Reduce allocs while tiling.

Arvados-DCO-1.1-Signed-off-by: Tom Clegg <tom@tomclegg.ca>

diff --git a/tilelib.go b/tilelib.go
index cfe91fb49f5fccecd9f43d4d9770f03c57cb083d..fd8476b8d6d44e45421d5db6581e1a3dc3958a52 100644 (file)
--- a/tilelib.go
+++ b/tilelib.go
@@ -53,12 +53,13 @@ func (tilelib *tileLibrary) TileFasta(filelabel string, rdr io.Reader) (tileSeq,
                }
                todo <- jobT{seqlabel, fasta}
        }()
+       path := make([]tileLibRef, 2000000)
        for job := range todo {
                if len(job.fasta) == 0 {
                        continue
                }
                log.Printf("%s %s tiling", filelabel, job.label)
-               var path []tileLibRef
+               path = path[:0]
                tilestart := -1        // position in fasta of tile that ends here
                tiletagid := tagID(-1) // tag id starting tile that ends here
                tilelib.taglib.FindAll(job.fasta, func(id tagID, pos, taglen int) {
@@ -71,7 +72,9 @@ func (tilelib *tileLibrary) TileFasta(filelabel string, rdr io.Reader) (tileSeq,
                if tiletagid >= 0 {
                        path = append(path, tilelib.getRef(tiletagid, job.fasta[tilestart:]))
                }
-               ret[job.label] = path
+               pathcopy := make([]tileLibRef, len(path))
+               copy(pathcopy, path)
+               ret[job.label] = pathcopy
                log.Printf("%s %s tiled with path len %d", filelabel, job.label, len(path))
        }
        return ret, scanner.Err()