// Start calculating and reporting statistics on the repo and tiles.
//
// We presume the git.Update(true) is called somewhere else, usually this is done
// in the trace/db.Builder, so the repo is always as good as the loaded tiles.
func Start(nanoTileStore *db.Builder, git *gitinfo.GitInfo) {
coverage := metrics.NewRegisteredGaugeFloat64("stats.tests.bench_runs_per_changelist", metrics.DefaultRegistry)
skpLatency := metrics.NewRegisteredTimer("stats.skp.update_latency", metrics.DefaultRegistry)
commits := metrics.NewRegisteredGauge("stats.commits.total", metrics.DefaultRegistry)
go func() {
for _ = range time.Tick(2 * time.Minute) {
tile := nanoTileStore.GetTile()
numCommits := tile.LastCommitIndex() + 1
numTraces := len(tile.Traces)
total := 0
for _, tr := range tile.Traces {
for i := 0; i < numCommits; i++ {
if !tr.IsMissing(i) {
total += 1
}
}
}
cov := float64(total) / float64(numCommits*numTraces)
glog.Info("Coverage: ", cov)
coverage.Update(cov)
last, err := git.LastSkpCommit()
if err != nil {
glog.Warning("Failed to read last SKP commit: %s", err)
continue
}
skpLatency.Update(time.Since(last))
commits.Update(int64(git.NumCommits()))
}
}()
}
