may end up with hasPkgFiles even
@ -112,21 +118,11 @@ func (b *treeBuilder) newDirTree(fset *token.FileSet, path, name string, depth i
// create subdirectory tree
var dirs []*Directory
if ndirs > 0 {
dirs = make([]*Directory, ndirs)
i := 0
for _, d := range list {
if isPkgDir(d) {
name := d.Name()
dd := b.newDirTree(fset, pathpkg.Join(path, name), name, depth+1)
if dd != nil {
dirs[i] = dd
i++
for _, ch := range dirchs {
if d := <-ch; d != nil {
dirs = append(dirs, d)
}
}
}
dirs = dirs[0:i]
}
// if there are no package files and no subdirectories
// containing package files, ignore the directory